(1)Definitions. For the purpose of nonattainment new source review, the following definitions shall apply: "Act" means the Clean Air Act, 42 U.S.C. Sections 7401, et seq., as amended through November 15, 1990.
"Actual emissions" means:
1. The actual rate of emissions of a regulated NSR pollutant from an emissions unit, as determined in accordance with paragraphs "2" through "4," except that this definition shall not apply for calculating whether a significant emissions increase has occurred, or for establishing a PAL under rule 567-319. (455B). Instead, the definitions of projected actual emission and baseline actual emissions shall apply for those purposes.2. In general, actual emissions as of a particular date shall equal the average rate, in tons per year, at which the unit actually emitted the pollutant during a consecutive 24-month period which precedes the particular date and which is representative of normal source operation. The department shall allow the use of a different time period upon a determination that it is more representative of normal source operation. Actual emissions shall be calculated using the unit's actual operating hours, production rates, and types of materials processed, stored, or combusted during the selected time period.3. The department may presume that source-specific allowable emissions for the unit are equivalent to the actual emissions of the unit.4. For any emissions unit that has not begun normal operations on the particular date, actual emissions shall equal the potential to emit of the unit on that date. 1. The applicable standards as set forth in 567-subrules 23.1(2) through 23.1(5) (new source performance standards, emissions standards for hazardous air pollutants, and federal emissions guidelines) or an applicable federal standard not adopted by the state, as set forth in 40 CFR Parts 60, 61 and 63;2. The state implementation plan (SIP) emissions limitation, including those with a future compliance date; or3. The emissions rate specified as an enforceable permit condition, including those with a future compliance date."Baseline actual emissions, " for the purposes of this rule, means the rate of emissions, in tons per year, of a regulated NSR pollutant, as determined in accordance with paragraphs "1" through "4."
1. For any existing electric utility steam generating unit, baseline actual emissions means the average rate, in tons per year, at which the unit actually emitted the pollutant during any consecutive 24-month period selected by the owner or operator within the five-year period immediately preceding when the owner or operator begins actual construction of the project. The department shall allow the use of a different time period upon a determination that it is more representative of normal source operation. (a) The average rate shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions.(b) The average rate shall be adjusted downward to exclude any non-compliant emissions that occurred while the source was operating above an emissions limitation that was legally enforceable during the consecutive 24-month period.(c) For a regulated NSR pollutant, when a project involves multiple emissions units, only one consecutive 24-month period must be used to determine the baseline actual emissions for the emissions units being changed. A different consecutive 24-month period can be used for each regulated NSR pollutant.(d) The average rate shall not be based on any consecutive 24-month period for which there is inadequate information for determining annual emissions, in tons per year, and for adjusting this amount if required by paragraph "l"(b) of this definition.2. For an existing emissions unit (other than an electric utility steam generating unit), baseline actual emissions means the average rate, in tons per year, at which the emissions unit actually emitted the pollutant during any consecutive 24-month period selected by the owner or operator within the ten-year period immediately preceding either the date the owner or operator begins actual construction of the project, or the date on which a complete permit application is received by the department for a permit required either under this rule or under a plan approved by the Administrator, whichever is earlier, except that the ten-year period shall not include any period earlier than November 15, 1990.(a) The average rate shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions.(b) The average rate shall be adjusted downward to exclude any non-compliant emissions that occurred while the source was operating above an emission limitation that was legally enforceable during the consecutive 24-month period.(c) The average rate shall be adjusted downward to exclude any emissions that would have exceeded an emission limitation with which the major stationary source must currently comply, had such major stationary source been required to comply with such limitations during the consecutive 24-month period. However, if an emission limitation is part of a maximum achievable control technology standard that the Administrator proposed or promulgated under 40 CFR Part 63, the baseline actual emissions need only be adjusted if the state has taken credit for such emissions reductions in an attainment demonstration or maintenance plan consistent with the requirements of subparagraph 31.3(3)"b "(7).(d) For a regulated NSR pollutant, when a project involves multiple emissions units, only one consecutive 24-month period must be used to determine the baseline actual emissions for the emissions units being changed. A different consecutive 24-month period can be used for each regulated NSR pollutant.(e) The average rate shall not be based on any consecutive 24-month period for which there is inadequate information for determining annual emissions, in tons per year, and for adjusting this amount if required by paragraphs "2"(b) and "2"(c) of this definition.3. For a new emissions unit, the baseline actual emissions for purposes of determining the emissions increase that will result from the initial construction and operation of such unit shall equal zero; and thereafter, for all other purposes, shall equal the unit's potential to emit.4. For a PAL for a major stationary source, the baseline actual emissions shall be calculated for existing electric utility steam generating units in accordance with the procedures contained in paragraph "1," for other existing emissions units in accordance with the procedures contained in paragraph "2," and for a new emissions unit in accordance with the procedures contained in paragraph "3.""Begin actual construction " means, in general, initiation of physical on-site construction activities on an emissions unit which are of a permanent nature. Such activities include, but are not limited to, installation of building supports and foundations, laying of underground pipework, and construction of permanent storage structures. With respect to a change in method of operating this term refers to those on-site activities other than preparatory activities which mark the initiation of the change.
"Best available control technology" or"BACT" means an emissions limitation, including a visible emissions standard, based on the maximum degree of reduction for each regulated NSR pollutant which would be emitted from any proposed major stationary source or major modification which the department, on a case-by-case basis, taking into account energy, environmental, and economic impacts and other costs, determines is achievable for such source or modification through application of production processes or available methods, systems, and techniques, including fuel cleaning or treatment or innovative fuel combustion techniques for control of such pollutant. In no event shall application of best available control technology result in emissions of any pollutant which would exceed the emissions allowed by any applicable standard under 567-subrules 23.1(2) through 23.1(5) (standards for new stationary sources, federal standards for hazardous air pollutants, and federal emissions guidelines), or federal regulations as set forth in 40 CFR Parts 60, 61 and 63 but not yet adopted by the state. If the department determines that technological or economic limitations on the application of measurement methodology to a particular emissions unit would make the imposition of an emissions standard infeasible, a design, equipment, work practice, operational standard, or combination thereof, may be prescribed instead to satisfy the requirement for the application of BACT. Such standard shall, to the degree possible, set forth the emissions reduction achievable by implementation of such design, equipment, work practice or operation, and shall provide for compliance by means which achieve equivalent results.
"Building, structure, facility, or installation " means all of the pollutant-emitting activities which belong to the same industrial grouping, are located on one or more contiguous or adjacent properties, and are under the control of the same person (or persons under common control) except the activities of any vessel. Pollutant-emitting activities shall be considered as part of the same industrial grouping if they belong to the same major group (i.e., which have the same two-digit code) as described in the Standard Industrial Classification Manual, 1972, as amended by the 1977 Supplement (U.S. Government Printing Office stock numbers 4101-0065 and 003-005-00176-0, respectively).
"CFR " means the Code of Federal Regulations, with standard references in this chapter by title and part, so that " 40 CFR 51 " or " 40 CFR Part 51 " means "Title 40 Code of Federal Regulations, Part 51."
"Clean coal technology" means any technology, including technologies applied at the precombustion, combustion, or post combustion stage, at a new or existing facility which will achieve significant reductions in air emissions of sulfur dioxide or oxides of nitrogen associated with the utilization of coal in the generation of electricity, or process steam which was not in widespread use as of November 15, 1990.
"Clean coal technology demonstration project" means a project using funds appropriated under the heading "Department of Energy-Clean Coal Technology," up to a total amount of $2,500,000,000 for commercial demonstration of clean coal technology, or similar projects funded through appropriations for the EPA. The federal contribution for a qualifying project shall be at least 20 percent of the total cost of the demonstration project.
"Commence, " as applied to construction of a major stationary source or major modification, means that the owner or operator has all necessary preconstruction approvals or permits and either has:
1. Begun, or caused to begin, a continuous program of actual on-site construction of the source, to be completed within a reasonable time; or2. Entered into binding agreements or contractual obligations, which cannot be canceled or modified without substantial loss to the owner or operator, to undertake a program of actual construction of the source to be completed within a reasonable time."Construction" means any physical change or change in the method of operation, including fabrication, erection, installation, demolition, or modification of an emissions unit, that would result in a change in emissions.
"Continuous emissions monitoring system" or"CEMS" means all of the equipment that may be required to meet the data acquisition and availability requirements of this rule, to sample, to condition (if applicable), to analyze, and to provide a record of emissions on a continuous basis.
"Continuous emissions rate monitoring system" or"CERMS" means the total equipment required for the determination and recording of the pollutant mass emissions rate (in terms of mass per unit of time).
"Continuous parameter monitoring system" or"CPMS" means all of the equipment necessary to meet the data acquisition and availability requirements of this rule, to monitor process and control device operational parameters (for example, control device secondary voltages and electric currents) and other information (for example, gas flow rate, O2 or CO2 concentrations), and to record average operational parameter value(s) on a continuous basis.
"Electric utility steam generating unit" means any steam electric generating unit that is constructed for the purpose of supplying more than one-third of its potential electric output capacity and more than 25 MW electrical output to any utility power distribution system for sale. Any steam supplied to a steam distribution system for the purpose of providing steam to a steam-electric generator that would produce electrical energy for sale is also considered in determining the electrical energy output capacity of the affected facility.
"Emissions unit" means any part of a stationary source that emits or would have the potential to emit any regulated NSR pollutant and includes an electric steam generating unit. For purposes of this rule, there are two types of emissions units as described in paragraphs "1" and "2."
1. A new emissions unit is any emissions unit which is (or will be) newly constructed and which has existed for less than two years from the date such emissions unit first operated.2. An existing emissions unit is any emissions unit that does not meet the requirements in paragraph "1" of this definition. A replacement unit is an existing emissions unit."Federal land manager " means, with respect to any lands in the United States, the secretary of the department with authority over such lands.
"Federally enforceable" means all limitations and conditions which are enforceable by the Administrator and the department, including those federal requirements not yet adopted by the state, developed pursuant to 40 CFR Parts 60, 61, and 63; requirements within 567-subrules 23.1(2) through 23.1(5); requirements within the SIP; any permit requirements established pursuant to 40 CFR 5221. or under regulations approved pursuant to 40 CFR Part 51, Subpart I, as amended through October 20, 2010, including operating permits issued under an EPA-approved program that is incorporated into the SIP and expressly requires adherence to any permit issued under such program.
"Fugitive emissions" means those emissions which could not reasonably pass through a stack, chimney, vent or other functionally equivalent opening.
"Lowest achievable emission rate " or"LAER " means, for any source, the more stringent rate of emissions based on the following:
1. The most stringent emissions limitation which is contained in the implementation plan of any state for such class or category of stationary source, unless the owner or operator of the proposed stationary source demonstrates that such limitations are not achievable; or2. The most stringent emissions limitation which is achieved in practice by such class or category of stationary sources. This limitation, when applied to a modification, means the lowest achievable emissions rate for the new or modified emissions units within or stationary source. In no event shall the application of the term permit a proposed new or modified stationary source to emit any pollutant in excess of the amount allowable under an applicable new source standard of performance. 1. Any significant emissions increase from any emissions units or net emissions increase at a major stationary source that is significant for volatile organic compounds shall be considered significant for ozone.2. A physical change or change in the method of operation shall not include: (a) Routine maintenance, repair and replacement;(b) Use of an alternative fuel or raw material by reason of an order under Sections 2(a) and (b) of the Energy Supply and Environmental Coordination Act of 1974 (or any superseding legislation) or by reason of a natural gas curtailment plan pursuant to the Federal Power Act;(c) Use of an alternative fuel by reason of an order or rule Section 125 of the Act;(d) Use of an alternative fuel at a steam generating unit to the extent that the fuel is generated from municipal solid waste;(e) Use of an alternative fuel or raw material by a stationary source which the source was capable of accommodating before December 21,1976, unless such change would be prohibited under any federally enforceable permit condition which was established after December 12,1976, pursuant to 40 CFR 5221. or under regulations approved pursuant to 40 CFR Subpart I or § 51.166; or the source is approved to use under any permit issued under regulations approved pursuant to this rule;(f) An increase in the hours of operation or in the production rate, unless such change is prohibited under any federally enforceable permit condition which was established after December 21, 1976, pursuant to 40 CFR 5221. or regulations approved pursuant to 40 CFR Part 51, Subpart I, or 40 CFR 51166..(g) Any change in ownership at a stationary source.(i) The installation, operation, cessation, or removal of a temporary clean coal technology demonstration project, provided that the project complies with the SIP, and other requirements necessary to attain and maintain the national ambient air quality standard during the project and after it is terminated.3. This definition shall not apply with respect to a particular regulated NSR pollutant when the major stationary source is complying with the requirements under rule 567-319. (455B) of this chapter for a PAL for that pollutant. Instead, the definition at 567-319. (455B) shall apply.4. For the purpose of applying the requirements of subrule 31.3(8) to modifications at major stationary sources of nitrogen oxides located in ozone nonattainment areas or in ozone transport regions, whether or not subject to Subpart 2, Part D, Title I of the Act, any significant net emissions increase of nitrogen oxides is considered significant for ozone.5. Any physical change in, or change in the method of operation of, a major stationary source of volatile organic compounds that results in any increase in emissions of volatile organic compounds from any discrete operation, emissions unit, or other pollutant emitting activity at the source shall be considered a significant net emissions increase and a major modification for ozone, if the major stationary source is located in an extreme ozone nonattainment area that is subject to Subpart 2, Part D, Title I of the Act. 1. Any stationary source of air pollutants that emits, or has the potential to emit, 100 tons per year or more of any regulated NSR pollutant, except that lower emissions thresholds shall apply in areas subject to Subpart 2, Subpart 3, or Subpart 4 of Part D, Title I of the Act, according to definitions in 31.3(1). (a) 50 tons per year of volatile organic compounds in any serious ozone nonattainment area.(b) 50 tons per year of volatile organic compounds in an area within an ozone transport region, except for any severe or extreme ozone nonattainment area.(c) 25 tons per year of volatile organic compounds in any severe ozone nonattainment area.(d) 10 tons per year of volatile organic compounds in any extreme ozone nonattainment area.(e) 50 tons per year of carbon monoxide in any serious nonattainment area for carbon monoxide, where stationary sources contribute significantly to carbon monoxide levels in the area (as determined under rules issued by the Administrator as amended through [effective date of these rules]).(f) 70 tons per year of PM10in any serious nonattainment area for PM10;2. For the purposes of applying the requirements of subrule 31.3(8) to stationary sources of nitrogen oxides located in an ozone nonattainment area or in an ozone transport region, any stationary source which emits, or has the potential to emit, 100 tons per year or more of nitrogen oxides emissions, except that the following emission thresholds apply in areas subject to Subpart 2 of Part D, Title I of the Act: (a) 100 tons per year or more of nitrogen oxides in any ozone nonattainment area classified as marginal or moderate.(b) 100 tons per year or more of nitrogen oxides in any ozone nonattainment area classified as a transitional, submarginal, or incomplete or no data area, when such area is located in an ozone transport region.(c) 100 tons per year or more of nitrogen oxides in any area designated under Section 107(d) of the Act as attainment or unclassifiable for ozone that is located in an ozone transport region.(d) 50 tons per year or more of nitrogen oxides in any serious nonattainment area for ozone.(e) 25 tons per year or more of nitrogen oxides in any severe nonattainment area for ozone.(f) 10 tons per year or more of nitrogen oxides in any extreme nonattainment area for ozone; or3. Any physical change that would occur at a stationary source not qualifying under subrule 31.3(1) as a major stationary source, if the change would constitute a major stationary source by itself.4. A major stationary source that is major for volatile organic compounds shall be considered major for ozone.5. The fugitive emissions of a stationary source shall not be included in determining for any of the purposes of this rule whether it is a major stationary source, unless the source belongs to one of the following categories of stationary sources: coal cleaning plants (with thermal dryers); kraft pulp mills; Portland cement plants; primary zinc smelters; iron and steel mills; primary aluminum ore reduction plants; primary copper smelters; municipal incinerators capable of charging more than 250 tons of refuse per day; hydrofluoric, sulfuric, or nitric acid plants; petroleum refineries; lime plants; phosphate rock processing plants; coke oven batteries; sulfur recovery plants; carbon black plants (furnace process); primary lead smelters; fuel conversion plants; sintering plants; secondary metal production plants; chemical process plants-The term chemical processing plant shall not include ethanol production facilities that produce ethanol by natural fermentation included in NAICS codes 325193 or 312140; fossil-fuel boilers (or combination thereof) totaling more than 250 million British thermal units per hour heat input; petroleum storage and transfer units with a total storage capacity exceeding 300,000 barrels; taconite ore processing plants; glass fiber processing plants; charcoal production plants; fossil fuel-fired steam electric plants of more than 250 million British thermal units per hour heat input; and any other stationary source category which, as of August 7, 1980, is being regulated under Section 111 or 112 of the Act."Necessary preconstruction approvals or permits " means those permits or approvals required under federal air quality control laws and regulations and those air quality control laws and regulations which are part of the SIP.
"Net emissions increase" means, with respect to any regulated NSR pollutant emitted by a major stationary source, the amount by which the sum of the following exceeds zero: the increase in emissions from a particular physical change or change in the method of operation at a stationary source as calculated according to the applicability requirements of paragraph 31.3(2)"b, " and any other increases and decreases in actual emissions at the major stationary source that are contemporaneous with the particular change and are otherwise creditable. Baseline actual emissions for calculating increases and decreases shall be determined as provided in the "baseline actual emissions" definition, except that paragraphs "1"(c) and "2"(d) shall not apply.
1. An increase or decrease in actual emissions is contemporaneous with the increase from the particular change only if the increase or decrease in actual emissions occurs between the date five years before construction on the particular change commences and the date that the increase from the particular change occurs;2. An increase or decrease in actual emissions is creditable only if: (a) The increase or decrease in actual emissions occurs within the contemporaneous time period, as noted in paragraph "1" of this definition; and(b) The department has not relied on the increase or decrease in actual emissions in issuing a permit for the source under this rule, which permit is in effect when the increase in actual emissions from the particular change occurs; and3. An increase in actual emissions is creditable only to the extent that the new level of actual emissions exceeds the old level.4. A decrease in actual emissions is creditable only to the extent that: (a) The old level of actual emission or the old level of allowable emissions whichever is lower, exceeds the new level of actual emissions;(b) It is enforceable as a practical matter at and after the time that actual construction on the particular change begins; and(c) The department has not relied on a decrease in actual emissions in issuing any permit under regulations approved pursuant to 40 CFR Part 51, Subpart I, or has not relied on a decrease in actual emissions in demonstrating attainment or reasonable further progress;(d) The decrease in actual emissions has approximately the same qualitative significance for public health and welfare as that attributed to the increase from the particular change; and5. An increase that results from a physical change at a source occurs when the emissions unit on which construction occurred becomes operational and begins to emit a particular pollutant. Any replacement unit that requires shakedown becomes operational only after a reasonable shakedown period, not to exceed 180 days.6. Actual emissions shall not apply for determining creditable increases and decreases or after a change."Nonattainment major new source review (NSR) program " means a major source preconstruction permit program that has been approved by the Administrator and incorporated into the plan to implement the requirements of this rule, or a program that implements 40 CFR Part 51, Appendix S, Sections I through VI, as amended on October 25, 2012. Any permit issued under such a program is a major NSR permit.
"Pollution prevention " means any activity that through process changes, product reformulation or redesign, or substitution of less polluting raw materials, eliminates or reduces the release of air pollutants (including fugitive emissions) and other pollutants to the environment prior to recycling, treatment, or disposal. "Pollution prevention" does not mean recycling (other than certain "in-process recycling" practices), energy recovery, treatment, or disposal.
"Potential to emit" means the maximum capacity of a stationary source to emit a pollutant under its physical and operational design. Any physical or operational limitation on the capacity of the source to emit a pollutant, including air pollution control equipment and restrictions on hours of operation or on the type or amount of material combusted, stored, or processed, shall be treated as part of its design only if the limitation or the effect it would have on emissions is federally enforceable. Secondary emissions do not count in determining the potential to emit of a stationary source.
"Predictive emissions monitoring system" or"PEMS" means all of the equipment necessary to monitor process and control device operational parameters (for example, control device secondary voltages and electric currents) and other information (for example, gas flow rate, O2 or CO2 concentrations), and calculate and record the mass emissions rate (for example, lb/hr) on a continuous basis.
"Prevention of significant deterioration (PSD) permit" means any permit that is issued under a major source preconstruction permit program that has been approved by the Administrator and incorporated into the plan to implement the requirements of 40 CFR 51166., or under the program in 40 CFR 5221..
"Project" means a physical change in, or change in the method of operation of, an existing major stationary source.
"Projected actual emissions " means the maximum annual rate, in tons per year, at which an existing emissions unit is projected to emit a regulated NSR pollutant in any one of the five years (12-month period) following the date the unit resumes regular operation after the project, or in any one of the ten years following that date, if the project involves increasing the emissions unit's design capacity or its potential to emit of that regulated NSR pollutant and full utilization of the unit would result in a significant emissions increase or a significant net emissions increase at the major stationary source. In determining the projected actual emissions before beginning actual construction, the owner or operator of the major stationary source:
1. Shall consider all relevant information including, but not limited to, historical operational data, the company's own representations, the company's expected business activity and the company's highest projections of business activity, the company's filings with the state or federal regulatory authorities, and compliance plans under the approved plan; and2. Shall include fugitive emissions to the extent quantifiable, and emissions associated with startups, shutdowns, and malfunctions; and3. Shall exclude, in calculating any increase in emissions that results from the particular project, that portion of the unit's emissions following the project that an existing unit could have accommodated during the consecutive 24-month period used to establish the baseline actual emissions and that are also unrelated to the particular project, including any increased utilization due to product demand growth; or4. In lieu of using the method set out in paragraphs "1" through "3," may elect to use the emissions unit's potential to emit, in tons per year. 1. Nitrogen oxides or any volatile organic compounds;2. Any pollutant for which a national ambient air quality standard has been promulgated;3. Any pollutant that is identified as a constituent or precursor of a general pollutant listed under paragraph "1" or "2," provided that such constituent or precursor pollutant may only be regulated under NSR as part of regulation of the general pollutant. Precursors identified by the Administrator for purposes of NSR are the following: (a) Volatile organic compounds and nitrogen oxides are precursors to ozone in all ozone nonattainment areas.(b) Sulfur dioxide is a precursor to PM2.5 in all PM2.5 nonattainment areas.(c) Nitrogen oxides are presumed to be precursors to PM2.5 in all PM2.5 nonattainment areas, unless the department demonstrates to the EPA's satisfaction or EPA demonstrates that emissions of nitrogen oxides from sources in a specific area are not a significant contributor to the area's ambient PM2.5concentrations.(d) Volatile organic compounds and ammonia are presumed not to be precursors to PM2.5in any PM2.5nonattainment area, unless the department demonstrates to the EPA's satisfaction or EPA demonstrates that emissions of volatile organic compounds or ammonia from sources in a specific area are a significant contributor to that area's ambient PM2.5concentrations; or4. PM2.5emissions and PM10emissions shall include gaseous emissions from a source or activity which condense to form particulate matter at ambient temperatures. "Replacement unit" means an emissions unit for which all the criteria listed in paragraphs "1" through "4" of this definition are met. No creditable emission reductions shall be generated from shutting down the existing emissions unit that is replaced.
1. The emissions unit is a reconstructed unit within the meaning of 40 CFR 6015(b)(1). as amended through December 16, 1975, or the emissions unit completely takes the place of an existing emissions unit.2. The emissions unit is identical to or functionally equivalent to the replaced emissions unit.3. The replacement does not alter the basic design parameters of the process unit.4. The replaced emissions unit is permanently removed from the major stationary source, otherwise permanently disabled, or permanently barred from operation by a permit that is enforceable as a practical matter. If the replaced emissions unit is brought back into operation, it shall constitute a new emissions unit. 1. In reference to a net emissions increase or the potential of a source to emit any of the following pollutants, a rate of emissions that would equal or exceed any of the following rates: Pollutant Emission Rate
(a) Carbon monoxide: 100 tons per year (tpy)(b) Nitrogen oxides: 40 tpy(c) Sulfur dioxide: 40 tpy(d) Ozone: 40 tpy of volatile organic compounds or nitrogen oxides(g) PM2.5: 10 tpy of direct PM2.5 emissions; 40 tpy of sulfur dioxide emissions; 40 tpy of nitrogen oxide emissions unless the department demonstrates to EPA's satisfaction that the emissions of nitrogen oxides from sources in a specific area are not a significant contributor to the area's ambient PM2.5 concentrations.2. Notwithstanding the significant emissions rate for ozone, significant means, in reference to an emissions increase or a net emissions increase, any increase in actual emissions of volatile organic compounds that would result from any physical change in, or change in the method of operation of, a major stationary source locating in a serious or severe ozone nonattainment area that is subject to Subpart 2, Part D, Title I of the Act, if such emissions increase of volatile organic compounds exceeds 25 tons per year.3. For the purposes of applying the requirements of subrule 31.3(8) to modifications at major stationary sources of nitrogen oxides located in an ozone nonattainment area or in an ozone transport region, the significant emission rates and other requirements for volatile organic compounds in paragraphs "1," "2," and "5" shall apply to nitrogen oxides emissions.4. Notwithstanding the significant emissions rate for carbon monoxide, significant means, in reference to an emissions increase or a net emissions increase, any increase in actual emissions of carbon monoxide that would result from any physical change in, or change in the method of operation of, a major stationary source in a serious nonattainment area for carbon monoxide if such increase equals or exceeds 50 tons per year, provided the department has determined that stationary sources contribute significantly to carbon monoxide levels in that area.5. Notwithstanding the significant emissions rates for ozone under paragraphs "1" and "2," any increase in actual emissions of volatile organic compounds from any emissions unit at a major stationary source of volatile organic compounds located in an extreme ozone nonattainment area that is subject to Subpart 2, Part D, Title I of the Act shall be considered a significant net emissions increase.