Utah Admin. Code 307-105-1

Current through Bulletin No. 2024-21, November 1, 2024

Section R307-105-1 - Air Pollution Emergency Episodes

(1) Determination of an episode and its extent or stage shall be made by the director taking into consideration the levels of pollutant concentrations contained at 40 CFR Section 51.151 and 40 CFR Section 51, Appendix L, and summarized in the table below:

TABLE AIR POLLUTION EPISODE CRITERIA (values in micrograms/cubic meter unless stated otherwise)
POLLUTANT	ALERT	WARNING	EMERGENCY	NEVER TO BE EXCEEDED
SULFUR DIOXIDE	800	1,600	2,100	2,620
24-hour average	(0.3 ppm)	(0.6 ppm)	(0.8 ppm)	(1.0 ppm)
PM10	3 50	420	500	600
24-hour average
CARBON MONOXIDE
8-hour average	17,000 ( 15 ppm)	34,000 30 ppm)	46,000 (40 ppm)	57,500 (50 ppm)
4-hour average				86, 300 (75 ppm)
1-hour average				144 ,000 (125 ppm)
OZONE
1-hour average	400 ( 0.2 ppm)	800 (0.4 ppm)	1,000 (0.5 ppm)
2-hour average				1, 2 00 (0 . 6 ppm)
NITROGEN DIOXID	E 1130	2,260	3,000	3,750
1-hour average	(0.6 ppm)	(1.2 ppm)	(1.6 ppm)	(2.0 ppm)
NITROGEN DIOXID	E 282	565	750	938
24-hour average	(0.15 ppm)	(0.3 ppm)	(0.4 ppm)	(0.5 ppm)

An air pollution alert, air pollution warning, or air pollution emergency will be declared when any one of the above pollutants reaches the specified levels at any monitoring site.

In addition to the levels listed for the above pollutants, meteorological conditions are such that pollutant concentrations can be expected to remain at the above levels for twelve (12) or more hours or increase, or in the case of ozone, the situation is likely to reoccur within the next 24-hours unless control actions are taken.

ALERT The Alert level is that concentration at which first stage control action is to begin.

WARNING The warning level indicates that air quality is continuing to degrade and that additional control actions are necessary.

EMERGENCY The emergency level indicates that air quality is continuing to degrade toward a level of significant harm to the health of persons and that the most stringent control actions are necessary.

(2) The director shall also take into consideration, to determine an episode and its extent, rate of change of concentration, meteorological forecasts, and the geographical area of the episode, including a consideration of point and area sources of emission, where applicable.

Utah Admin. Code R307-105-1