7 Del. Admin. Code § 1103-4.0

Current through Register Vol. 28, No. 1, July 1, 2024

Section 1103-4.0 - Sulfur Dioxide

4.1 The national primary 1-hour air quality standard for oxides of sulfur is 75 parts per billion (ppb) measured in the ambient air as sulfur dioxide. The 1-hour ambient air quality standard is met when the three-year average of the annual (99th percentile) of the daily maximum 1-hour average concentration is less than or equal to 75 ppb.

4.1.1 Compliance with the national primary 1-hour air quality standard is determined in accordance with 40 CFR Part 50 Appendix T, Interpretation of the Primary National Ambient Air Quality Standards for Oxides of Sulfur (Sulfur Dioxide), July 1, 2019.

4.1.2 The national primary 1-hour air quality standard for oxides of sulfur is set forth in 40 CFR Part 50.17, National Primary Ambient Air Quality Standards for Sulfur Oxides (Sulfur Dioxide), July 1, 2019.

4.2 Reserved.

4.3 Reserved.

4.4 The national secondary 3-hour ambient air quality standard for sulfur oxides is 0.5 parts per million (ppm), not to be exceeded more than once per calendar year.

4.4.1 Compliance with the national secondary 3-hour ambient air quality standard for oxides of sulfur is determined in accordance with 40 CFR Part 50, Appendix A-1, Reference Method Principle and Calibration Procedure for the Measurement of Sulfur Dioxide in the Atmosphere (Ultraviolet Fluorescence Method), July 1, 2019, or 40 CFR, Part 50, Appendix A-2, Reference Method for the Measurement of Sulfur Dioxide in the Atmosphere (Pararosaniline Method), July 1, 2019.

4.4.2 The national secondary 3-hour ambient air quality standard for sulfur oxides is set forth in 40 CFR Part 50.5, National Secondary Ambient Air Quality Standard for Sulfur Oxides (Sulfur Dioxide), July 1, 2019.

[08/11/22]

7 Del. Admin. Code § 1103-4.0

17 DE Reg. 741 (1/1/2014)
26 DE Reg. 120 (8/1/2022) (Final)