7 Del. Admin. Code § 1103-11.0

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

Section 1103-11.0 - PM[10] and PM[2.5] Particulates

11.1 The Primary and Secondary Ambient Air Quality Standards for Particulate Matter, measured as PM₁₀ are:

11.1.1 The primary and secondary air quality standards for PM₁₀ are 150 micrograms per cubic meter (µg/m³), 24 hour average concentration. The standards are attained when the expected number of days per calendar year with a 24-hour average concentration above 150 µg/m³, as determined in accordance with 40 CFR, Part 50, Appendix K, Interpretation of the National Ambient Air Quality Standards for Particulate Matter, July 1, 2019, is equal to or less than one. The national primary and secondary air quality standards are set forth in 40 CFR Part 50.6, National Primary and Secondary Ambient Air Quality Standards for PM₁₀, July 1, 2019.

11.1.2 Reserved

11.2 The Primary and Secondary Ambient Air Quality Standards for Particulate Matter, measured as PM_2.5 are:

11.2.1 The 24-hour primary and secondary air quality standard is 35 micrograms per cubic meter (µg/m³) 24-hour average concentration. The 24-hour primary and secondary PM_2.5 standards are met when the 98th percentile 24-hour concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, Interpretation of the National Ambient Air Quality Standards for PM_2.5, July 1, 2019, is less than or equal to 35 µg/m³. The national 24-hour hour primary and secondary air quality standards are set forth in 40 CFR Part 50.13, National Primary and Secondary Air Quality Standards for PM_2.5, July 1, 2019.

11.2.2 The primary annual air quality standard is 12.0 micrograms per cubic meter (mg/m³) annual arithmetic mean concentration. The annual primary PM_2.5 standards are met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, Interpretation of the National Ambient Air Quality Standards for PM_2.5, July 1, 2019, is less than or equal to 12.0 µg/m³. The national annual primary and secondary air quality standards are set forth in 40 CFR Part 50.18, National Primary and Secondary Air Quality Standards for PM_2.5, July 1, 2019.

11.2.3 The secondary annual air quality standard is 15.0 micrograms per cubic meter (µg/m³) annual arithmetic mean concentration. The annual secondary PM_2.5 standards are met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR, Part 50, Appendix N, Interpretation of the National Ambient Air Quality Standards for PM_2.5, July 1, 2019, is less than or equal to 15.0 µg/m³. The national annual primary and secondary air quality standards are set forth in 40 CFR Part 50.13, National Primary and Secondary Air Quality Standards for PM_2.5, July 1, 2019.

7 Del. Admin. Code § 1103-11.0

3 DE Reg. 778 (12/01/99)
6 DE Reg. 968 (02/01/03)
12 DE Reg. 347 (09/01/08)
17 DE Reg. 741 (1/1/2014)
26 DE Reg. 120 (8/1/2022) (Final)