Ariz. Admin. Code § R18-2-201 - Particulate Matter: PM [10] and PM [2.5]

A. PM₁₀ Standards

1. The level of the primary and secondary ambient air quality standards for PM₁₀ is 150 micrograms per cubic meter of PM₁₀ - 24hour average concentration.

2. To determine attainment of the primary and secondary standards, a person shall measure PM₁₀ in the ambient air by:

a. A reference method based on 40 CFR 50, Appendix J, and designated according to 40 CFR 53 ; or

b. An equivalent method designated according to 40 CFR 53.

3. The primary and secondary 24-hour ambient air quality standards for PM₁₀ are attained when the expected number of days per calendar year with a 24-hour average concentration above 150 micrograms per cubic meter, determined according to 40 CFR 50, Appendix K, is less than or equal to one.

B. PM_2.5 Standards

1. The primary ambient air quality standards for PM_2.5 are:

a. 12 micrograms per cubic meter of PM_2.5 - annual arithmetic mean concentration.

b. 35 micrograms per cubic meter of PM_2.5 - 24-hour average concentration.

2. The secondary ambient air quality standards for PM_2.5 are:

a. 15 micrograms per cubic meter of PM_2.5 - annual arithmetic mean concentration.

b. 35 micrograms per cubic meter of PM_2.5 - 24-hour average concentration.

3. To determine attainment of the primary and secondary standards, a person shall measure PM_2.5 in the ambient air by:

a. A reference method based on 40 CFR 50, Appendix L, and designated according to 40 CFR 53 ; or

b. An equivalent method designated according to 40 CFR 53.

4. The primary annual ambient air quality standard for PM_2.5 is met when the annual arithmetic mean concentration, determined according to 40 CFR 50, Appendix N, is less than or equal to 12 micrograms per cubic meter.

5. The secondary annual ambient air quality standard for PM_2.5 is met when the annual arithmetic mean concentration, determined according to 40 CFR 50, Appendix N, is less than or equal to 15 micrograms per cubic meter.

5 6. The primary and secondary 24-hour ambient air quality standards for PM_2.5 are met when the 98th percentile 24-hour concentration, determined according to 40 CFR 50, Appendix N, is less than or equal to 35 micrograms per cubic meter.

Notes

Ariz. Admin. Code § R18-2-201

Amended effective December 22, 1976 (Supp. 76-5). Former Section R9-3-201 repealed, new Section R9-3-201 adopted effective May 14, 1979 (Supp. 79-1). Amended effective October 2, 1979 (Supp. 79-5). Editorial correction, subsection (E) (Supp. 80-2). Amended effective August 29, 1980 (Supp. 80-4). Amended subsection(B)(1) and deleted subsections (C) through (E) effective September 22, 1983 (Supp. 83-5). Former Section R9-3-201 renumbered without change as Section R18-2-201 (Supp. 87-3). Amended effective September 26, 1990 (Supp. 90-3). Amended by final rulemaking at 11 A.A.R. 3305, effective October 3, 2005 (Supp. 05-3). Section corrected to include subsection (B), which was inadvertently omitted in Supp. 05-3 (Supp. 07-4). Amended by final rulemaking at 18 A.A.R. 1542, effective August 7, 2012 (Supp. 12-2). Amended by final rulemaking at 23 A.A.R. 333, effective 3/21/2017.