15A NCAC 02D .0403      TOTAL SUSPENDED PARTICULATES

(a)  The ambient air quality standards for total suspended particulate matter are:

(1)           75 micrograms per cubic meter annual geometric mean; and

(2)           150 micrograms per cubic meter maximum 24‑hour concentration not to be exceeded more than once per year.

(b)  Sampling and analysis shall be in accordance with procedures in 40 CFR Part 50, Appendix B or equivalent methods established pursuant to 40 CFR Part 53.

History Note:        Authority G.S. 143‑215.3(a)(1); 143‑215.107(a)(3);

Eff. February 1, 1976;

Amended Eff. July 1, 1988; July 1, 1984; October 15, 1981;

Readopted Eff. November 1, 2020.