N.C. Department of Environment and Natural Resources
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(a) The ambient air quality standards for total suspended particulate matter are:

(1) (2)

75 micrograms per cubic meter annual geometric mean, 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 Appendix B of 40 C.F.R Part 50 or equivalent methods established under 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.


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Last Modified: Mon Mar 10 08:12:35 2008
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