15A NCAC 02D .0408 LEAD
The ambient air quality standard for lead and its compounds, measured as elemental lead by a reference method based on Appendix G of 40 CFR Part 50 or by an equivalent method established under 40 CFR Part 53, shall be 0.15 micrograms per cubic meter. The standard shall be deemed met when the maximum arithmetic three-month mean concentration for a three-year period, as determined in accordance with Appendix R of 40 CFR Part 50, is less than or equal to 0.15 micrograms per cubic meter.
History Note: Authority G.S. 143-215.3(a)(1); 143-215.107(a)(3);
Eff. June 1, 1980;
Amended Eff. January 1, 2010; July 1, 1984;
Readopted Eff. January 1, 2018.