Section Env-A 304.02 - Determination of Attainment of SO[2] Standards The department shall determine attainment of the primary and secondary standards for SO2 specified in Env-A 304.01 as follows:
(a) The primary ambient air quality standard for SO2 shall be deemed to be attained when the 3-year average of the annual 99th percentile of the daily maximum 1-hour average concentrations, as determined in accordance with 40 CFR 50 Appendix T, is less than or equal to 75 ppb; and(b) The secondary ambient air quality standard for SO2 shall be deemed to be attained when the 3-hour average concentration exceeds 0.5 ppm not more than once per calendar year.N.H. Code Admin. R. Env-A 304.02
#120, eff 8-31-73; ss by #721.3, eff 12-7-75; ss by #1717, eff 2-19-81; ss by #2332, eff 4-29-83; ss by #2938, eff 12-27-84; ss by #5033, eff 12-27-90; ss by #6227, eff 4-25-96; ss by #8054, eff 2-28-04; ss by #10173, eff 9-1-12
Amended by Volume XLII Number 23, Filed June 9, 2022, Proposed by #13382, Effective 5/25/2022, Expires 5/25/2032