N.H. Code Admin. R. Env-A 304.01

Current through Register No. 25, June 20, 2024

Section Env-A 304.01 - Primary and Secondary Ambient Air Quality Standards for Sulfur Dioxide

The primary and secondary ambient air quality standards for sulfur dioxide (SO₂), chemical abstracts service registry number (CAS #) 7446-09-5, shall be as follows:

(a) The primary ambient air quality standard for SO₂ shall be 75 parts per billion (ppb), 1-hour average concentration; and

(b) The secondary ambient air quality standard for SO₂ shall be 0.5 parts per million (ppm), 3-hour average concentration.

N.H. Code Admin. R. Env-A 304.01

#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