Section Env-A 305.01 - Primary Ambient Air Quality Standards for Carbon MonoxideThe primary ambient air quality standards for carbon monoxide (CO), CAS # 630-08-0, shall be as follows:
(a) The 8-hour primary ambient air quality standard for CO shall be 9 ppm, 8-hour average concentration; and(b) The 1-hour primary ambient air quality standard for CO shall be 35 ppm, 1-hour average concentration.N.H. Admin. Code § Env-A 305.01
#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