For the purpose of determining attainment of the primary and secondary ambient air quality standards for SO2 specified in Env-A 304.01, sulfur dioxide in the ambient air shall be measured by either:
N.H. Admin. Code § Env-A 304.03
#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