"Activity level" means "activity level" as defined in the US EPA's proposed Model Open Market Trading Rule (60 FR 39668, August 3, 1995), namely, "the amount of activity at a source measured in terms of production, use, raw materials input, vehicle miles traveled, or other similar units that have a direct correlation with the economic output of the source and is not affected by changes in the emissions rate (i.e., mass per unit of activity)."
N.H. Admin. Code § Env-A 3002.01
#6441, EXEMPT, eff 1-21-97