Section 325.60152. Definitions pertaining to contaminants.

Rule 2.  As used in these rules:

(a)      "Maximum allowable concentration" or  "MAC" means   the   threshold limit value or the time-weighted  average  8-hour  airborne   concentration  of  a contaminant to which a person may be safely exposed.

(b)     "Mg/m3" means milligrams of particulate per cubic meter of air.

(c)      "Mppcf" means millions of particulates per cubic foot of air based on impinger samples counted by light field microscopic techniques.

(d)           "Non-respirable atmosphere"  means   an  atmosphere  which contains insufficient oxygen, or an elevated level of contaminants which may render a person incapable of self-rescue.

(e)     "Ppm" means parts of vapor or gas per million parts of air by volume at 25 degrees Celsius and 760 millimeters of mercury pressure.

(f)     "Source" means a process or equipment that releases a contaminant into the air in concentrations exceeding the MAC.

History: 2002 AACS.