Section 211.4770  PM-10

"PM-10" means particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers, as measured by the applicable test methods specified by rule.  Ambient air concentrations for PM-10 are usually expressed in micrograms per cubic meter (ug/m(3)).

(Source:  Added at 17 Ill. Reg. 16504, effective September 27, 1993)