Section 326IAC1-2-52.2. "PM2.5" defined  


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  •   2. "PM2.5" means particulate matter with an aerodynamic diameter less than or equal to a nominal two and five-tenths (2.5) micrometers (μm). (Air Pollution Control Division; 326 IAC 1-2-52.2; filed Dec 20, 2004, 2:15 p.m.: 28 IR 1471)