- R15-4, National Ambient Air Quality Standards, USEPA Regulations (January 1, 2014 through
June 30, 2014 and November 4, 2014)
On November 20, 2014, the Board proposed for public comment amendments to the Illinois
ambient air quality standards that are “identical in substance” to National Ambient Air Quality
Standards (NAAQS) amendments made by USEPA during the first half of calendar year 2014.
- The Board also proposed adding an action from outside the timeframe of the docket, November
4, 2014: USEPA designated one new federal reference method (FRM) for fine particulates
(PM2.5) and another for coarse particulates (PM10-2.5); and USEPA designated one new FEM for
O3 and one new FEM for car...
Board Proposes Amendments To The Illinois Ambient ... 
