USEPA’s Reclassification of Air Non-Attainment Status

Some regions of the U.S have failed to meet the ozone National Ambient Air Quality Standards (NAAQS) and the Chicago-Naperville, IL-IN-WI nonattainment area that was previously classified as “moderate” has been downgraded to “serious”.


The consequence of failing to attain the standard can be substantial for existing owners or operators of facilities in the Chicagoland area that emit ozone regulated pollutants, volatile organic compounds (VOCs) or nitrogen oxides (NOx).  The main impacts of the reclassification include: 

  • Title V major source thresholds for VOC and NOx will be going from 100 tpy to 50 tpy

  • New source review major modification threshold will be going from 40 tpy to 25 tpy aggregated over 5 years

  • Emissions offset requirements will be going from 1.15 to 1, to 1.2 to 1;

  • New Reasonable Available Control Technology (RACT) requirements may be implemented to control sources emitting between 50 to 100 tpy.

Other regions impacted by the reclassification are:

  • Dallas-Fort Worth, TX
  • Greater Connecticut, CT
  • Houston-Galveston-Brazoria, TX
  • Nevada County (Western part), CA
  • New York-North New Jersey-Long Island, CT-NY-NJ, and
  • San Diego County, CA.

Contact Us


Chris Blume

Vice President T: +1 (312) 262-4371 Email
Chicago | US

Bill Pearce

Manager T: +1 312 262 4358 Email
Chicago | US

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