EPA Sends Letter to States Outlining Next Steps for SO2 NAAQS Implementation

EPA recently sent a letter to Wisconsin outlining the agency’s plans for moving forward with implementation of the 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS). 

In the update, EPA intends to initiate the following actions:  1) move forward with the current designations process as soon as possible; 2) initiate stakeholder outreach in the near future to ask for input on monitoring, modeling and implementation issues, particularly for unclassifiable areas; and 3) no longer expect states’ June 2013 State Implementation Plan (SIP) submittal to contain modeling demonstrations showing attainment of the SO2 standard in unclassifiable areas.

EPA recommends that states instead focus their June 2013 SIP submittal on traditional infrastructure elements contained in Clean Air Act sections 110(a)(1) and (2).

Additional information on current SO2 regulations can be found at http://dnr.wi.gov/topic/AirQuality/Pollutants.html#tabx4  The original EPA letter can be found on the DNR website http://dnr.wi.gov/ topic/AirQuality/SO2.html