Area Designations in Illinois
EPA is responding to a request related to final designations for the 2010 health based sulfur dioxide air quality standard for Williamson County, IL.
See EPA's proposed response to this petition.
- Petition for Error Correction in Final Rule Designating Williamson County, Illinois as Nonattainment under Air Quality Designations for the 2010 Sulfur Dioxide (SO2) National Ambient Air Quality Standard - Round 2 (pdf)
- Response Letter to Peter S. Glaser on Petition for Error Correction for Williamson County, IL (pdf)