. . "Technical support document : recommended attainment / nonattainment designations in Illinois for the 2010 revised primary 1-hour SO₂ national ambient air quality standard"@en . . . . . . "The U.S. Environmental Protection Agency revised the primary sulfur dioxide national ambient air quality standard in June 2010. As a result, Illinois is required to provide recommendations for attainment/nonattainment are boundaries for this 2010 revision. This report discusses air quality data for the Peoria area, Tazewell , Peoria, La Salle, Cook, Will, and Madison counties. The Metro-East area is also included."@en . . "Recommended attainment/nonattainment designations in Illinois for the 2010 revised primary 1-hour SO2 national ambient air quality standard" . . . . . . . "Technical support document, recommended attainment/nonattainment designations in Illinois for the 2010 revised primary 1-hour SO2 national ambient air quality standard" . . . . . . . "Recommended attainment/nonattainment designations in Illinois for the 2010 revised primary one hour SO2 national ambient air quality standard"@en .