1 and 8-hour attainment level status for air quality

According to IEPA, when reactive (nonmethane) hydrocarbons and nitrogen oxides accumulate in the atmosphere and are exposed to the ultraviolet component of sunlight, the formation of new compounds, including ozone and peroxyacetylnitrate, takes place. Injury to vegetation is one of the earliest manifestations of photochemical air pollution. Clinical and epidemiological studies have demonstrated that ozone impairs the normal mechanical function of the lung, causing alterations in respiration – the most characteristic of which are shallow, rapid breathing and a decrease in pulmonary compliance. Ozone also accelerates the aging of many materials, resulting in rubber cracking, dye fading, and paint erosion. These effects are linearly related to the total dose of ozone and can occur at very low levels, given long-duration exposures. Previously for the Champaign-Urbana urbanized area, ozone levels for the urbanized area were available a monitoring site at B. T. Washington Elementary School in Champaign, which was removed in 2010. The closest station that monitors ozone levels is currently in Bondville.

The table and chart below show the 1-hour ozone measurements from 2009 to 2018 (the most recent data available). The 1-hour ozone levels steadily remained between 0.071 and 0.074 since 2014 (baseline year for this PM) and were below the national standard of 0.12 PPM.

Champaign-Urbana 1-Hour Ozone Level

Year2009201020112012201320142015201620172018State Standard
1- Hour Ozone Level Parts Per Million (PPM)0.0850.0660.0880.0850.0740.0740.0720.0710.0730.0730.12
Standard units are micrograms per cubic meter (μg/m3)
Data Source: IEPA, 2009-2018 Annual Air Quality Report

In 2015, the U.S. EPA lowered the 8-hour ozone standard from 0.075 ppm to 0.070 ppm. The 8-hour ozone levels decreased by 0.002 PPM in 2018 compared with 2014 (baseline year for this PM) and they remained below the national standard of 0.07 PPM in 2018.

Champaign-Urbana 8-Hour Ozone Level

Year2009201020112012201320142015201620172018State Standard
8- Hour Ozone Level Parts Per Million (PPM)0.0690.0590.0780.0790.0680.0690.0660.0650.0680.0670.07 starting 2015
Standard units are micrograms per cubic meter (μg/m3)
Data Source: IEPA, 2009-2018 Annual Air Quality Report