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 2017 (the most recent data available). With the exception of 2017, the 1-hour ozone levels steadily decreased since 2014 (baseline year for this PM), and were below the national standard of 0.12 PPM.

Champaign-Urbana 1-Hour Ozone Level

Year200920102011201220132014201520162017State Standard
1- Hour Ozone Level Parts Per Million (PPM)0.0850.0660.0880.0850.0740.0740.0720.0710.0730.12
Standard units are micrograms per cubic meter (μg/m3)
Data Source: IEPA, 2009-2017 Annual Air Quality Report

In 2015, the U.S. EPA lowered the 8-hour ozone standard from 0.075 ppm to 0.070 ppm. Ozone 8-hour levels in Champaign County increased in 2017 (the most recent data available). With the exception of 2017, the 8-hour ozone levels steadily decreased since 2014 (baseline year for this PM). Despite the increase in ozone levels, they remained below the national standard in 2017.

Champaign-Urbana 8-Hour Ozone Level

Year200920102011201220132014201520162017State Standard
8- Hour Ozone Level Parts Per Million (PPM)0.0690.0590.0780.0790.0680.0690.0660.0650.0680.07 starting 2015
Standard units are micrograms per cubic meter (μg/m3)
Data Source: IEPA, 2009-2017 Annual Air Quality Report

Air Quality PM Summary

Goal Promote healthy communities and improve overall residential quality of life by strengthening existing neighborhoods and housing developments, evaluating and expanding active transportation infrastructure, and promoting energy conservation and environmental quality.
Objective Improve 1 and 8-hour ozone levels for the entire Metropolitan Planning Area by 2020.
Performance Measure Number of both 1-hour and 8-hour periods achieving attainment level status for federal and state air quality standards
2016 Rating

1- Hour ozone level was 0.0718 PPM, and 8- Hour ozone level was 0.066 PPM in 2015.
This performance measure receives a positive rating as both 1-hour and 8-hour ozone pollutant levels decreased in measurements from 2014, and were below the national standard.

2017 Rating

1- Hour Ozone level was 0.071 PPM, and 8- Hour Ozone level was 0.066 PPM in 2016 (the most recent data available).
This performance measure receives a positive rating as both 1-hour and 8-hour ozone pollutant levels decreased in measurements from 2014, and were below the national standard.

2018 Rating

1- Hour Ozone level was 0.073 PPM, and 8- Hour Ozone level was 0.068 PPM in 2017 (the most recent data available). Although both the 1-hour and 8-hour ozone pollutant levels increased in the last year, the measurements have improved from 2014. Ozone pollution measurements remained below the national standard. Positive rating.