Ambient Air Monitoring Network

Federal Regulations require States to submit to USEPA an annual air monitoring network plan for the prospective calendar year. The plan is to provide a detailed description of the monitoring network for all of the criteria pollutants: carbon monoxide (CO), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), ozone (O₃), particulate matter (PM₁₀ and PM_2.5), and lead (Pb). Among other information, the plan is to include location information (address and latitude/longitude), site type, objectives, spatial scale, sampling schedule, and equipment type. In addition, changes from the previous network plan are to be listed. Also, this plan includes an Appendix with the information necessary to meet the Data Requirements Rule SO₂ Emissions Assessment for those areas modeled to be in attainment with the SO₂ National Ambient Air Quality Standards.

• View the Illinois Ambient Air Monitoring Network Plan for 2024

Relevant supporting air quality data in past Illinois Annual Air Quality Reports is available. These summaries contain detailed monitoring data from the network which show comparisons to the various air quality standards as well as establish trends over time. 

The Illinois EPA accepted comments on the 2024 Plan from August 7, 2023 to September 6, 2023. Illinois EPA reviewed and responded to the comments received prior to submission of the Plan to USEPA.