IDEM utilizes air quality data to provide the following ozone reports and summaries:
- Ozone Season Summary Reports
- 8-Hour Ozone Status:
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary:
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2025 [PDF]
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2024 [PDF]
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2023 [PDF]
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2022 [PDF]
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2021 [PDF]
- 8-Hour Ozone Air Quality Action and Exceedance Days Summary 2020 [PDF]
- Archive:
- 8-Hour Ozone Critical Values:
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