Seasonal Air Quality Reports provide updates regarding the status of air quality in Maryland during the warm season (generally April/May through September) for ground-level ozone pollution and year-round for fine particle pollution. These reports are typically issued once per year and often use the Air Quality Index (AQI) to describe historical data.
Click on a check mark below to view a report.
These reports are often published using preliminary air quality data that have not been finalized by the Ambient Air Monitoring Program staff unless noted otherwise and are intended for informational purposes only. In addition, reports may use different AQI from year to year to reflect the latest health-based National Ambient Air Quality Standards (NAAQS) and AQI for ozone and particulate matter. Each report notes the NAAQS and/or AQI in use. For more information on ozone and particulate matter NAAQS revisions, see:
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