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Maryland State Government Maryland Department of the Environment

Ambient Air Monitoring Program

The Ambient Air Monitoring Program measures ground-level concentrations of criteria pollutants and air toxics, along with surface and aloft meteorological parameters. The Program also performs quality control, quality assurance, and analysis of the pollutant concentrations that are measured at each of the air monitoring stations located throughout Maryland. It is responsible for Air Quality Index (AQI) reporting and issuing daily air quality forecasts as well as coordination of 3D air-shed photochemical grid and dispersion modeling.

In addition, the Program collaborates with local universities to conduct special atmospheric monitoring research to better characterize aloft and surface atmospheric pollutant concentrations. These research initiatives support air quality planning and regulations development.

Learn More:

To report an environmental emergency, see Emergency Numbers.

Air Quality Forecast Discussion:

Ozone concentrations will be building through the weekend towards upper Moderate AQI by Memorial Day. On Friday, Good air quality will persist on strong northwesterly winds in a clean airmass. Clean air is reinforced on Saturday as another cold front brings Good air quality and very mild but sunny weather. High pressure takes control by Sunday, and with sunny skies and slackening winds as well as a typically busy holiday weekend, ozone will likely break into the Moderate range. On Monday, well above normal temperatures combining with an increasing regional pollutant load will push ozone concentrations towards upper Moderate AQI statewide. - MDE

If you have any questions, please contact Janice Lafon at 410-537-3280 or e-mail at so that she may direct your inquiry.