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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:

Active weather will lead to Good air quality through the weekend. A strong coastal storm will hit the state Saturday morning. Copious precipitation along with increased winds will help clean the air to the Good range for most locations. Northwest winds behind the storm will lead to Good air quality again on Sunday. Another snow event on Monday keeps Good air quality in place with long and clean air trajectories, which also persist with Good air quality into Tuesday. With new snowfall and approaching high pressure on Wednesday, a quick rebound in fine particle concentrations is expected, along with Moderate air quality. - 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.