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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:

High pressure to start Tuesday will cause recirculation of the air and higher morning fine particle concentrations. However, high pressure will give way to freezing rain and sleet by the afternoon helping to clean the air and end the day with low to mid Moderate air quality. Warming temperatures and dreary to foggy conditions develop and persist through Wednesday keeping fine particle concentrations in the Moderate range for the daily average. A cold front stalls across the state Thursday bringing a mixed back of precipitation and causing air quality to persist in the Moderate range. - 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.