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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:

Snow and rain on Wednesday will allow only threshold Good/Moderate conditions in the urban corridor, with Good air quality elsewhere. With new snow cover over northwestern areas of the state, fine particles will see an increase in concentration over the coming days. For Thanksgiving Thursday, fine particles will increase to the low-end Moderate range. Despite an airmass change Friday, fine particles are expected to continue in the low Moderate range. In to the weekend, fine particles are anticipated to continue an upward trend toward the middle Moderate range across much of the eastern half of the state Saturday and Sunday. - 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.