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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:

Very warm and humid conditions are expected through the coming week leading to some deterioration of air quality. On Monday, humid conditions after passing morning showers will lead to Moderate fine particle air quality along the I-95 corridor and Good air quality elsewhere. On Tuesday, temperatures in to the low 90s will deteriorate air quality, but mixing provided by winds should limit ozone to the Moderate AQI range. Behind a weak cold front on Wednesday, slight reprieve from humidity reduces fine particles but ample sunshine and above normal temperatures continue to support Moderate ozone AQI. - 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.