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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:

USG ozone conditions are expected Wednesday. Hot temperatures around 90F and light winds will foster ground-level ozone generation on Wednesday with concentrations nearing USG or "code orange" levels. On Thursday a weak cold front moves through the state bringing cleaner northerly winds, but with ample sunshine and temperatures remaining above normal, ozone concentrations will remain near the Good/Moderate threshold along the I-95 corridor and in the upper Good range elsewhere. Winds subside again under high pressure on Friday with ozone recovering into the Moderate range for most areas. - 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.