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Maryland State Government Maryland Department of the Environment

Current Air Quality Conditions

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Clean Air Partners
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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:

Good air quality is expected tomorrow in Maryland as cleaner air filters in behind Thursday?s cold front. Despite hot and sunny conditions, clean air will mix down from aloft, limiting ozone production. Saturday will be a pleasant day with warm and increasingly humid conditions. The origin of the air aloft will shift to the Ohio River Valley, an area rich in ozone precursors. A weak cold front moving through the state will cause converging winds to promote ozone buildup. These factors will promote both ozone and particles into the Moderate range. Sunday?s ozone and particle concentrations are expected to increase slightly from Saturday. This will be due to continuing sunny skies and light westerly winds as well as converging air along a weak evening cold front. - MDE/PSAQFO

If you have any questions, please contact Janice Lafon at 410-537-3280 or e-mail at so that she may direct your inquiry.