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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:

Wednesday will be a day of high Moderate ozone in the metropolitan areas. Temperatures in the low 90s ? F, mostly sunny skies, light surface winds, and carry-over of ozone from Tuesday will all be important factors contributing to the increased ozone levels. Particles will also reach well into the Moderate range as the humidity and stagnant conditions continue. A weak cold front will move through the state on Thursday, increasing cloud cover in the afternoon and limiting ozone to the low Moderate range for most locations. Particle concentrations statewide will remain in the Moderate range as dew points climb into the 70s ? F. Friday will see ozone hovering around the Good/Moderate threshold as the front stalls just east of the state and surface winds shift westerly, containing Moderate ozone to the I-95 Corridor. Particles will fall to the Good/Moderate threshold as dew points drop and a cleaner air mass builds into the state. - 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.