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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:

Copious snowfall along a slow moving cold front Thursday will decrease particle concentrations to the Good range for most areas, and near the Good/Moderate threshold for the major metropolitan areas. On Friday, a fresh snow pack will foster weak atmospheric mixing, particularly in western valleys, causing a rise in particle concentrations and Moderate air quality for most of the state. High pressure takes hold for the weekend, and though initially a clean airmass, reduced mixing and additional moisture due to snowmelt along with local pollution will quickly modify the air quality and keep Moderate air quality for Saturday through Monday. Saturday and Sunday will need to be monitored for fine particle concentrations perhaps reaching the upper Moderate range. - 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.