Valley Air District will perform scheduled system maintenance beginning at 6 PM on 6/29/2026. Some services may be temporarily unavailable for several hours.
Air Dispersion Modeling
Air dispersion modeling uses source input parameters, meteorological data, terrain, and other default modeling parameters to estimate the downwind dispersion of a pollutant emitted by a source. Dispersion modeling is an important tool used by air districts and other agencies to determine compliance with California and National Ambient Air Quality Standards (CAAQS/NAAQS) and to determine the potential localized health impacts from a project under the District’s permitting process, the AB 2588 Hots Spots program (AB 2588), and California Environmental Quality Act (CEQA). To assist local businesses and project proponents, please reference the helpful modeling and risk assessment resources linked below.

Meteorological and Ambient Air Quality Data

The District compiled a list of all the meteorological and ambient air monitoring stations located throughout the San Joaquin Valley. Meteorological and ambient background concentration data sets can be viewed and downloaded in this interactive search tool.

For assistance or if you have any questions, please feel free to contact us.

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