PM2.5 Monitoring Planning Areas in California

This page last reviewed June 25, 2001

A Monitoring Planning Area (MPA) is a common area for planning monitoring locations for PM2.5. During the early stages of the PM2.5 network design process, the ARB and the local air quality management districts established 18 MPAs in the state, as shown on the map below. These MPAs have been used for locating PM2.5 monitoring sites throughout California.

The MPAs are not intended to be used for area designations or planning control measures. The boundaries to be used for these purposes will not be established until adequate PM2.5 data are available. The ARB and the local air quality management districts will recommend appropriate nonattainment boundaries to the U.S. EPA.



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Please send questions or comments to ARB's Air Quality Data Program.


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