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Who Does the Monitoring?

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The EPA's ambient air quality monitoring program is carried out by state and local agencies and federal land managers. Stations in a monitoring network fall into 4 major groups: State and Local Air Monitoring Stations (SLAMS), National Air Monitoring Stations (NAMS), and Special Purpose Monitoring Stations (SPMS) measure the criteria pollutants. The 4th group, the Photochemical Assessment Monitoring Stations (PAMS), measure ozone ingredients or recursors. In California, over 200 air pollution monitoring stations are operated by: the Calfornia Air Resources Board (CARB), local Air Pollution Control Districts or Air Quality Management Districts, private contractors, and the National Parks Service and U.S. Forest Service.

State and Local Air Monitoring Stations (SLAMS)

National Air Monitoring Stations (NAMS)

Special Purpose Monitoring Stations (SPMS)

Photochemical Assessment Monitoring Stations (PAMS)

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