Overview
Colfax-City Hall is an operational air monitoring station in Colfax, California, managed by the California Air Resources Board. It contributes to the US EPA Air Quality System network, tracking criteria pollutants and supporting public health.
Colfax-City Hall is an air monitoring station located at City Hall, 33 S Main Street, Colfax, California, within Placer County. Operated under the California Air Resources Board, this station is part of the broader US EPA Air Quality System (AQS) network, which monitors ambient air quality across the United States. The station's location in the Sierra Nevada foothills provides representative data for a mixed urban and natural environment. The station operates under the regulatory framework of the US Clean Air Act, with monitoring parameters typically including criteria pollutants such as ozone, particulate matter, nitrogen dioxide, and carbon monoxide. As part of the California Air Resources Board's network, it adheres to stringent quality assurance protocols and siting criteria to ensure data representativeness. The station's last reported sample date is August 31, 2025, indicating ongoing operations. Environmental monitoring at this site supports local and regional air quality management, helping to assess compliance with National Ambient Air Quality Standards (NAAQS). The data collected aids in understanding pollution transport from the Sacramento Valley and informs public health advisories. Colfax's location near forested areas also contributes to monitoring wildfire smoke impacts, a growing concern in California.
Environmental context
Colfax is situated in the Sierra Nevada foothills, where air quality can be influenced by both urban emissions from the Sacramento Valley and natural sources like wildfires. The California Air Resources Board's monitoring network emphasizes siting representativeness to capture regional pollution gradients. This station likely measures criteria pollutants and may include speciation or meteorological parameters to support regulatory compliance and health research.
Frequently asked questions
Colfax-City Hall is located at City Hall, 33 S Main Street, Colfax, California, in Placer County, United States.
As part of the California Air Resources Board network, the station typically measures criteria pollutants such as ozone, particulate matter, nitrogen dioxide, and carbon monoxide, following US EPA standards.
The station is operated by the California Air Resources Board, which manages a statewide network of air quality monitoring stations.
Air monitoring in the US is governed by the Clean Air Act and implemented through the EPA's Air Quality System (AQS) network, which sets standards for monitoring methods, siting, and data reporting.
The station provides data to assess compliance with National Ambient Air Quality Standards (NAAQS), supports public health advisories, and helps track pollution trends in the Sierra Nevada region.
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