Air Pollutant Exposure Zone

Use the search function (top left corner of map) to navigate to a particular address or location in San Francisco to determine if it is in the 2025 Air Pollutant Exposure Zone.

How is this information used?

San Francisco Planning and the San Francisco Department of Public Health use the map to require protections for existing and future residents, childcare or K-12 school attendees, and workers. This may include requiring developers to install high-quality air filtration systems in new buildings, to use the cleanest construction equipment available, or to purchase the best available technology for backup diesel generators.

Move the slider to compare the 2020 (left side) and 2025 (right side) air pollutant exposure zone maps.

Why is the 2025 map area larger than 2020?

The 2025 update reflects the previously modeled 2020 data with the addition of a new federal standard for air quality and enhanced health protection for San Francisco residents.

In February 2024, the  United States Environmental Protection Agency (US EPA)  announced its decision to lower the current PM _2.5  standard of 12 μg/m ³  to 9 μg/m ³  to provide increased public health protection, consistent with the available health science. Previously, the City and County of San Francisco identified PM _2.5  health risk at 10 μg/m ³  citywide and 9 μg/m ³  within health vulnerable zip codes, as areas with elevated air pollution. In this map update, the APEZ’s PM _2.5  standard is now 9 μg/m ³  citywide, which aligns with the US EPA standard.

The updated 2025 APEZ map also includes parcels within  1,000 feet of any roadways with a daily average of 100,000 vehicles or more . The existing buffer of 500 feet from freeways throughout the city is still incorporated.

For more information, visit  https://sfplanning.org/air-quality.