The Air District is now accepting applications for its new zero-emission transport refrigeration unit, or TRU, funding program, aimed at reducing air pollution from diesel-powered refrigeration units used in the transport of perishable goods.
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San Francisco County
Learn about San Francisco County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in San Francisco County and read about local efforts to improve air quality.
Latest News
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The Air District has issued 3 Notices of Violation to Valero for violations of air quality regulations and/or permit conditions for the May 5 fire. This is an ongoing investigation, and more violations may be issued.
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Air quality advisory for smoke from fire at ValeroMay 05, 2025
The Air District is issuing an air quality advisory for smoke in Southern Solano, northern Contra Costa, and northwestern Alameda counties, specifically communities between I-80 and I-680 bridges (Martinez, Pacheco, Concord and Port Chicago), but with some impact possible southward to Oakland, due to a fire at Valero.
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Spare the Air smog season beginsMay 05, 2025
The Air District is announcing the start of the Spare the Air summer smog season, which runs from May to October in the Bay Area.
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Upcoming Events
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MAY212025
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MAY272025
Other News Articles
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4/23/2025 Air District fines Kinder Morgan, Inc. $226,990 for air quality violations
April 23, 2025
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4/7/2025 Air District to host virtual webinar overview of the proposed budget for Fiscal Year 2025-2026
April 7, 2025
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3/27/2025 Point Richmond and North Richmond Odor
March 27, 2025
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3/25/2025 Air District asks community members to help shape how millions in community funds are spent
March 25, 2025
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3/21/2025 Join Webinar to Explore Careers at the Air District
March 21, 2025
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3/13/2025 Air District’s Clean HEET Program now accepting applications
March 13, 2025
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3/5/2025 Air District launches Charge! Program, expanding Bay Area access to electric vehicle chargers
March 5, 2025
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3/3/2025 Notice Regarding Fraudulent Bay Area Commuter Benefits Program Letters
March 3, 2025
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2/13/2025 MRC Refinery Fire Information
February 13, 2025
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2/1/2025 Air quality advisory for smoke from fire at MRC Refinery in Martinez
February 1, 2025
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1/28/2025 Air District asks public not to light firecrackers and fireworks or burn wood over Lunar New Year holiday
January 28, 2025
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1/22/2025 Air District launches new name and branding
January 22, 2025
San Francisco County rests at the northern end of the San Francisco Peninsula, bounded by San Mateo County in the south, the Pacific Ocean to the west, San Francisco Bay to the east, and the Golden Gate Bridge to the north. Three San Francisco County representatives sit on the Air District’s Board of Directors.
Climate
Because most of San Francisco's landscape is below 200 feet, the marine layer flows across most of the city, creating a cool and windy climate. The southeastern portion of the county, however, tends to be warmer and sunnier, with fewer foggy days. In the winter, average daily temperatures are mild overnight and moderate during the day, while summertime temperatures tend to remain moderate throughout the season. The highest wind speeds are focused along the western coast and generally mild throughout the county. Rainfall averages about 20 inches per year, with the highest amounts reported on the western coast.
Interactive Air Monitoring Stations Map
Air Quality in San Francisco County
Ozone and fine particle pollution, or PM2.5, are the major regional air pollutants of concern in the San Francisco Bay Area. Ozone is primarily a problem in the summer, and fine particle pollution in the winter.
In San Francisco, ozone almost never exceeds health standards and PM2.5 only exceeds the national standard once or twice each year, generally. Being surrounded by water on three sides keeps temperatures within a narrow range, whereby winter low temperatures rarely reach freezing and summer high temperatures stay well below levels where ozone would form and become unhealthy.
Spare the Air Status
Last Updated: 4/21/2017