The Air District urges residents to celebrate responsibly this Fourth of July by avoiding personal fireworks, which can elevate air pollution and increase wildfire danger. Fireworks release smoke and fine particulate matter pollution, contributing to temporary spikes in unhealthy air quality.
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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 is extending an air quality advisory due to wildfire smoke from Canada and Alaska in the Bay Area through Monday, June 23. Smoke from various wildfires in western Canada and in Alaska is expected to continue to impact air quality in the Bay Area on Monday. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict. The public can check for real-time smoke pollution levels in their local area with the U.S. EPA’s Fire and Smoke Map. Smoky, hazy skies may be visible, the smell of smoke is possible and air quality may become unhealthy on Monday.
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The Air District is issuing an air quality advisory due to wildfire smoke from Canada and Alaska in the Bay Area for Sunday, June 22. Smoke from various wildfires in western Canada and in Alaska is expected to impact air quality in parts of the Bay Area on Sunday. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict. The public can check for real-time smoke pollution levels in their local area with the U.S. EPA’s Fire and Smoke Map. Smoky, hazy skies may be visible, the smell of smoke is possible and air quality may become unhealthy on Sunday.
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Air District issues air quality advisory for smoke from Somersville brush fire for Wednesday eveningJune 18, 2025
The Air District is issuing an air quality advisory due to smoke from the Somersville brush fire in Antioch. Smoke from this brush fire is expected to impact air quality in eastern Contra Costa County on Wednesday evening. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict. The public can check for real-time smoke pollution levels in their local area with the U.S. EPA’s Fire and Smoke Map. The Air District will continue to monitor conditions to see if impacts will continue on Thursday. Smoky, hazy skies may be visible, the smell of smoke is possible and air quality may become unhealthy as of Wednesday evening.
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Upcoming Events
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Other News Articles
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6/4/2025 Air District extends air quality advisory for wildfire smoke through Thursday
June 4, 2025
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6/3/2025 Air District extends air quality advisory for wildfire smoke through Wednesday
June 3, 2025
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6/2/2025 Air District issues air quality advisory for wildfire smoke for Monday and Tuesday
June 2, 2025
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5/31/2025 Air District issues air quality advisory due to flaring at Chevron Refinery
May 31, 2025
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5/29/2025 Air District issues Spare the Air Alert for Friday
May 29, 2025
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5/21/2025 Air District Releases Draft Ambient Air Monitoring Network Plan
May 21, 2025
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5/14/2025 Air District opens funding opportunity for zero-emission transport refrigeration units
May 14, 2025
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5/6/2025 Air District Issues 3 Notices of Violation to Valero as a result of the May 5 fire
May 6, 2025
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5/5/2025 Air quality advisory for smoke from fire at Valero
May 5, 2025
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5/5/2025 Spare the Air smog season begins
May 5, 2025
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5/1/2025 Air District Issues 18 Notices of Violation to Martinez Refining Company as a result of the February 1 fire
May 1, 2025
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5/1/2025 Air District Soliciting Applications for Community Advisory Council Seats
May 1, 2025
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4/30/2025 Apply now to join the Community Workgroup for the Refinery Community Particle Fallout Sampling Program
April 30, 2025
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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