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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San Mateo County
Learn about San Mateo County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in San Mateo County and read about local efforts to improve air quality.
Latest News
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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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Air District increases Vehicle Buy Back Program incentive and expands eligibility effective July 1June 12, 2025
Effective July 1, the Air District is expanding the Vehicle Buy Back Program, which takes older, high-polluting vehicles off the road that would otherwise likely remain in operation. The program is increasing the incentive amount to $2,000 per vehicle and including vehicles that are model year 2000 and older.
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Other News Articles
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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 Mateo County lies in the middle of the San Francisco Peninsula, south of San Francisco County, and north of Santa Clara and Santa Cruz counties. It is bounded by the Pacific Ocean to the west and San Francisco Bay to the east. Two San Mateo County representatives sit on the Air District’s Board of Directors.
Climate
Cool, foggy weather is prevalent along the western coast of the peninsula, particularly during the summer. Summertime average daily temperatures are moderate along the west coast and warm in the county’s east side. In the winter, average daily temperatures across the county range from mild to moderate. Winds are mild, with the highest wind speeds focused along the western coast. Rainfall averages about 20 to 25 inches per year at lower elevations and up to 36 inches in the Santa Cruz Mountains.
Interactive Air Monitoring Stations Map
Air Quality in San Mateo 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 Mateo County, ozone almost never exceeds health standards, and PM2.5 exceeds the national standard only on about one day each year. San Mateo County frequently receives fresh marine air from the Pacific Ocean, which passes over the coastal hills. In winter, PM2.5 may be transported into San Mateo County from other parts of the Bay Area, adding to wood smoke, which may lead to elevated concentrations, but these are rarely high enough to exceed health standards.
Spare the Air Status
Last Updated: 4/21/2017