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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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Air District’s Clean HEET Program now accepting applicationsMarch 13, 2025
The Air District’s Clean HEET Program is now accepting applications for grants that can help to offset the cost of switching from wood-burning or pellet-burning stoves, fireplace inserts, or open-hearth fireplaces to an electric heat pump. A decommission-only option is also available for homeowners to remove existing open-hearth fireplaces or older, uncertified wood-burning stoves or inserts. Switching to an electric heat pump helps improve air quality in communities by replacing polluting wood-burning devices with cleaner heating options.
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Air District launches Charge! Program, expanding Bay Area access to electric vehicle chargersMarch 05, 2025
The Air District is announcing the launch of the Charge! Program’s grant application process to access at least $10 million in grant funding to offset the cost of purchasing and installing new chargers for light-duty electric vehicles at multi-family housing facilities, destinations, transit parking locations, and workplaces across the Bay Area. This funding is available to businesses, homeowner associations, non-profits, public agencies, and tribes. Applications are being accepted now through June 6, 2025, at 5PM.
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It has been reported that companies throughout the Bay Area have received letters dated January 1, 2025, February 1, 2025, and February 14, 2025, with misinformation about the Bay Area Commuter Benefits Program. These letters were not sent by the Bay Area Air District or the Metropolitan Transportation Commission and contain misinformation. Please disregard these letters if you received them. If your company is registered in the Commuter Benefits Program, you can check the Commuter Benefits Program website to verify your company's registration in the system.
Learn More -
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February 13, 2025
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February 01, 2025
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Other News Articles
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1/22/2025 Air District launches new name and branding
January 22, 2025
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12/30/2024 Air District asks public to not burn wood through the New Year’s holiday
December 30, 2024
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12/19/2024 Spare the Air Alert issued for Friday, December 20. Wood-burning is prohibited.
December 19, 2024
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12/8/2024 Spare the Air Alert issued for today, Sunday, December 8
December 8, 2024
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11/30/2024 Spare the Air Alerts issued for Sunday and Monday due to wood smoke pollution
November 30, 2024
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11/26/2024 Air District asks public to not burn wood over Thanksgiving holiday
November 26, 2024
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11/19/2024 Air District to host Clean Air Talk in San Lorenzo on December 7
November 19, 2024
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11/12/2024 Air District to represent Bay Area at COP29
November 12, 2024
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11/6/2024 Air District releases woodsmoke white paper for public comment
November 6, 2024
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10/31/2024 Air District and CARB fine Valero Refining Co. $82 million for air quality violations
October 31, 2024
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10/25/2024 Air District issues air quality advisory for Friday and Saturday
October 25, 2024
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10/18/2024 Air District issues air quality advisory for Friday
October 18, 2024
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10/17/2024 Air District to host Clean Air Talk in East Palo Alto on November 2
October 17, 2024
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10/17/2024 Air District fines Radius Recycling, formerly Schnitzer Steel, $575,000 for air quality violations
October 17, 2024
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