Due to heavy winter rainfall, the Air District has extended the permissive burn periods for Crop Replacement and Orchard Pruning & Attrition fires until June 30, 2024.
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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.
Due to heavy winter rainfall, the Air District has extended the permissive burn periods for Crop Replacement and Orchard Pruning & Attrition fires until June 30, 2024.
The Air District has announced the appointment of prominent environmental justice leader Arsenio Mataka as deputy executive officer for Equity & Community Programs at the agency's Community, Health and Environmental Justice Committee meeting.
The Air District is announcing that its independent Hearing Board has ordered Martin Marietta to get a permit for the company’s sand distribution plant located at Pier 92 in Bayview Hunters Point, San Francisco. The Hearing Board has also imposed restrictions on the plant’s operations to reduce emissions and protect public health.
The Air District has fined the City of Berkeley $130,000 for air quality violations that occurred at its landfill site at Cesar Chavez Park in Berkeley from 2019 - 2022.
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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.
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.
San Mateo County's climate is also affected by regional Bay Area climate influences.
Interactive Air Monitoring Stations Map
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.
Last Updated: 4/21/2017