The Air District is issuing an air quality advisory for smoke in Contra Costa and Solano counties due to a fire at MRC’s Martinez refinery.
-
About the Air District
- Air District Logos
- Board of Directors
- Advisory Council
- Job Opportunities
- Mission Statement
- History of Air District
- Departments
- Diversity Equity and Inclusion
- Air District Leadership
- Hearing Board
- Community Advisory Council
- Bay Area Clean Air Foundation
- Request for Proposals (RFP RFQ)
- In Your Community
- Speakers and Tours
- News & Events
- Online Services
- Publications
- Forms
- Public Records
- Contact Us
- Login
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
-
-
Air District asks public not to light firecrackers and fireworks or burn wood over Lunar New Year holidayJanuary 28, 2025
The Air District is asking the public not to light fireworks or burn wood over the Lunar New Year holiday to keep air quality from becoming unhealthy.
Learn More -
Air District launches new name and brandingJanuary 22, 2025
The Bay Area Air District is announcing its new name and logo. The new look symbolizes the Air District’s new direction through recent leadership changes, reflecting a modernized brand that helps the agency stay connected and effective in its mission.
Learn More -
Air District asks public to not burn wood through the New Year’s holidayDecember 30, 2024
The Air District is asking the public to not burn wood in their fireplaces, woodstoves, or outdoor fire pits through the New Year’s holiday to keep air quality from becoming unhealthy.
Learn More -
-
-
December 08, 2024
-
-
Other News Articles
-
11/26/2024 Air District asks public to not burn wood over Thanksgiving holiday
November 26, 2024
-
11/19/2024 Air District to host Clean Air Talk in San Lorenzo on December 7
November 19, 2024
-
11/12/2024 Air District to represent Bay Area at COP29
November 12, 2024
-
11/6/2024 Air District releases woodsmoke white paper for public comment
November 6, 2024
-
10/31/2024 Air District and CARB fine Valero Refining Co. $82 million for air quality violations
October 31, 2024
-
10/25/2024 Air District issues air quality advisory for Friday and Saturday
October 25, 2024
-
10/18/2024 Air District issues air quality advisory for Friday
October 18, 2024
-
10/17/2024 Air District to host Clean Air Talk in East Palo Alto on November 2
October 17, 2024
-
10/17/2024 Air District fines Radius Recycling, formerly Schnitzer Steel, $575,000 for air quality violations
October 17, 2024
-
10/8/2024 Air District issues air quality advisory for Novato
October 8, 2024
-
10/8/2024 Air District to host Building Appliance Rules learning session on October 22
October 8, 2024
-
10/7/2024 Air District to host public meeting on Radius Recycling permit application
October 7, 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