The Air District has awarded $3.1 million to RPEV Infrastructure 2, LLC to purchase and install 46 new electric vehicle chargers and associated infrastructure at a fleet vehicle charging depot in Richmond.
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Santa Clara County
Learn about Santa Clara County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Santa Clara County and read about local efforts to improve air quality.
Latest News
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The Air District has fined Republic Services $159,000 for 14 air quality violations at the Sonoma Central Landfill in Petaluma.
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Air District issues prescribed burn notice for October 27-31October 27, 2025
The Air District has issued the following prescribed burn notice effective October 27-31.
- Kamryn, hills near Route 92 and I280, 55 acres, Cal Fire San Mateo-Santa Cruz Unit
- Angel Island State Park, 40 acres, California State Parks
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Air District awards $5M to electrify special education school busesOctober 22, 2025
The Bay Area Air District today announced $4,822,770 in funding to SAFETRANS Transportation Inc. to deploy electric school buses serving special education students across Santa Clara County. The grant will support the purchase of 14 zero-emission buses and 11 charging stations, helping to electrify transportation services for some of the region's most vulnerable students.
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October 17, 2025
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Upcoming Events
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Other News Articles
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9/27/2025 Air District issues air quality advisory for wildfire smoke through Sunday
September 27, 2025
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9/25/2025 Air District receives first finance award for excellence in budget process
September 25, 2025
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9/22/2025 Air District issues Spare the Air Alert for Tuesday
September 22, 2025
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9/15/2025 Air District awards $1.18 million to San Ramon Valley Unified School District for new EV school buses, charging infrastructure
September 15, 2025
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9/11/2025 Air District opens Clean Cars for All program with $10 million in funding
September 11, 2025
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9/10/2025 Air District strengthens leadership team, staffing to deliver on permitting priorities & strategic goals
September 10, 2025
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9/2/2025 Air District fines Chemtrade West US LLC $160,000 for air quality violations
September 2, 2025
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8/26/2025 Air District lifts air quality advisory for wildfire smoke
August 26, 2025
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8/26/2025 Air District awards $13.3 million to SamTrans toward the installation of new zero-emission bus charging infrastructure
August 26, 2025
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8/25/2025 Air District extends air quality advisory for wildfire smoke through Wednesday
August 25, 2025
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8/23/2025 Air District extends air quality advisory for wildfire smoke through Monday
August 23, 2025
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8/22/2025 Air District extends air quality advisory for wildfire smoke through Saturday
August 22, 2025
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8/21/2025 Air District issues air quality advisory for wildfire smoke through Friday
August 21, 2025
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8/19/2025 Air District and Tesoro reach $75,000 settlement with enhanced requirements for air monitoring and transparency
August 19, 2025
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8/18/2025 Air District directs Crown Hill Materials to cease operating unpermitted concrete batch plant
August 18, 2025
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8/14/2025 Air District files lawsuit against Acme Fill Corporation for illegal landfill emissions
August 14, 2025
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8/12/2025 Air District issues air quality advisory for wildfire smoke for Tuesday
August 12, 2025
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8/11/2025 Air District reaches agreement with Argent Materials to resolve air quality violations
August 11, 2025
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7/30/2025 Deadline to apply for the Air District’s Clean HEET program extended
July 30, 2025
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7/28/2025 Air District awards $3.5 million in second cycle of James Cary Smith Community Grant Program
July 28, 2025
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7/23/2025 Air District urges Bay Area to proactively prepare for smoke this wildfire season
July 23, 2025
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7/17/2025 Air District and Alameda County District Attorney announce enforcement actions against Radius Recycling, formerly Schnitzer Steel
July 17, 2025
Santa Clara County is south of the San Francisco Bay, with San Mateo and Alameda counties bordering it to the north, Santa Cruz County to the west, San Benito County to the south, and Stanislaus and Merced counties to the east. Four Santa Clara County representatives sit on the Air District’s Board of Directors.
Climate
During the summer, mostly clear skies result in warm daytime temperatures and cool nights. Winter temperatures are mild, except for very cool but generally frost-less mornings.
Further inland where the moderating effect of the bay is not as strong, temperature extremes are greater. Wind patterns are influenced by local terrain, with a northwesterly sea breeze typically developing during the daytime. Winds are usually stronger in the spring and summer. Rainfall amounts are modest, ranging from 13 inches in the lowlands to 20 inches in the hills.
Interactive Air Monitoring Stations Map
Air Quality in Santa Clara 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.
Most of Santa Clara County is well south of the cooler waters of the San Francisco Bay and far from the cooler marine air which usually reaches across San Mateo County in summer. Ozone frequently forms on hot summer days when the prevailing seasonal northerly winds carry ozone precursors southward across the county, causing health standards to be exceeded.
Santa Clara County experiences many exceedances of the PM2.5 standard each winter. This is due to the high population density, wood smoke, industrial and freeway traffic, and poor wintertime air circulation caused by extensive hills to the east and west that block wind flow into the region.
Spare the Air Status
Last Updated: 4/21/2017