Air District Board Chair Davina Hurt and Executive Officer Dr. Philip Fine, will co-host a live virtual media availability from COP29 in Baku, Azerbaijan, on Tuesday, November 19, at 10 AM. The media availability will include a brief overview of the Air District’s goals and insights from the conference as well as time for questions from the media.
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A Healthy Breathing Environment For Every Bay Area Resident
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Contra Costa County
Learn about Contra Costa County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Contra Costa County and read about local efforts to improve air quality.
Contra Costa County lies east of the San Pablo Bay, bounded by Alameda County to the south, San Joaquin County to the east, and Solano and Sacramento counties to the north. Four representatives sit on the Air District’s Board of Directors.
Latest News
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Air District releases woodsmoke white paper for public commentNovember 06, 2024
The Air District has released a woodsmoke White Paper for public comment, which provides extensive information on wood burning in the Bay Area, the current state of the regulatory landscape for wood-burning devices, and a discussion of potential recommendations to further minimize woodsmoke emissions and exposures.
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Air District and CARB fine Valero Refining Co. $82 million for air quality violationsOctober 31, 2024
The Air District and the California Air Resources Board are announcing a nearly $82 million penalty in a joint case to address significant air pollution violations by Valero Refining Co. at its Benicia refinery. This penalty is the largest ever assessed in the Air District’s history.
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Air District issues air quality advisory for Friday and SaturdayOctober 25, 2024
The Air District is issuing an air quality advisory due to smoke for Friday, October 25 and Saturday, October 26. Smoke from prescribed fires near Pescadero may impact air quality along the Peninsula – south of San Francisco and north of San Jose. Conditions can change rapidly and the amount and location of smoke at ground level is hard to predict.
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October 18, 2024
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October 17, 2024
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Other News Articles
Climate
Temperatures in and around the San Ramon and Diablo Valleys are warm in the summer and cool in the winter, largely because of their distance from the moderating effect of water bodies and because the California Coast Range blocks marine air flow into the valleys. The Carquinez Strait region remains temperate due to its proximity to water and oceanic air flows. In winter, average daily temperatures are mild, with tule fog common at night. Average summer temperatures are typically mild overnight and warm during the day, with cooler temperatures and stronger winds more common along the western coast. Wind speeds are generally low throughout the region and winds typically blow from northwest to southwest. However, strong afternoon gusts are common in the northern portion of the county around the Carquinez Strait. Annual rainfall averages between 18 and 23 inches across the county.
Interactive Air Monitoring Stations Map
Air Quality in Contra Costa 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.
Ozone and PM2.5 infrequently exceed health standards in the portion of Contra Costa County west of the East Bay hills. The San Francisco Bay keeps air temperatures above freezing in winter and well below 100 degrees on even the warmest summer days.
In eastern Contra Costa County, summer afternoon temperatures frequently approach triple digits, spurring ozone levels to exceed health standards. In winter, PM2.5 can be transported westward through the Carquinez Strait from the Central Valley where it adds to wood smoke, causing health standards to be exceeded.
Spare the Air Status
Last Updated: 4/21/2017