The Air District will host an in-person conversation with Air District Board Chair Davina Hurt on Saturday, December 7, 2024, from 12 noon – 1 PM at the Greenhouse Community Room in the San Lorenzo Public Library. The conversation will focus on community questions and concerns regarding air quality issues and climate change.
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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 to represent Bay Area at COP29November 12, 2024
The Air District is sending representatives to attend the United Nations Climate Change Conference, or COP29, in Baku, Azerbaijan from November 11 through November 22. Air District Board of Directors Chair Davina Hurt and Executive Officer Dr. Philip Fine will hold a virtual press conference on Tuesday, November 19 at 10 AM. Bay Area residents are invited to join the discussion, ask questions and share their concerns by connecting with the Air District on Facebook during the livestream press conference.
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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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October 25, 2024
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October 18, 2024
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October 17, 2024
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Upcoming Events
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Other News Articles
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10/17/2024 Air District fines Radius Recycling, formerly Schnitzer Steel, $575,000 for air quality violations
October 17, 2024
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10/8/2024 Air District issues air quality advisory for Novato
October 8, 2024
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10/8/2024 Air District to host Building Appliance Rules learning session on October 22
October 8, 2024
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10/7/2024 Air District to host public meeting on Radius Recycling permit application
October 7, 2024
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10/7/2024 Air District’s James Cary Smith Community Grant Program uplifts Bay Area communities
October 7, 2024
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10/5/2024 Air District extends Spare the Air Alert through Sunday
October 5, 2024
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10/4/2024 Air District issues Spare the Air Alert for Saturday
October 4, 2024
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10/2/2024 Air District extends Spare the Air Alert through Thursday
October 2, 2024
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10/2/2024 Air District fines Marathon Martinez Refinery $5 million
October 2, 2024
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10/2/2024 Air District releases annual Air Toxics Report and online Facility Toxic Emissions and Prioritization Tool
October 2, 2024
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10/1/2024 Air District extends Spare the Air Alert through Wednesday
October 1, 2024
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10/1/2024 Regional Agencies Mark Milestone in the Mandatory Bay Area Commuter Benefits Program
October 1, 2024
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10/1/2024 Air District offers $90 million in grants to reduce toxic air pollution from heavy-duty diesel engines
October 1, 2024
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