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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Napa County
Learn about Napa County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Napa County and read about local efforts to improve air quality.
Napa County is nestled in a valley between the Maycamas Mountains in the west and the Vaca Mountains in the east. One Napa County representative sits 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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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
The mountains bordering Napa Valley block much of the prevailing northwesterly winds throughout the year. Sunshine is plentiful in Napa County, and summertime can be very warm in the valley, particularly in the northern end. Winters are usually mild, with cool temperatures overnight and mild-to-moderate temperatures during the day. Wintertime temperatures tend to be slightly cooler in the northern end of the valley. Winds are generally calm throughout the county. Annual precipitation averages range from about 24 inches in low elevations to more than 40 inches in the mountains.
Interactive Air Monitoring Stations Map
Air Quality in Napa 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 Napa County, ozone rarely exceeds health standards, but PM2.5 occasionally does reach unhealthy concentrations. There are multiple reasons for PM2.5 exceedances in Napa County. First, much of the county is wind-sheltered, which tends to trap PM2.5 within the Napa Valley.
Second, much of the area is well north of the moderating temperatures of San Pablo Bay and, as a result, Napa County experiences some of the coldest nights in the Bay Area. This leads to greater fireplace use and, in turn, higher PM2.5 levels. Finally, in the winter easterly winds often move fine-particle-laden air from the Central Valley to the Carquinez Strait and then into western Solano and southern Napa County.
Spare the Air Status
Last Updated: 4/21/2017