Air District Operations

The Air District is taking steps to ensure Bay Area air quality and public health are protected while the shelter-in-place orders are in effect. Permits for businesses adjusting operations to aid in the public health response will also be expedited. Read more... | en Español

About the Air District

Alameda County

About the Air District

Learn about Alameda County - its climate, potential air pollution concerns, and current air quality. You can also view upcoming Air District events in Alameda County and read about local efforts to improve air quality.

Latest News
  • May

    May 29, 2020

    Air District releases latest Ambient Air Monitoring Network Report

    The Air District has released its latest Ambient Air Monitoring Network Report, which describes the Air District’s air monitoring network for 2019, and lists proposed changes for the near future.

  • May

    May 28, 2020

    South Coast AQMD Files Lawsuit Challenging Trump Administration Rollbacks to Clean Vehicle Standards

    Today, the South Coast Air Quality Management District filed a petition challenging the U.S. EPA and the National Highway Traffic Safety Administration’s rollbacks to the Safer Affordable Fuel-Efficient Vehicles Rule initiated by the Trump Administration. The Bay Area Air Quality Management District and the Sacramento Metropolitan Air Quality Management District have joined South Coast AQMD as co-petitioners.

  • May

    May 24, 2020

    Air District issues first Spare the Air Alert for smog this year

    Today, the Bay Area Air Quality Management District is issuing the first Spare the Air Alert for smog in 2020. Air quality is forecast to be unhealthy tomorrow, Memorial Day, Monday, May 25. Light winds combined with triple-digit inland temperatures and vehicle exhaust are expected to cause unhealthy smog, or ozone, accumulation in the Bay Area.

Alameda County lies east of the San Francisco Bay, bounded by Contra Costa Bay to the north, San Joaquin County to the east, and Santa Clara County to the south. Four representatives sit on the Air District’s Board of Directors.


Along the county’s western coast, temperatures are moderated by the bay, which can act as a heat source during cold weather, or cool the air by evaporation during warm weather. It is generally sunnier farther from the coast, although partly cloudy skies are common throughout the summer. Average summer temperatures are mild overnight and moderate during the day. Winter temperatures are cool overnight and mild during the day. Highest temperatures are more common inland. Wind speeds vary throughout the county, with the strongest gusts along the western coast, often aided by dominant westerly winds and a bay-breeze effect. Rainfall totals average about 14 to 23 inches per year, with the highest totals in the northern end of the county and atop the Oakland-Berkeley hills.

Alameda County’s climate is also affected by regional Bay Area climate influences.

Interactive Air Monitoring Stations Map

Air Quality in Alameda 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 Alameda County west of the East Bay hills, ozone rarely exceeds health standards because the area is adjacent to San Francisco Bay, which tends to keep temperatures well below prime levels for ozone formation.  PM2.5 is a more significant issue in this region due to cool winter nights with light winds, wood smoke, and occasional pollution transport from the Livermore Valley to the east.

Eastern Alameda County has the highest ozone levels in the Bay Area, with summer afternoon temperatures frequently approaching triple digits, spurring ozone levels to exceed health standards. In winter, PM2.5 can be transported westward through the Altamont Pass from the Central Valley where it adds to wood smoke levels, causing health standards to be exceeded.

Interactive Air Quality Forecast Map

Resource Team

Alameda County Spare the Air Resource Team promotes various ways to reduce air pollution in the local community.

Spare the Air Status
No Wood Burning
Spare the Air Status
  • Saturday,

    No Spare the Air Alert in Effect

Last Updated: 2/14/2019