Contra Costa Air Quality

5 County Map
Air quality forecast as of November 20, 2017
North Counties
Coast and Central Bay
Eastern District
South and Central Bay
Santa Clara Valley

Bay Area Air Quality Index

The Air Quality Index, or AQI, much like an air quality “thermometer,” translates daily air pollution concentrations into a number on a scale between 0 and 500. The numbers in this scale are divided into six color-coded ranges, with numbers from 0 to 300.

(0–50) Good
No health impacts are expected when air quality is in this range.
(51–100) Moderate
Unusually sensitive people should consider limiting prolonged outdoor exertion.
(101–150) Unhealthy for sensitive groups
Active children and adults, and people with respiratory disease, such as asthma, should limit outdoor exertion.
(151–200) Unhealthy
Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion. Everyone else, especially children, should limit prolonged outdoor exertion.
(201–300) Very unhealthy
Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion. Everyone else, especially children, should limit any outdoor exertion.

Stay informed!

Planning to bike to work or walk to school? Be sure to check the latest air quality alerts and forecasts before you head out! Bookmark this this page for forecasts, sign up for Spare the Air notifications via phone or email.

Spare the air and make a difference

During those hazy, hot summer months, nearly 40% of all pollution comes from automobiles – and it’s more important than ever for you to take action. Spare the Air is here to help! A regional program sponsored by the Bay Area Air Quality Management District with the support of partners, including 511 Contra Costa, Spare the Air lets you know whenever summer pollution threatens to reach concentrations harmful to your health.

Sign up now for email alerts and become part of the solution. If you get an alert, it’s important for you to act by altering your commuting habits by ridesharing or telecommuting. Although automobiles are the largest smog source, you can also cut pollution by avoiding the use of aerosol personal care and cleaning products and postponing painting projects and garden tasks that use gasoline-powered equipment. If you’re planning a barbecue, start the coals in a chimney or with an electric starter instead of with lighter fluid. There are tons of other simple yet creative ways you can help.

The Spare the Air season begins in June and runs through October each year.

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