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California
Air Quality

See air quality in your area in near-real time. This map shows ratings for the Bay Area and California, updated hourly.

EPA monitoring stations are shown on the map only when air-quality levels of “unhealthy” or worse are detected.

About the Data

Air Quality Layers

Air Quality Index (AQI) data and severity categories come from the EPA's AirNow site. The categories are:

"Moderate" AQI is 51 to 100. Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people. For example, people who are unusually sensitive to ozone may experience respiratory symptoms.

"Unhealthy for Sensitive Groups" AQI is 101 to 150. Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

"Unhealthy" AQI is 151 to 200. Everyone may begin to experience some adverse health effects, and members of the sensitive groups may experience more serious effects.

"Very Unhealthy" AQI is 201 to 300. This would trigger a health alert signifying that everyone may experience more serious health effects.

"Hazardous" AQI greater than 300. This would trigger a health warnings of emergency conditions. The entire population is more likely to be affected.

Wind Data

Wind Data comes from the National Centers for Environmental Prediction. This information is updated every 6 hours.


2019

Fires We're Tracking

Click on the fires below to learn more about each fire's timeline

Mountain Fire

Shasta County
Shasta CountyCAUS

Started: August 22, 2019

Containment: 40%

Description: A wildfire is burning off Bear Mountain Road and Dry Creek Road, north of Bella Vista in Shasta County. Evacuations and road closures are in place.

Past Fires

2019

Sand Fire

Yolo County
Yolo CountyCAUS

Started: June 8, 2019

Containment: 100%

Damage: 7 structures destroyed

Description: Seven structures were destroyed and two people suffered minor injuries after a rapidly spreading fire burned over 2,500 acres near the town of Guinda.

McMillan Fire

San Luis Obispo County
San Luis Obispo CountyCAUS

Started: June 12, 2019

Containment: 100%

Description: A vegetation fire in San Luis Obispo County has been contained after spreading to 1,764 acres.

Lonoak Fire

Monterey County
Monterey CountyCAUS

Started: June 25, 2019

Containment: 100%

Description: Forward spread of fire has been stopped.

Rock Fire

Stanislaus County
Stanislaus CountyCAUS

Started: June 25, 2019

Containment: 100%

Description: The fire has been contained, but Del Puerto Canyon Rd remains closed.

Hollow Fire

San Joaquin County
San Joaquin CountyCAUS

Started: July 3, 2019

Containment: 100%

Description: The Hollow Fire started July 3, 2019 off West Corral Hollow Road, Carnegie State Vehicular Recreational Area, southwest of Tracy in San Joaquin County.

Gillis Fire

San Luis Obispo County
San Luis Obispo CountyCAUS

Started: July 8, 2019

Containment: 100%

Description: The Gillis Fire started July 8, 2019 off Gillis Canyon and South East of Shandon in San Luis Obispo County.

Tucker Fire

Modoc County
Modoc CountyCAUS

Started: July 28, 2019

Containment: 100%

Description: Crews are continuing to make good progress securing containment lines around the Tucker Fire. No structures have been damaged or destroyed.

Marsh Complex

Contra Costa County
Contra Costa CountyCAUS

Started: August 3, 2019

Containment: 100%

Description: Firefighters took control of eight separate vegetation fires that had burned 757 acres near Clayton.

W1 Fire

Lassen County
Lassen CountyCAUS

Started: August 8, 2019

Containment: 100%

Description: The W1 Fire started on August 8 2019 near Cold Springs Rd and McDonald Peak, 11 miles southeast of Madeline Lassen County. It has been contained after burning high desert grasses, brush and juniper.

Border 8 Fire

Mexico
MexicoCAUS

Started: August 16, 2019

Containment: 100%

Description: A Cal Fire strike team was sent to help Mexican fire crews with a 1,500-acre blaze at the border.

Gaines Fire

Mariposa County
Mariposa CountyCAUS

Started: August 16, 2019

Containment: 100%

Description: The Gaines Fire sparked near Mt. Gaines Road and Bear Valley Road in Bear Valley.


In-Depth: Chronicle Wildfire Coverage

Credits

Reporter

Kimberly Veklerov • kveklerov@sfchronicle.com  • @KVeklerov

Newsroom Developers

Evan Wagstaff • evan.wagstaff@sfchronicle.com  • @EvanWagstaff

Lucio Villa • lvilla@sfchronicle.com  • @luciovilla

Contributing Developer

Jeremy Rue • jrue@berkeley.edu  • @jrue

Data Developer

Clint Wirtanen • cwirtanen@sfchronicle.com  • @ClintWirtanen

Executive Producer

Brittany Schell • bschell@sfchronicle.com  • @brittlynns

Managing Editor, Enterprise

Michael Gray • mgray@sfchronicle.com  • @GrayMikeG

Managing Editor, Digital

Tim O'Rourke • torourke@sfchronicle.com  • @TimothyORourke

Editor In Chief

Audrey Cooper • acooper@sfchronicle.com  • @audreycoopersf