Spare the Air -- Bay Area Air Quality Management District

Bay Area Five Day Air Quality Forecast

Updated Friday, May 09 at 11:36 AM

Fri	Sat	Sun	Mon	Tue
49	M	G	G	M

56	M	M	G	M

58	M	M	M	M

45	G	G	G	M

49	M	G	G	M

North Counties		Coast and Central Bay		Eastern District		South Central Bay		Santa Clara Valley
American Canyon Angwin Bel Marin Keys Boyes Hot Springs Calistoga Cotati Deer Park El Verano Eldridge Fairfax Forest Knolls Fulton Glen Ellen Graton Greenbrae Hamilton AFB Kentfield Kenwood Lagunitas Marinwood Napa Nicasio Novato Oakville Penngrove Petaluma Pope Valley Rohnert Park Ross Rutherford St. Helena San Anselmo San Geronimo San Rafael Santa Rosa Sebastopol Sonoma Vallejo Valley Ford Vineburg Windsor Woodacre Yountville		Alameda Albany Belmont Belvedere Berkeley Bolinas Brisbane Burlingame Colma Corte Madera Crockett Daly City Dillon Beach El Cerrito El Granada El Sobrante Emeryville Foster City Half Moon Bay Hercules Hillsborough Inverness Kensington La Honda Larkspur Marin City Marshall Mill Valley Millbrae Montara Moss Beach Oakland Olema Pacifica Pescadero Piedmont Pinole Point Reyes Stn. Point Richmond Richmond Rodeo San Bruno San Carlos San Francisco San Gregorio San Mateo San Pablo San Quentin Sausalito South S.F. Stinson Beach Tamalpais Vly Tiburon Tomales		Alamo Antioch Benicia Bethel Island Birds Landing Brentwood Byron Clayton Concord Cordelia Danville Diablo Discovery Bay Dublin Fairfield Lafayette Livermore Martinez Moraga Oakley Orinda Pittsburg Pleasant Hill Pleasanton Port Costa Rheem Valley San Ramon Suisun City Sunol Travis AFB Walnut Creek		Atherton Castro Valley East Palo Alto Fremont Hayward Los Altos Los Altos Hills Menlo Park Mountain View Newark Palo Alto Portola Valley Redwood City San Leandro San Lorenzo Union City Woodside		Alum Rock Alviso Campbell Coyote Cupertino Gilroy Los Gatos Milpitas Morgan Hill New Almaden Redwood Estates San Jose San Martin Santa Clara Saratoga Sunnyvale

Ozone - an odorless, colorless, oxidant gas, composed of three oxygen atoms. Ground level ozone is produced by the photochemical interaction of sunlight with hydrocarbons and oxides of nitrogen and is a major component of smog. Ozone can irritate the respiratory system, inflame lung tissue, and aggravate asthma.

AM 10 - a pungent, colorless, toxic gas. Close to the earth's surface, it is produced photochemically from hydrocarbons, oxides of nitrogen and sunlight and is a major component of smog. At very high altitudes it protects the earth from harmful ultraviolet radiation.

PM 2.5 - Particulate Matter under 2.5 micrometers in size. These are tiny solid or liquid particles, generally caused by combustion (motor vehicles, wood burning, industrial processes, etc.). The small size of the particles (about 0.0001 inches or less) allows them to penetrate deeply into the lungs where they may increase susceptibility to respiratory infections, aggravate existing respiratory conditions, and cause health problems for people with serious heart or lung disease. PM2.5 also causes visibility reduction.

PM 10 - a pungent, colorless, toxic gas. Close to the earth's surface, it is produced photochemically from hydrocarbons, oxides of nitrogen and sunlight and is a major component of smog. At very high altitudes it protects the earth from harmful ultraviolet radiation.

CO - Carbon Monoxide, a colorless, odorless gas produced when the carbon in fuels does not burn completely. Automobile exhaust can contribute up to 95 percent of carbon monoxide pollution in cities. CO concentrations in the Bay Area are generally higher in the wintertime, due to specific weather conditions and the fact that cold temperatures make combustion less complete. Carbon monoxide interferes with the blood's transportation of oxygen to organs and tissues, and can cause complications for people with cardiovascular or respiratory disease.

0 - 50
Good - No health effects.

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 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 outdoor exertion.