California Air Quality Today: AQI by City, Smoke and Alerts

Fine particles on the map

Forecast fine particulate matter from NOAA’s National Air Quality Forecast Capability over California. Open it for the live map, where it pans and zooms.

Open the live map with the particulate forecast

Map layer from NOAA National Air Quality Forecast Capability. Boundaries from the Iowa Environmental Mesonet.

Alerts in force

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

None are in force in California right now. All California warnings.

By city, now and the days ahead161

Every AirNow reporting area in California: what its monitors measured this hour, and what the state or local agency that forecasts for it expects today and tomorrow. Each area links to the nearest town’s page.

Reporting area	Now	Category now	Today	Tomorrow	Pollutant
Yosemite National Park	153	Unhealthy	Not forecast	Not forecast	PM2.5
Calexico	106	Unhealthy for Sensitive Groups	Moderate	Moderate	PM2.5
Imperial Valley	106	Unhealthy for Sensitive Groups	Moderate	Moderate	PM2.5
Banning	65	Moderate	Moderate	Not forecast	PM2.5
Bakersfield	63	Moderate	Moderate	Not forecast	PM10
Coachella Vly	63	Moderate	Moderate	Not forecast	PM2.5
Fresno	63	Moderate	Moderate	Not forecast	PM2.5
South Coastal LA	63	Moderate	Good	Not forecast	PM2.5
Metro Riverside CO	61	Moderate	Moderate	Not forecast	PM2.5
Visalia	61	Moderate	Moderate	Not forecast	PM2.5
Hanford	59	Moderate	Moderate	Not forecast	PM2.5
Border Area	58	Moderate	Not forecast	Not forecast	PM2.5
Central Orange	57	Moderate	Moderate	Not forecast	PM2.5
San Diego Coast	57	Moderate	Good	Not forecast	PM2.5
Santa Clarita Vly	57	Moderate	Moderate	Not forecast	PM2.5
C San Bernardino	56	Moderate	Unhealthy for Sensitive Groups	Not forecast	PM2.5
Modesto	55	Moderate	Good	Not forecast	PM2.5
Victorville	55	Moderate	Moderate	Not forecast	PM2.5
Carmel Valley	54	Moderate	Moderate	Good	PM2.5
Joshua Tree National Park	54	Moderate	Not forecast	Not forecast	Ozone
Merced	54	Moderate	Moderate	Not forecast	PM2.5
San Diego Foothills	54	Moderate	Good	Not forecast	Ozone
Davis	53	Moderate	Good	Good	PM2.5
E San Fernando Vly	53	Moderate	Moderate	Not forecast	PM2.5
E San Gabriel Vly	53	Moderate	Moderate	Not forecast	PM2.5
Folsom	53	Moderate	Good	Moderate	PM2.5
S Central LA CO	53	Moderate	Moderate	Not forecast	PM2.5
Simi Valley	53	Moderate	Moderate	Good	PM2.5
Madera	52	Moderate	Moderate	Not forecast	PM2.5
Antelope Vly	51	Moderate	Moderate	Not forecast	PM2.5
Barstow	51	Moderate	Moderate	Not forecast	PM10
Lake Elsinore	51	Moderate	Moderate	Not forecast	PM2.5
San Diego Mesa and Inland Valley	51	Moderate	Good	Not forecast	PM2.5
Santa Maria	51	Moderate	Moderate	Good	PM2.5
San Lorenzo Valley	50	Good	Moderate	Good	PM2.5
Niland	49	Good	Moderate	Moderate	PM10
Central LA CO	48	Good	Moderate	Not forecast	PM2.5
Morro Bay	48	Good	Good	Good	PM2.5
Red Hills	47	Good	Good	Good	Ozone
Saddleback Vly	47	Good	Good	Not forecast	PM2.5
Carpinteria	46	Good	Moderate	Good	PM2.5
King City	45	Good	Moderate	Good	PM2.5
Brawley	44	Good	Moderate	Moderate	PM10
El Centro	44	Good	Moderate	Moderate	PM10
San Jose	43	Good	Good	Moderate	PM2.5
Santa Cruz	43	Good	Moderate	Good	PM2.5
Westmorland	43	Good	Moderate	Moderate	PM10
W San Fernando Vly	42	Good	Moderate	Not forecast	PM2.5
Gridley	41	Good	Moderate	Moderate	PM2.5
Roseville-Rocklin	41	Good	Good	Moderate	PM2.5
Sequoia and Kings Canyon National Parks	41	Good	Good	Not forecast	PM2.5
Hesperia	39	Good	Moderate	Not forecast	Ozone
Lassen Volcanic National Park	39	Good	Not forecast	Not forecast	Ozone
Nipomo CDF	39	Good	Good	Good	PM2.5
Salinas	39	Good	Moderate	Good	PM2.5
Chico	38	Good	Good	Moderate	PM2.5
Livermore	38	Good	Good	Good	PM2.5
Stockton	38	Good	Good	Not forecast	PM2.5
Ukiah	38	Good	Not forecast	Not forecast	PM2.5
Yuba City and Marysville	38	Good	Good	Moderate	Ozone
Death Valley National Park	37	Good	Good	Not forecast	Ozone
Oxnard	37	Good	Moderate	Good	PM2.5
Santa Ynez	37	Good	Good	Good	PM2.5
Napa	36	Good	Good	Good	PM2.5
NW Coastal LA	36	Good	Good	Not forecast	Ozone
Western Nevada County	36	Good	Not forecast	Not forecast	Ozone
North Orange CO	35	Good	Moderate	Not forecast	Ozone
S San Gabriel Vly	35	Good	Moderate	Not forecast	Ozone
C San Bernardino M	34	Good	Unhealthy for Sensitive Groups	Not forecast	Ozone
Mojave	34	Good	Not forecast	Not forecast	Ozone
Willits	34	Good	Not forecast	Not forecast	PM2.5
Paradise	33	Good	Good	Moderate	Ozone
Auburn	32	Good	Good	Moderate	Ozone
Ojai	32	Good	Good	Good	PM2.5
Arden Arcade-Del Paso Manor	31	Good	Good	Moderate	PM2.5
Natomas	31	Good	Good	Moderate	PM2.5
Nipomo Mesa2	31	Good	Good	Good	PM2.5
North Highlands	31	Good	Good	Moderate	PM2.5
Sacramento	31	Good	Good	Moderate	PM2.5
Sloughhouse	31	Good	Good	Moderate	PM2.5
Lompoc	30	Good	Good	Good	Ozone
Pechanga Indian Reservation	30	Good	Not forecast	Not forecast	PM2.5
Colfax	29	Good	Good	Moderate	Ozone
Lincoln	28	Good	Good	Moderate	PM2.5
Redding	28	Good	Not forecast	Not forecast	Ozone
Tuolumne County	28	Good	Not forecast	Not forecast	Ozone
W San Gabriel Vly	28	Good	Moderate	Not forecast	Ozone
Bishop	27	Good	Not forecast	Not forecast	PM2.5
Calaveras County	27	Good	Not forecast	Not forecast	Ozone
Gaviota Coast	27	Good	Good	Good	Ozone
Oakland	27	Good	Good	Moderate	Ozone
Tahoe City area	27	Good	Not forecast	Not forecast	Ozone
Willows	27	Good	Not forecast	Not forecast	PM2.5
Elk Grove	26	Good	Good	Moderate	PM2.5
Fremont	26	Good	Good	Good	Ozone
Redwood City	26	Good	Good	Good	PM2.5
San Francisco	26	Good	Good	Moderate	PM2.5
Carrizo Plains	25	Good	Good	Good	Ozone
Concord	25	Good	Good	Good	Ozone
Owens Lake	25	Good	Not forecast	Not forecast	PM10
Placerville	25	Good	Good	Moderate	Ozone
Red Bluff	25	Good	Not forecast	Not forecast	Ozone
Nipomo	24	Good	Good	Good	Ozone
Atascadero	23	Good	Good	Good	PM2.5
Trona	23	Good	Good	Not forecast	Ozone
Thousand Oaks	22	Good	Moderate	Good	Ozone
Yreka	22	Good	Not forecast	Not forecast	Ozone
Fairfield	20	Good	Good	Good	Ozone
Santa Rosa	20	Good	Good	Good	Ozone
Temecula Vly	20	Good	Good	Not forecast	Ozone
Vacaville	20	Good	Good	Good	Ozone
Blythe	18	Good	Not forecast	Not forecast	Ozone
Paso Robles	18	Good	Good	Good	PM10
Pinnacles National Monument	17	Good	Good	Good	Ozone
Piru	17	Good	Moderate	Good	Ozone
E San Bernardino	14	Good	Moderate	Not forecast	Ozone
Lee Vining	14	Good	Not forecast	Not forecast	PM2.5
Mono Lake	14	Good	Not forecast	Not forecast	PM2.5
Coso Junction	13	Good	Not forecast	Not forecast	PM10
Woodland	13	Good	Good	Good	Ozone
Olancha	12	Good	Not forecast	Not forecast	PM10
Paradise Road	12	Good	Good	Good	Ozone
Truckee	12	Good	Not forecast	Not forecast	PM2.5
Weaverville	12	Good	Not forecast	Not forecast	PM2.5
Cool	11	Good	Good	Moderate	Ozone
Lone Pine	11	Good	Not forecast	Not forecast	PM10
Big Bear Lake	9	Good	Moderate	Not forecast	PM2.5
Portola	8	Good	Good	Good	PM2.5
Quincy	6	Good	Not forecast	Not forecast	PM2.5
South Lake Tahoe	6	Good	Not forecast	Not forecast	PM10
Eureka	5	Good	Not forecast	Not forecast	PM10
Fort Bragg	1	Good	Not forecast	Not forecast	PM10
Anza Vly		No reading	Good	Not forecast	Ozone
Capistrano Vly		No reading	Good	Not forecast	Ozone
Central Coastal		No reading	Good	Not forecast	Ozone
Davenport		No reading	Good	Good	PM2.5
East Riverside CO		No reading	Good	Not forecast	Ozone
Goleta		No reading	Moderate	Good	PM2.5
Hemet and San Jacinto		No reading	Moderate	Not forecast	PM2.5
Hollister		No reading	Moderate	Good	PM2.5
Marina and Seaside		No reading	Moderate	Good	PM2.5
Monterey Peninsula		No reading	Moderate	Good	PM2.5
N Coastal Orange		No reading	Good	Not forecast	Ozone
Norco and Corona		No reading	Moderate	Not forecast	Ozone
NW San Bernardino		No reading	Moderate	Not forecast	Ozone
Perris Vly		No reading	Moderate	Not forecast	Ozone
Phelan		No reading	Moderate	Not forecast	Ozone
Pomona Walnut Vly		No reading	Moderate	Not forecast	Ozone
Rio Vista		No reading	Good	Good	Ozone
San Gabriel Mts		No reading	Moderate	Not forecast	Ozone
San Luis Obispo		No reading	Good	Good	Ozone
San Rafael		No reading	Good	Good	Ozone
Santa Barbara		No reading	Moderate	Good	PM2.5
Scotts Valley		No reading	Moderate	Good	PM2.5
Southeast LA CO		No reading	Moderate	Not forecast	PM2.5
SW Coastal LA		No reading	Good	Not forecast	PM2.5
SW San Bernardino		No reading	Moderate	Not forecast	Ozone
Twentynine Palms		No reading	Good	Not forecast	Ozone
W San Bernardino M		No reading	Moderate	Not forecast	Ozone
Watsonville		No reading	Moderate	Good	PM2.5
Yucca Vly		No reading	Good	Not forecast	Ozone

The forecaster’s discussion

Written by Imperial County Air Pollution Control District for Calexico and filed with AirNow.

Today, pollutant carryover is low after the gusty conditions Friday evening. However, light westerly to north-northwesterly winds will hinder dispersion throughout the day. Furthermore, mostly sunny skies and triple-digit heat will aid ozone development. As a result, AQI levels will be Moderate. Tomorrow, light southeasterly winds will reduce dispersion and gradually carry regional pollutants into the Imperial Valley. Furthermore, mostly sunny and warm conditions will enhance ozone formation, leading to high-Moderate ozone levels.

Smoke

NOAA’s analysts have not drawn wildfire smoke over any town in California today.

Smoke on the radar over California

What this means

The index runs from 0 to 500. Good is 0 to 50, Moderate to 100, Unhealthy for Sensitive Groups to 150, Unhealthy to 200, Very Unhealthy to 300, and Hazardous above that. The figure reported for a place is the highest index among the pollutants measured there, and the pollutant that produced it is named beside it.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

Towns

Air quality for any town in California: what is measured nearby, the category forecast for today and tomorrow, and NOAA’s model hour by hour. Largest first.

913 smaller towns

Smaller places have pages too; search for one on the air quality landing page.

Sources

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.