Air Quality Informaton
- Spare the Air Status for Sunday, October 05, 2025
No Spare the Air Alert in Effect
AIRNow Alerts - San Francisco Bay Area AQMD
Union City, CA Current AQI (PurpleAir Sensor)

Realtime PurpleAir Sensor Map
PurpleAir Sensor Map courtesy of PurpleAir.com
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Northern Section: Burn
Southern Section: Burn
Coastal Section: Burn -
Northern Section: Burn
Southern Section: Burn
Coastal Section: Burn
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Location: Fremont, CACurrent Air Quality: 10/05/25 2:00 AM PDTGood - 19 AQI - Ozone
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Agency: Bay Area Air DistrictLast Update: Sun, 05 Oct 2025 01:15:01 PST
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Location: Fremont, CAForecast: Today, 10/05/2025:Good - 33 AQI - Particle Pollution (2.5 microns)
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Tomorrow, 10/06/2025:Good - 28 AQI - Particle Pollution (2.5 microns)>
Tuesday, 10/07/2025:Good - Particle Pollution (2.5 microns)>
Wednesday, 10/08/2025:Good - Particle Pollution (2.5 microns)>
Agency: Bay Area Air DistrictLast Update: Sun, 05 Oct 2025 01:15:03 PST
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AQI and Pollutant Forecast for Friday by district.
North Counties - AQI: 17, Pollutant: PM2.5.
Coast and Central Bay - AQI: 33, Pollutant: PM2.5.
Eastern District - AQI: 22, Pollutant: PM2.5
South and Central Bay - AQI: 17, Pollutant: PM2.5
Santa Clara Valley - AQI: 28, Pollutant: PM2.5 -
AQI and Pollutant Forecast for Saturday by district.
North Counties - AQI: 28, Pollutant: PM2.5.
Coast and Central Bay - AQI: 50, Pollutant: PM2.5.
Eastern District - AQI: 37, Pollutant: OZONE
South and Central Bay - AQI: 33, Pollutant: PM2.5
Santa Clara Valley - AQI: 44, Pollutant: PM2.5 -
AQI and Pollutant Forecast for Sunday by district.
North Counties - AQI: 33, Pollutant: PM2.5.
Coast and Central Bay - AQI: 53, Pollutant: PM2.5.
Eastern District - AQI: 39, Pollutant: OZONE
South and Central Bay - AQI: 33, Pollutant: PM2.5
Santa Clara Valley - AQI: 53, Pollutant: PM2.5 -
AQI and Pollutant Forecast for Monday by district.
North Counties - AQI: 33, Pollutant: PM2.5.
Coast and Central Bay - AQI: 53, Pollutant: PM2.5.
Eastern District - AQI: 42, Pollutant: OZONE
South and Central Bay - AQI: 28, Pollutant: PM2.5
Santa Clara Valley - AQI: 50, Pollutant: PM2.5 -
AQI and Pollutant Forecast for Tuesday by district.
North Counties - AQI: Good, Pollutant: PM2.5.
Coast and Central Bay - AQI: Moderate, Pollutant: PM2.5.
Eastern District - AQI: Good, Pollutant: OZONE
South and Central Bay - AQI: Good, Pollutant: PM2.5
Santa Clara Valley - AQI: Good, Pollutant: PM2.5