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  • Spare the Air Status for Saturday, October 25, 2025

    No Spare the Air Alert in Effect
AIRNow Alerts - San Francisco Bay Area AQMD


    Union City, CA Current AQI (PurpleAir Sensor)



    Union City Current AQI

    Realtime PurpleAir Sensor Map

    PurpleAir Sensor Map courtesy of PurpleAir.com




    • Location: Fremont, CA
      Current Air Quality: 10/25/25 5:00 PM PDT
      Good - 28 AQI - Ozone
      Good - 12 AQI - Particle Pollution (2.5 microns)
      Agency: Bay Area Air District
      Last Update: Sat, 25 Oct 2025 04:45:02 PST

    • Location: Fremont, CA
      Forecast: Today, 10/25/2025:
      Good - 33 AQI - Particle Pollution (2.5 microns)
      Tomorrow, 10/26/2025:
      Good - 39 AQI - Particle Pollution (2.5 microns)
      Monday, 10/27/2025:
      Good - 39 AQI - Particle Pollution (2.5 microns)
      Tuesday, 10/28/2025:
      Good - Particle Pollution (2.5 microns)
      Wednesday, 10/29/2025:
      Good - Particle Pollution (2.5 microns)
      Agency: Bay Area Air District
      Last Update: Sat, 25 Oct 2025 04:45:04 PST


    • AQI and Pollutant Forecast for Friday by district.
      North Counties - AQI: 50, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 53, Pollutant: PM2.5.
      Eastern District - AQI: 44, Pollutant: PM2.5
      South and Central Bay - AQI: 39, Pollutant: PM2.5
      Santa Clara Valley - AQI: 53, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Saturday by district.
      North Counties - AQI: 28, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 39, Pollutant: PM2.5
      South and Central Bay - AQI: 33, Pollutant: PM2.5
      Santa Clara Valley - AQI: 50, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Sunday by district.
      North Counties - AQI: 28, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 50, Pollutant: PM2.5.
      Eastern District - AQI: 33, Pollutant: PM2.5
      South and Central Bay - AQI: 39, Pollutant: PM2.5
      Santa Clara Valley - AQI: 53, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Monday by district.
      North Counties - AQI: 39, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 53, Pollutant: PM2.5.
      Eastern District - AQI: 39, Pollutant: PM2.5
      South and Central Bay - AQI: 39, Pollutant: PM2.5
      Santa Clara Valley - AQI: 53, 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: Moderate, Pollutant: PM2.5