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  • Spare the Air Status for Tuesday, March 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
      Forecast: Today, 03/26/2025:
      AQI: Moderate (51 - 100)
      Moderate - 53 AQI - Particle Pollution (2.5 microns)
      Tomorrow, 03/27/2025:
      Good - 44 AQI - Particle Pollution (2.5 microns)
      Thursday, 03/27/2025:
      Good - Particle Pollution (2.5 microns)
      Friday, 03/28/2025:
      Good - Particle Pollution (2.5 microns)
      Saturday, 03/29/2025:
      Good - Particle Pollution (2.5 microns)
      Sunday, 03/30/2025:
      Good - Particle Pollution (2.5 microns)
      Agency: Bay Area Air District
      Last Update: Tue, 25 Mar 2025 09:45:02 PST


    • AQI and Pollutant Forecast for Tuesday by district.
      North Counties - AQI: 64, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 68, Pollutant: PM2.5.
      Eastern District - AQI: 62, Pollutant: PM2.5
      South and Central Bay - AQI: 53, Pollutant: PM2.5
      Santa Clara Valley - AQI: 68, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Wednesday by district.
      North Counties - AQI: 44, Pollutant: PM2.5.
      Coast and Central Bay - AQI: 56, Pollutant: PM2.5.
      Eastern District - AQI: 43, Pollutant: OZONE
      South and Central Bay - AQI: 44, Pollutant: PM2.5
      Santa Clara Valley - AQI: 55, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Thursday by district.
      North Counties - AQI: Good, Pollutant: PM2.5.
      Coast and Central Bay - AQI: Good, Pollutant: PM2.5.
      Eastern District - AQI: Good, Pollutant: PM2.5
      South and Central Bay - AQI: Good, Pollutant: PM2.5
      Santa Clara Valley - AQI: Good, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Friday by district.
      North Counties - AQI: Good, Pollutant: PM2.5.
      Coast and Central Bay - AQI: Good, Pollutant: PM2.5.
      Eastern District - AQI: Good, Pollutant: PM2.5
      South and Central Bay - AQI: Good, Pollutant: PM2.5
      Santa Clara Valley - AQI: Good, Pollutant: PM2.5
    • AQI and Pollutant Forecast for Saturday by district.
      North Counties - AQI: Good, Pollutant: PM2.5.
      Coast and Central Bay - AQI: Good, Pollutant: PM2.5.
      Eastern District - AQI: Good, Pollutant: PM2.5
      South and Central Bay - AQI: Good, Pollutant: PM2.5
      Santa Clara Valley - AQI: Good, Pollutant: PM2.5