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  • Spare the Air Status for Saturday, September 13, 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: 09/13/25 5:00 PM PDT
      Good - 26 AQI - Ozone
      Good - 13 AQI - Particle Pollution (2.5 microns)
      Agency: Bay Area Air District
      Last Update: Sat, 13 Sep 2025 05:00:00 PST

    • Location: Fremont, CA
      Forecast: Today, 09/13/2025:
      Good - 36 AQI - Ozone
      Tomorrow, 09/14/2025:
      Good - 39 AQI - Ozone
      Monday, 09/15/2025:
      Good - 44 AQI - Ozone
      Tuesday, 09/16/2025:
      Good - Ozone
      Wednesday, 09/17/2025:
      Good - Ozone
      Agency: Bay Area Air District
      Last Update: Sat, 13 Sep 2025 05:00:02 PST


    • AQI and Pollutant Forecast for Friday by district.
      North Counties - AQI: 37, Pollutant: OZONE.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 39, Pollutant: OZONE
      South and Central Bay - AQI: 36, Pollutant: OZONE
      Santa Clara Valley - AQI: 38, Pollutant: OZONE
    • AQI and Pollutant Forecast for Saturday by district.
      North Counties - AQI: 37, Pollutant: OZONE.
      Coast and Central Bay - AQI: 39, Pollutant: PM2.5.
      Eastern District - AQI: 39, Pollutant: OZONE
      South and Central Bay - AQI: 36, Pollutant: OZONE
      Santa Clara Valley - AQI: 38, Pollutant: OZONE
    • AQI and Pollutant Forecast for Sunday by district.
      North Counties - AQI: 40, Pollutant: OZONE.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 42, Pollutant: OZONE
      South and Central Bay - AQI: 39, Pollutant: OZONE
      Santa Clara Valley - AQI: 41, Pollutant: OZONE
    • AQI and Pollutant Forecast for Monday by district.
      North Counties - AQI: 46, Pollutant: OZONE.
      Coast and Central Bay - AQI: 50, Pollutant: PM2.5.
      Eastern District - AQI: 51, Pollutant: OZONE
      South and Central Bay - AQI: 44, Pollutant: OZONE
      Santa Clara Valley - AQI: 50, Pollutant: OZONE
    • AQI and Pollutant Forecast for Tuesday by district.
      North Counties - AQI: Good, Pollutant: OZONE.
      Coast and Central Bay - AQI: Good, Pollutant: PM2.5.
      Eastern District - AQI: Moderate, Pollutant: OZONE
      South and Central Bay - AQI: Good, Pollutant: OZONE
      Santa Clara Valley - AQI: Moderate, Pollutant: OZONE