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  • Spare the Air Status for Saturday, April 19, 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: 04/19/25 12:00 AM PDT
      Good - 38 AQI - Particle Pollution (2.5 microns)
      Good - 31 AQI - Ozone
      Agency: Bay Area Air District
      Last Update: Fri, 18 Apr 2025 11:30:02 PST

    • Location: Fremont, CA
      Forecast: Today, 04/19/2025:
      Good - 42 AQI - Ozone
      Tomorrow, 04/20/2025:
      Good - 41 AQI - Ozone
      Sunday, 04/20/2025:
      Good - 42 AQI - Ozone
      Monday, 04/21/2025:
      Good - 43 AQI - Ozone
      Tuesday, 04/22/2025:
      Good - Ozone
      Wednesday, 04/23/2025:
      Good - Ozone
      Agency: Bay Area Air District
      Last Update: Fri, 18 Apr 2025 11:30:04 PST


    • AQI and Pollutant Forecast for Friday by district.
      North Counties - AQI: 43, Pollutant: OZONE.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 45, Pollutant: OZONE
      South and Central Bay - AQI: 42, Pollutant: OZONE
      Santa Clara Valley - AQI: 44, Pollutant: OZONE
    • AQI and Pollutant Forecast for Saturday by district.
      North Counties - AQI: 42, Pollutant: OZONE.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 44, Pollutant: OZONE
      South and Central Bay - AQI: 41, Pollutant: OZONE
      Santa Clara Valley - AQI: 43, Pollutant: OZONE
    • AQI and Pollutant Forecast for Sunday by district.
      North Counties - AQI: 43, Pollutant: OZONE.
      Coast and Central Bay - AQI: 50, Pollutant: PM2.5.
      Eastern District - AQI: 45, Pollutant: OZONE
      South and Central Bay - AQI: 42, Pollutant: OZONE
      Santa Clara Valley - AQI: 44, Pollutant: OZONE
    • AQI and Pollutant Forecast for Monday by district.
      North Counties - AQI: 44, Pollutant: OZONE.
      Coast and Central Bay - AQI: 44, Pollutant: PM2.5.
      Eastern District - AQI: 46, Pollutant: OZONE
      South and Central Bay - AQI: 43, Pollutant: OZONE
      Santa Clara Valley - AQI: 45, 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: Good, Pollutant: OZONE
      South and Central Bay - AQI: Good, Pollutant: OZONE
      Santa Clara Valley - AQI: Good, Pollutant: OZONE