Air Quality Informaton


  • Spare the Air Status for Thursday, March 28, 2024

    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


    Current Air Quality Index Map


    0-50 Good
    51-100 Moderate
    101-150 Unhealthy for Sensitive Groups
    151-200 Unhealthy
    201-300 Very Unhealthy
    301-500 Hazardous
    AQI Maps courtesy of AIRNow.gov


    • AQI and Pollutant Forecast for Wednesday by district.
      North Counties - AQI: 32, Pollutant: OZONE.
      Coast and Central Bay - AQI: 46, Pollutant: PM2.5.
      Eastern District - AQI: 34, Pollutant: OZONE
      South and Central Bay - AQI: 31, Pollutant: OZONE
      Santa Clara Valley - AQI: 33, Pollutant: OZONE
    • AQI and Pollutant Forecast for Thursday by district.
      North Counties - AQI: 35, Pollutant: OZONE.
      Coast and Central Bay - AQI: 42, Pollutant: PM2.5.
      Eastern District - AQI: 37, Pollutant: OZONE
      South and Central Bay - AQI: 34, Pollutant: OZONE
      Santa Clara Valley - AQI: 36, Pollutant: OZONE
    • AQI and Pollutant Forecast for Friday 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
    • AQI and Pollutant Forecast for Saturday 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
    • AQI and Pollutant Forecast for Sunday 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