Toronto - Air Quality Health Index

Observed ConditionsFootnote †

  • Past 24 hr
  • AQHI by Station
    • Calculated at: 7:00 PM EDT Thursday 19 June 2025

    3Low Risk




    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    +

    Low Risk
    (1-3)

    Moderate Risk
    (4-6)

    High Risk
    (7-10)

    Very High Risk



    At-Risk Population:

    General Population:

    • Ideal air quality for outdoor activities.

    Forecast Maximums

  • Next 24 hr
  • Health Message
    • Issued at: 5:00 PM EDT Thursday 19 June 2025

    Thursday night

    2 - Low Risk

    Friday

    2 - Low Risk

    Friday night

    3 - Low Risk

    Saturday

    3 - Low Risk

    Who is at risk?

    People with heart and lung conditions are most affected by air pollution.

    To find out if you are at risk, consult the health guide, your physician, or your local health authority.

    Visit the national AQHI Web site to learn more about the AQHI.

    Did you know...?

    You should limit the use of toxic paints, paint removers, stains, varnishes, waxes, glues, adhesives and cleaners on days when the air quality is high risk.


    The AQHI is an initiative between Environment Canada, Health Canada and the Province of Ontario.