Hamilton Mountain - Air Quality Health Index

Observed ConditionsFootnote †

  • Past 24 hr
  • AQHI by Station
    • Calculated at: 9:00 AM EDT Sunday 6 July 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: 6:00 AM EDT Sunday 6 July 2025

    Sunday

    5 - Moderate Risk

    Sunday night

    4 - Moderate Risk

    Monday

    4 - Moderate Risk

    Monday night

    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, or your physician.

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

    Did you know...?

    After a labour dispute shut down an American steel mill, respiratory hospital admissions in children substantially decreased. They increased to pre-strike levels when it ended.


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