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Air Quality Health Index (AQHI)

Invest in Halton Air Quality Health Index (AQHI)

Know the colour! Protect your health!

The Air Quality Health Index (AQHI) is a scale designed to help you understand what the quality of the air around you means to your health. It is a tool developed by health and environmental professionals to communicate the health risk posed by air pollution; the higher the number, the greater the health risk and our need to take precautions. You can refer to Today’s Air Quality to check the quality of outdoor air in Halton before heading off to work or play. And you can use the forecasts to plan your activities, whether over the next hour or the next day.

For more information, download the AQHI postcard

Blue air day (1-3)

On a blue air day (1-3), air quality is ideal for enjoying outdoor activities.

Orange air day (4-6)

On an orange air day (4-6), people with heart or breathing issues may want to consider reducing or rescheduling strenuous activities outdoors. Otherwise, enjoy being physically active outdoors.

Red air day (7-10)

On a red air day (7-10), people with heart or breathing issues, as well as children and older adults, should reduce or reschedule outdoor activities. Otherwise, consider reducing or rescheduling strenuous outdoor activities, if you experience symptoms such as coughing or throat irritation.

Maroon air day (+10)

Occasionally, when the amount of air pollution is extremely high, such as during large, prolonged fires, the AQHI may exceed 10 and become a maroon air day.