Guide to Environment Canada’s Air Quality Health Index Forecasts

Air Quality elements and when they are included in the forecast

Maximum Air Quality Health Index (AQHI)
Included in the forecast for Day 1 and 2?
- Yes

Indicates the maximum AQHI numerical value and category

Day 1 and 2: The maximum AQHI value is the only element in the forecast and will represent the maximum AQHI value over each part period, today, tonight and Day 2.


  • 1-3: Low risk
  • 4-6: Moderate risk
  • 7-10: High risk
  • Above 10: Very high risk

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