Ottawa Public Health: Outdoor air quality

Air quality warnings are issued jointly by ECCC and the Ontario Ministry of Environment, Conservation and Parks (MECP) when the air quality health index (AQHI)↗ reaches a high-risk range (AQHI 7-10) or the very high risk range (10+). These warnings can range from a few hours to a few days and include when wildfire smoke is expected to cause deteriorating air quality.

Outdoor air pollution can be harmful, especially over a long period of time. Those most at risk include people with pre-existing cardiovascular or respiratory conditions, children, and older adults (65+). When extreme heat and poor outdoor air quality occur at the same time, prioritize cooling down.

Visit the OPH Outdoor Air Pollution↗ webpage for information on how residents can protect themselves from outdoor air pollution, including wildfire smoke, and suggestions on how to reduce exposure. Air Quality Ontario↗ (a website of MECP) has additional health messaging.