MLHU - Health Status Resource

Air Quality Index (AQI)

Since 2015, the Air Quality Health Index (AQHI) has been used in Ontario to assess the quality of outdoor air and potential impacts on human health. This index is calculated based on three air pollutants: fine particulate matter, nitrogen dioxide, and ground-level ozone. The AQHI scale is from one to 10; the higher the AQHI rating, greater is the likelihood of health impacts.