Air Quality Health Index (AQHI) (Canada)

This webpage explains the Air Quality Health Index (AQHI), a 1–10+ scale used to communicate the health risks associated with local air pollution in Canada. It describes the four risk categories and corresponding health recommendations, including guidance for people more vulnerable to poor air quality, and explains that the AQHI is calculated using ground-level ozone, particulate matter and nitrogen dioxide. The page also details how the index is adjusted during wildfire smoke events, how community readings and forecasts are produced, and how air quality alerts are issued. It provides information on accessing local AQHI forecasts and monitoring stations, forecast schedules, and the network of provincial, territorial, municipal, health and environmental organizations involved in delivering the AQHI across Canada.