Air Quality Forecast for Ontario
Local Hourly Air Quality Report

The Air Quality Index (AQI) is an indicator of air quality, based on hourly pollutant measurements of some or all of the six most common air pollutants: sulphur dioxide, ozone, nitrogen dioxide, total reduced sulphur compounds, carbon monoxide and fine particulate matter.

Here’s what the readings mean:
If the air quality value is below 32, the air quality is considered relatively good.
If the AQI value is in the range of 32 to 49 (moderate category), there may be some adverse effects on very sensitive people.

An index value in the 50 to 99 range (poor category), may have some short-term adverse effects on the human or animal populations, or may cause significant damage to vegetation and property.
An AQI value of 100 or more (very poor category) may cause adverse effects on a large proportion of those exposed.

Your Local Air Quality Health Index Conditions

The Air Quality Health Index (AQHI) is a Public Information tool that helps Canadians Protect their Health on a Daily basis from the Negative Effects of Air Pollution. This tool has been Developed by Health Canada and Environment Canada, in collaboration with the Provinces and key Health and Environment Stakeholders.

Choose from the Links below to learn more about the AQHI , or to find out if you are “at risk” from Air Pollution.
How is the AQHI calculated?

The AQHI is calculated based on the Relative Risks of a Combination of common Air Pollutants that is known to harm Human Health.

These Pollutants Include:

Ozone (O3) at ground level

Particulate Matter (PM2.5/PM10)

Nitrogen Dioxide (NO2)