Air Quality Index AQI Readings:

Ontario's Air Quality Index

Air Quality Index AQI Readings for Wednesday, May 16, 2012, 10:00 pm

The AQI is used as an indicator of ambient air quality based on the following pollutants in our air: Ozone (O3), Fine Particulate Matter (PM2.5), Nitrogen Dioxide (NO2), Carbon Monoxide (CO), Sulphur Dioxide (SO2), and Total Reduced Sulphur (TRS) Compounds.

Summary: List of Air Quality Readings

Note: The Air Quality data on this web page are based on automatically polled data and have not undergone final verification.

Note: N/A (Not Available) denotes invalid or missing data.

Air Quality Index (AQI) Categories

AQI Colour
0-15 Very Good Very Good
16-31 Good Good
32-49 Moderate Moderate
50-99 Poor Poor
100+ Very Poor Very Poor