A Smog Advisory means that there is a strong likelihood that there may be poor air quality within the next 24 hours due to ground-level ozone and particulate matter.
A Smog Watch means that there is a 50 per cent chance that a smog day is coming within the next three days of being issued. This could result in higher levels of ground-level ozone and particulate matter.
Did you know that on many smog alert days, Ontario's coal plants are running full out, making our air quality even worse? By cutting peak electricity demand, which is often driven by air conditioning use on hot summer days, we can significantly reduce the need to use coal when air quality is at its worse. Visit www.PeakBusters.ca for more on what you can do.