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What is a Smog Alert?

A Smog Alert is issued when air quality is expected to be poor over a period of time.

The Ministry of the Environment may issue two types of Smog Alerts:

  • A smog watch is issued when there is a 50 per cent probability that elevated smog levels will occur within the next three days

  • A smog advisory is issued when there is a strong likelihood of elevated smog levels occurring within the next 24 hours or if smog conditions happened without warning.

A Smog Advisory Termination Notice is issued by the Ministry of the Environment after the weather changes, the air clears and a Smog Advisory is no longer required.

For more information about smog alerts or to subscribe to the Smog Alert Network, visit the Ministry of the Environment's website.