Here are a couple of websites that provide air quality values. The one below showing an Ottawa 8am reading is from the World Air Quality Project at

Note that this site provides minimum and maximum values over the last 48 hours.

Here are screen captures from for Ottawa around 7:30-7:55 am June 7, 2023. When I looked at it again later the 471 value had disappeared and a slightly lower value was provided. This site provides an air quality forecast.

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