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 https://aqicn.org/map/ottawa/
Note that this site provides minimum and maximum values over the last 48 hours.
Here are screen captures from IQAir.com 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.
