TIL that in Ontario I shouldn't trust the Environment Canada Air Quality Health Index (AQHI) about fire smoke because it's not focused enough on that. And also about useful resources for tracking this:
https://firesmoke.ca/forecasts/current/
http://www.airqualityontario.com/history/pollutant.php?stationid=51001&pol_code=124
https://map.purpleair.com/1/m/i/mPM25/a10/p604800/cC0#11.47/43.6705/-79.4413
All from this thread. which has more: https://mstdn.science/@jeffgilchrist/110641838755993297