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:

firesmoke.ca/forecasts/current/
airqualityontario.com/history/
map.purpleair.com/1/m/i/mPM25/

All from this thread. which has more: mstdn.science/@jeffgilchrist/1

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