Don’t believe the official narrative. Within 3 hours of the smoke appearing every news outlet from every city and town, big and small, had an article blaming Canadian wild fires and climate change.
But if you look at the AQI map you’ll see Canada’s air is cleaner than ours. The smoke is coming from four US cities: Detroit, Chicago, Indianapolis, and New Castle
The rain clouds hide the real source of the smoke, which is as mentioned above.
click any image to enlarge for detail. HiRes.