Not sure about fires in US and Canada, but Mexico is covered in fires every June, at the end of the dry season. Farmers and ranchers burn off their brush and when the rainy season starts in late June-early July, the new growth comes back with a vengeance. Happens every year.
Zoom in on the map, sampling Ohio for example, fires include road/highway segments, or forested areas. I’ve seen other years, this is very abnormal.