Sycamore sends this along, which shows exactly how much gunk and smoke was shipped, free of tariffs, down from the Quebecois fires. (See the yellow bits?)
This drastic form of air pollution included a ton of particulate, way more than is permitted by the EPA, and damn if it didn't make life miserable for a lot of people:
In response, we in the NE USA are planning to fire up more coal-fired power plants along the border. We'll just create more acid rain for those Quebecois. Even if they manage to break off politically from the rest of the country, they'll still get its air!