(Bloomberg) — The hazy air hovering over US metropolises, including Chicago and New York, this summer is reminding Americans of just how connected they are with their northern neighbour, regardless of how much relations have deteriorated under President Donald Trump.

Canadian provinces have evacuated towns and struggled to contain the second-worst wildfire season in 30 years, while residents of some US cities have endured unhealthy air as smoke from the blazes wafts across the border.

The scenes of smoke-choked cities are reminiscent of 2023, when skies turned orange over New York City amid what was Canada’s worst wildfire season on record. They also come as the US West’s wildfire season worsens, with blazes burning in California, Arizona and Nevada, and France deals with the fallout fro

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