As Canada enters the wildfire season, forest wildfires that have swept through the country's northwestern Ontario over the past few days have caused air quality to deteriorate dramatically in many places. Canada's smog also “crosses borders” and affects air quality in many US cities, including New York, triggering health warnings. On the 18th, Canada's Governor of Ontario Doug Ford responded to US President Trump's accusation that Canadian wildfire smoke affected the US, criticizing that the US side should not blame Canada for the wildfires and haze problems.

As Canada enters the wildfire season, forest wildfires that have swept through the country's northwestern Ontario over the past few days have caused air quality to deteriorate dramatically in many places. Canada's smog also “crosses borders” and affects air quality in many US cities, including New York, triggering health warnings. On the 18th, Canada's Governor of Ontario Doug Ford responded to US President Trump's accusation that Canadian wildfire smoke affected the US, criticizing that the US side should not blame Canada for the wildfires and haze problems.