Canada issued air quality warnings as wildfire smoke from Canada’s fires spread into the United States, worsening conditions in several cities and regions. Officials warned residents to limit outdoor activity and monitor local air quality as smoky haze persisted. The advisories followed heightened political tensions after U.S. President Donald Trump threatened new tariffs on Canada, blaming Ottawa for unhealthy cross-border air. Ontario Premier Doug Ford dismissed the criticism, urging cooperation and firefighting support rather than blame, as emergency responses continued amid ongoing blazes.