Smoke from more than 800 Canadian wildfires reached multiple U.S. cities on Friday, producing hazardous air quality readings in Detroit and Chicago and unhealthy conditions for sensitive groups in the New York metro area. The National Weather Service warned of possible worsening overnight, while U.S. agencies reported 68 large domestic fires burning nearly 3.72 million acres this year. Ohio Senator Bernie Moreno introduced legislation to sanction Canada over the smoke.