On July 16, smoke from Canadian wildfires created unhealthy to hazardous air quality across ten US states from Minnesota to Maryland and into Ontario, with Detroit recording the world's worst reading of 600 according to IQAir. The conditions affected cities including Minneapolis, Milwaukee, and Toronto, while New Jersey air quality was rated unhealthy for sensitive groups ahead of the July 19 FIFA World Cup final. Meteorologists forecast rain on Saturday and a cold front on Sunday to clear the smoke.