The Western US has the worst air quality in the world, group says

Three major US cities being wreathed in smoke from massive wildfires now have the worst air quality of any big cities in the world, according to a monitoring group.

The Western US has the worst air quality in the world, group says
Three major US cities being wreathed in smoke from massive wildfires now have the worst air quality of any big cities in the world, according to a monitoring group.