NYC Air Quality Drops as Canada Fire Smoke Swirls South

New York City air quality is dropping as Canadian forest-fire smoke swirls down the Hudson River, shrouding much of the eastern half of the continent in a haze.

Air-quality alerts have been posted in New York City, with 740 fires raging across Canada from the Arctic Circle to southern Ontario. In the US, the warnings reach from Minnesota to Maine, while in Canada bulletins have been posted from the Northwest Territories to Quebec.