Canadian wildfire smoke has plunged New York's air quality to hazardous levels, surpassing pollution in New Delhi and prompting widespread health warnings and emergency measures.

The smoke from the Canadian wildfires is causing air quality issues in the U.S. See where.

Warnings about dangerous, unhealthy air extended Wednesday from Minnesota through Toronto and into New York.

TORONTO/NEW YORK: Toronto’s air quality ranked the worst among major cities globally on Wednesday as wildfire smoke from northwestern Ontario blackened skies and spread into the…

A thick orange haze hung over Toronto on Wednesday 15 July as smoke from wildfires in northwestern Ontario engulfed Canada's largest city, giving it the worst air quality of any…

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Monitor ranks Toronto as having the worst air quality on earth, surpassing Kinshasa, DR Congo, and New Delhi, India.

Toronto recorded among the worst air quality of all major cities worldwide on Wednesday as thick smoke from wildfires in Ontario blanketed its skyline and drifted into the US,…

Detroit and Minneapolis rank among the top major cities for poor air quality.

Wildfire smoke from Ontario has severely degraded air quality across the northeastern United States. Chicago recorded "Very Unhealthy" levels of fine particulate pollution on…

Wondering why it smells like smoke outside? Canadian wildfires are impacting millions in Ontario, Minnesota, Toronto, New York, Michigan, Wisconsin and Boston.

Millions of Americans face air quality alerts from Minnesota to New York as authorities urge people to stay indoors

Large swaths of the US remain under air quality warnings

The EPA's Air Quality Index (AQI) measures how safe, unhealthy, or hazardous the air outside is. Here's a guide on how to read the AQI.

NEW YORK (AP) — Heavy, pungent smoke from Canadian wildfires darkened skies in the U.S. on Thursday, from the Great Lakes to parts of the East Coast, reducing visibility for

Las autoridades recomendaron reducir la exposición al aire libre, utilizar mascarillas cuando sea necesario salir y seguir el índice AQI para conocer la evolución de la situación

Air quality levels in Chicago, Detroitt and New York reached dangerously high levels on Tuesday as the US cities were shrouded in smoke produced by wildfires raging through…

The Manhattan skyline was obscured by thick haze and Chicago closed its beaches Thursday as out-of-control Canadian wildfires raged, sending smoke spewing into the United States…

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Canadian wildfires in Ontario have triggered mass evacuations and sent hazardous smoke across parts of the US and Canada, causing unhealthy air quality, health warnings, and…

A wave of toxic air flowing in from Canada to the US has transformed three major cities into the most unbreathable places on Earth.