Wildfires are burning across the western U.S. and Canada, leaving some residents keeping a wary eye out for possible evacuation orders.
The Air Quality Index was projected to climb as high as 200 later in the day. An AQI level above 160 falls within the "unhealthy" category.
New York City and surrounding areas are under an Air Quality Advisory due to the wildfires burning in Canada.
Heavy smoke from several large wildfires blazing in Canada and Minnesota is expected to engulf large swaths of the Midwest and Northeast U.S. this week, exposing millions of people to dangerous air pollution.
Three firefighters killed over the weekend in a wildfire along the Colorado-Utah border were trying to shield themselves from flames by deploying tent-like shelters when they were overcome, authorities said.
Three firefighters were killed on Saturday while responding to the Snyder Fire, a wildfire burning along the Utah-Colorado border, the U.S. Wildland Fire Service announced overnight.