Northeast flights delayed as Canada wildfire smoke cuts visibility

Smoke from wildfires in Canada delayed flights at New York-area airports and in Philadelphia on Wednesday as haze blanketed the region and cut visibility.

“The FAA is now slowing traffic from the East Coast and Midwest bound for Philadelphia International Airport due to reduced visibility from wildfire smoke,” the agency said in a statement.

The FAA earlier briefly halted flights bound for New York’s LaGuardia Airport.

“The agency will adjust the volume of traffic to account for the rapidly changing conditions,” the FAA said.

Smoke drifting south from wildfires in Canada covered the New York City area on Tuesday into Wednesday, tainting air quality and sending residents indoors. As of noon Wednesday, the city ranked fourth in the world for worst air quality, with an IQAir World Air Quality Index of 158, a level considered unhealthy for all residents.

As of about 3:00 p.m. ET, more than 2,000 U.S. flights were delayed, according to flight-tracking site FlightAware. As of mid-afternoon, 115 flights scheduled to fly to Newark, or around 18% of the day’s total, were delayed, according to FlightAware. More than 180 flights to LaGuardia, around a third of that schedule, were also late.

Flights to LaGuardia were delayed an average of about 120 minutes, and flights to Newark were delayed an average of 82 minutes, according to the FAA.

The agency did not report delays at New York’s John F. Kennedy International Airport.

United Airlines said in a statement it was “monitoring the situation closely and looking out for the safety of our employees who work outside, and adjusting our schedule where needed.”

A spokesman for Delta Air Lines told CNBC that the carrier has protective equipment for staff.

“And for those who work on the tarmac, we’re having them come inside to where breakrooms are in between aircraft turns,” the spokesman said. “We are also watching the forecasts which call for rain in NYC in the days ahead which should improve the air quality.”

— CNBC’s Emma Newburger contributed to this report.