“People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease,” the agency said.
A toll-free air quality hotline has been opened so New Yorkers can get an update on air quality in their area. The number is 1-800-535-1345.
The alert pertains to New York, the Bronx, Kings, Queens, Richmond, Nassau, Suffolk, Westchester, and Rockland, and will be in effect until midnight ET on Thursday night.

“The cause of the fire was determined to be incendiary by an improperly extinguished bonfire,” the statement read.
Kling has been taken into custody.
The fire spread fast, setting the Pine Barrens ablaze at lightning speed. Thousands of people have been evacuated from their homes.
No injuries have been reported from the wildfire.
The Fire Service reported on Thursday that multiple outbuildings and vehicles have been destroyed, along with at least one commercial building, while 8 more structures remained threatened.
A complete damage assessment is being prepared, the service said.
“During a wildfire, our aircraft fly low to the ground, often at the same altitude that a drone would fly,” the service said in the announcement. “If a drone is detected flying over or near a wildfire, all Forest Fire Service air support will be grounded—hampering suppression and observation efforts.”