New Yorkers in some parts of the city may be facing a higher risk of stroke because of air pollution.
According to the Daily News, new research by NYU Langone Medical Center shows air in the city contains pollutants that can constrict arteries to the brain.
Federal standards say humans can safely tolerate 12 micrograms of pollution per cubic meter of air.
But some neighborhoods are testing higher.
When broken down by borough, the dirtiest air can be found in Gramercy in Manhattan; Greenpoint, Brooklyn; Morrisania and High Bridge in the Bronx; Astoria, Queens; and Port Richmond on Staten Island.
Residents of the Rockaways in Queens breathe the cleanest air.
The study's author tells the News that people already at risk of stroke should try to stay indoors when smog or ozone levels are high.
Despite the pollution in New York's air, it's nowhere near as bad as places like Beijing.
A recent reading in the Chinese capital showed 568 micrograms of pollution per cubic meter of air.