In the first six months of congestion pricing, air pollution within Manhattan's toll zone dropped 25%.
Pollution fell across the five boroughs and in the suburbs, too. A clean air win all around.

Congestion pricing improved air quality in NYC and suburbs | Cornell Chronicle
Cornell researchers tallied the environmental benefits of New York City’s congestion pricing program and found air pollution dropped by 22% in Manhattan, with additional declines across the city’s fiv...