Study says South Bronx pollution worsened after congestion tolls

Researchers at Columbia University say air sensors in the South Bronx detected a 2 percent increase in toxic particles after congestion tolls were introduced in New York City.

The finding was reported on 6 May and is based on sensor readings in the area, according to the supplied study summary.

The row does not give further detail on the time period measured or the specific pollutants involved.

M.T.A. officials disputed the report.

No additional official response or enforcement action was included in the supplied material.

The result matters because congestion pricing was intended in part to reduce traffic and improve air quality in and around the city.

A reported rise in pollution in the South Bronx would raise questions about whether benefits are being felt evenly across neighbourhoods.

The supplied row identifies Columbia University as the source of the research and the M.T.A. as the agency challenging it.

It also places the finding in the South Bronx, a part of New York City.

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