The NYPD will study how chemical gases might dissipate in city subways underground in a possible terror attack.

The test, conducted with the U.S. Department of Energy’s Brookhaven National Laboratory, will be the largest-ever study of the risks of airborne contaminants.

During three separate days in July, researchers will disperse harmless gases in 21 subway lines and at street level, tracking how they disperse.

Researchers said they will release the gases in the Bronx, Brooklyn, Queens, Staten Island and Manhattan from 59th Street to the Battery.

The gases will be perfluorocarbons, which pose no health or environmental threat, according to the NYPD.

Ultimately, the NYPD will use the data to decide how to best respond in such an emergency.

“The NYPD works for the best but plans for the worst when it comes to potentially catastrophic attacks such as ones employing radiological contaminants or weaponized anthrax,” Kelly said.

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Another MTA fare hike is in store for New Yorkers beginning this weekend. Prices are going up for all New York City subways and buses, as well as tolls for bridges and tunnels and fares for the Long Island Railroad and Metro-North.

Beginning 12 a.m. on Sunday, the price of a single subway or bus ride will go up from $2.25 to $2.50. A monthly MetroCard will go up from $104 to $112. A 7-day unlimited MetroCard will cost $30, up from $29. The pay-per-ride bonus discount is also being reduced, from 7 percent to 5 percent.

For express buses, the cost of one ride goes up from $5.50 to $6.00. The 7-day express bus plus MetroCard will cost $55, up from $50.

Higher tolls also go into effect on Sunday, with tolls at most bridges and tunnels going up from $4.80 to $5.33 for E-ZPass customers, and from $6.50 to $7.50 for those paying cash.

Long Island Railroad and Metro-North customers will have to shell out more money beginning Friday, with fares increasing by between 8.2 percent and 9.3 percent.

The MTA announced the fare hike proposals in October, citing need for additional revenue to fill its budget deficit.

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