(Bloomberg) -- U.S. drivers may soon see a new expense at some gas pumps: the cost of taking the global-warming fight on the road.

New York and four other states are exploring ways to put a price on the air pollution spewing from cars, trucks, trains and other vehicles — the source of more than a third of greenhouse-gas emissions in the northeastern U.S.

The result may eventually be new taxes, tolls or a pollution-trading system that could raise $3 billion a year or more for mass transit, electric-vehicle rebates and other projects, supporters say. With the Paris climate deal in the rear-view mirror and governments moving to put a price on industrial emissions, especially from power plants, regulators see tailpipe pollution as the next logical step.

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