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There’s a new way to track the slow but critical progress toward slashing greenhouse gas emissions on Massachusetts roadways.

The state Department of Transportation launched an interactive online dashboard compiling data about passenger vehicles registered in Massachusetts, including whether they run on fossil fuels, electricity or a hybrid power source.

Data also include estimates of vehicle miles traveled and average mileage, all broken down by individual municipalities, providing insight into geographic trends as officials push to green the transportation system.

No city or town has a higher share of clean vehicles within its borders than Lexington, where 14.2% of registered vehicles are zero-emission or hybrid models, the dashboard shows. On Cape Cod, the Outer Cape towns of Wellfleet, Truro and Provincetown have the highest percentage of electric or hybrid vehicles ranging from 5.6 to 6.7%. In Falmouth, 5.1% of vehicles fall into the electric or hybrid category.

On the Islands, Chilmark has the highest percentage of clean vehicles at 8.3%, according to the dashboard.

Altogether, Massachusetts had nearly 69,000 zero-emission passenger vehicles and 153,000 hybrid passenger vehicles registered as of Jan. 1, compared to 4.6 million passenger fossil fuel vehicles. On the commercial side, MassDOT counted nearly 330,000 fossil fuel vehicles, 3,000 hybrid vehicles and 357 zero-emission vehicles at the start of the year.

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