How much do buses reduce carbon emissions?

The more passengers that are riding a bus or train, the lower the emissions per passenger mile. For in- stance, U.S. bus transit, which has about a quarter (28%) of its seats occupied on average, emits an es- timated 33% lower greenhouse gas emissions per passenger mile than the average U.S. single occu- pancy vehicle.



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Thomas Rubin, Marcy Lowe, Bengu Aytekin and Gary Gereffi Debate Public Transit Buses: A Green Choice Gets Greener. The American Public Transit Association claims that public transit saves an estimated 1.4 billion gallons of gas annually, which translates into about 14 million tons of CO2.

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Every vehicle on the road releases an average of one pound of CO2 per mile driven. Compared with driving alone, taking public transportation reduces CO2 emissions by 45%, decreasing pollutants in the atmosphere and improving air quality.

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Mathews points to research showing that trains emit the lowest of CO2 per passenger mile at 177 grams per passenger mile. Buses come in at 299 grams per mile, second-worst only to cars at 371 grams.

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Mathews points to research showing that trains emit the lowest of CO2 per passenger mile at 177 grams per passenger mile. Buses come in at 299 grams per mile, second-worst only to cars at 371 grams.

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Public transportation gets people where they're going while emitting far fewer climate-warming greenhouse gases than private cars. The reason is simple efficiency: while cars usually carry just one or two people at a time, a bus can carry 50 or more, and a train in a large city may carry thousands.

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For example, the latest 2022 Defra statistics show that an average petrol car emits 170g of carbon dioxide vs 96g for an average bus, and 35g for national rail per passenger km.

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“When you take into account the production of railroad equipment and tracks, all of that is very carbon intensive as well,” says Hamilton. “Take the entire picture and trains are actually more polluting than the road buses, even though buses all run with dirty diesel fuel.”

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A bus or train ride emits three to seven times less emissions than an airplane flight. Two people who take a bus instead of driving (even a hybrid!) will cut their CO2 emissions by half!

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On average, cars emit almost one pound of carbon dioxide per passenger mile. Buses, which generally run at about 25 percent capacity, emit 0.64 pound of CO2 per passenger mile, according to data from the Department of Defense.

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A single bus, if it is full (50 to 80 passengers), can carry as many people as 50 or 60 cars, which normally operate with fewer than 2 occupants. The bus requires less street space, equivalent to 2 or 3 automobiles, and, when it is full, it requires much less energy to move each person.

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Trains. Besides walking and biking, traveling by train remains one of the greenest and most environment-friendly options when getting around. Regardless if electric or diesel-powered, trains emit between 66 and 75 percent fewer carbon emissions when compared to cars and airplanes.

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