What are the emissions of a diesel bus?

Particulate matter from traditional transit buses contains numerous harmful gases and upwards of 40 cancer-causing substances. A typical diesel bus emits 229,167 lbs. of greenhouse gases annually, while a CNG bus emits 219,083 lbs./year and a diesel hybrid emits 163,286 lbs./year.



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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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Environmental Impact of School Buses That's the equivalent of 3.75 pounds of carbon dioxide for every mile driven. Electrifying the entire fleet of U.S. school buses would reduce greenhouse gas emissions by approximately 8 megatons per year and reduce emissions from all U.S. buses by 35%.

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Avoid Short Flights For example, while a flight would emit around 109 pounds of CO2 per passenger on a 200-mile trip, that trip on a train or charter bus would emit just 26 and 19 pounds of CO2 per passenger, respectively.

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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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Most buses today are diesel-powered, with a slow introduction of hybrid and electric-powered buses. For the most part, though, buses are powered by fossil fuels and still emit carbon dioxide emissions at a higher rate than vehicles do.

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“From the point of view of both congestion and pollution, intercity buses are the least polluting form of transportation out there,” said Hamilton, vice president of the ATU and former head of the Greyhound local. “The only thing that has less carbon footprint is walking and bicycling.

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