How much pollution does a bus produce?

Answer 1

The amount of carbon footprint that a bus produces depends on the distance the bus travels. A bus that travels 100 miles will only produce a carbon footprint of 0.02 metric tons. A taxi that travels the same distance will produce a carbon footprint of 0.03 metric tons.

Answer 2

There isn't really one definitive answer to this question. For one, you didn't really specify a type of bus... charter buses aren't continuously running, there are coach buses, there are school buses, city buses, etc. School and city buses typically have lower displacement engines, but also have a lot more idle time, as they make multiple stops on their route. There are also several different way buses are powered. Internal combustion engines, for example. Current production diesels use an aftertreatment system which breaks down the exhaust into harmless elements, some cities have electrified their buses, some run on a hybrid or LPG drive system, and some of the diesels for local/short runs have taken to running straight biodiesel, as the nature of their route makes it so that the 12 - 16% power loss from running straight biodiesel vs. diesel fuel isn't a big deal.