Only if the bus uses fossil fuels. Many buses have now become equipped with natural gas powered engines, or electricity (such as the case with many buses in san fransisco).
Buses generally use diesel, which burns cleaner than regualr gasoline that we use in our cars. In Westchester county, NY (my home country) new Bee Line busses are being equipt with hybrid battery packs ontop so they can run off both diesel and electricity.
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