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It absolutely is, but truth is that today, most pollution isn't even from engine emissions but rather from the tires. EU countries is once again decades ahead here with practically all two or three axled trailers having rear wheel steering.

This reduces wear a lot when turning. Same thing with semi trucks and lorries, anything with two or three axles has rear steering and even hydraulic lift for the rear axles, meaning less wheels touch the road when driving unloaded.

Then there's the obvious one, if a single bus can replace 50 car trips, it doesn't really matter if the bus pollute 5-6 times more than one regular car, there's still a huge reduction in air pollution as well as improved traffic flow.

Things that breaks due to (((complexity))) is a huge source of pollution. And that goes beyond air pollution. Lot's of ground water pollution and other fuckery.