At highway speeds aerodynamic drag creates more noise than the motor itself (externally). So an electric car makes little difference there. Reducing speed reduces noise non-linearly. Therefore electric cars make a big difference for noise pollution in slower city streets. Inter-city travel just needs to be reduced, slowed down, and moved to well built electric rail.

It's cars, yes, and it's also other forms of transportation including railroads and airplanes, it's street cleaning vehicles, leaf blowers, lawn work, garbage collection, inconsiderate people, construction work, etc etc. Not all of these are going to avoidable, but at the moment it's a free externality, there is essentially zero incentive to cut it down and it shows.

Not motorcycles? With their ridiculous exhaust? Esp. Harleys at 3am.