I visited Boston from the UK last year and was struck by the lower level of traffic noise. I attributed it to there being far fewer diesel cars and more EVs & h

I visited Boston from the UK last year and was struck by the lower level of traffic noise. I attributed it to there being far fewer diesel cars and more EVs & hybrids. In the UK we have diesel powered buses and taxis everywhere as well as lots of personal cars, and the engines all have a much deeper and louder rumble than petrol engines.