Sonar in the ocean is actually having a far more harmfull effect on dolphins, whales, and other marine life than just being annoying. It instead interfers with the creatures own way of navigating in the water, as well as a few issues on their ability to find food. I can;t really remember the exact details at the current moment, as this was from an article a little while back(say 2-3 months) but either way, "noise pollution" in an aquatic sense does have more effects than simple annoyance.
Nevertheless, it is still not
the same as the kind of pollution that leaves residue in the environment. I don't have to argue that it has no effect at all in order to show that its consequences are relatively insignificant compared to other forms of pollution (leaving aside radiofrequency "pollution", which is an even sillier inclusion since it is not even detectable without the right equipment).
While not nesasarily pollution, whats sad up in Canada is the cutting down of the Red Hill Creek forest simply to make an expressway so people can shave a bit of time off their rout to work.
Actually, speeding up highway travel is a very good thing for the environment, because it means less time spent idling your engine and pumping garbage into the air.