Unfortunately ANC only works on some sounds. In the suburbs you have leafblowers and cars driving past you on the sidewalk, and ANC removes everything /else/ which makes them stand out even more.
I can tell you haven't heard a leaf blower in a while, if ever. The revving the operators inevitably do causes it to bounce up and down over the spectrum at completely random-seeming intervals. Punches right through ANC, windows, doors, walls.
As if that's not bad enough they pollute more than a gigantic SUV because of how much oil they burn being a two-stroke.