Probably most of us have heard the pitch of an ambulance change as it’s passed us, but that’s from a nearby sound source. If a sound source is far away, does the Doppler shift change? I find it hard to believe that the sound wave compression would be the same over a mile as it is over a couple of feet. At the same time, astronomy uses Doppler shift over distances of many light years, but that’s also through space, where we don’t have air molecules bumping into each other and losing energy.
(I heard a Doppler shift from an ambulance that passed me while I was driving yesterday. When I heard another ambulance late at night that I suspect was about a mile away, I started wondering if the pitch shift would be the same.)