Interesting term "light pollution"
.....don't like it one bit
A general definition of "pollution" could be stated thusly:
Presence of matter (gas, liquid, solid) or energy (heat, noise, radiation) whose nature, location, or quantity directly or indirectly alters characteristics or processes of any part of the environment, and causes (or has the potential to cause) damage to the condition, health, safety, or welfare of animals, humans, plants, or property.
....or astrophotography equipment?