I can't really add anything to the answers - (good, succint link there, mibn2.)
But rachael88 - why say "this is going to sound a bit stupid" ? You saw that the moon had an orange tint and wondered why. There is nothing silly in that!
Science is all about observations and finding out answers and explanations!
Yours was an entirely sensible question based on what you saw, so please don't feel silly for asking!