Amy's cleaning day?

Walking to school this morning, making encouraging small-talk (it's already getting hot by 9.00 and the walk is mostly uphill) I observed to Amy that the sky was very hazy over the mountains this morning ... the mountains "don't look as bright and clear as usual" was my way of explaining the word hazy. Amy, plodding on a few more steps and obviously checking said mountains and thinking this over, then replied "perhaps we'd better dust the mountains today then, Mummy." I'm afraid I didn't have time, but they cleared up by themselves, before too long.