Good Morning Army. I disagree that the air today smells worse. Imagine Times Square with dirt roads. Now imagine everyone in NYC riding horses. One might want to be careful crossing the street to avoid the proverbial "Stepping in it"

. A nice spring rain would only make it "smell fresh outside" if you enjoyed the odor of horse manure.
And in the country ? Does the word "outhouse" conjure an image in your mind ? Trust me, modern septic systems are far superior to "back when".
Only in a large forest or near an ocean will you find fresh air, and even then there are bacteria and particles in the air we breathe. Although it was a lousy movie, 'War of the Worlds' with Tom Cruise had an interesting ending. For all our technology, we were powerless over the invading force. But the invaders died from sickness breathing the air that contained bacteria that we as humans were accustomed to.
And, if I am going to be up this early, I need coffee...