When it comes to the quality of air in cities, how good is good enough? Air seem!
Question:
When it comes to the quality of air in cities, how good is good enough? Air seems important to me.?
http://money.cnn.com/magazines/moneymag/... has a list of clean air cities.
Answers:
Air is an illusion meant to give your life the appearence of atmosphere. Oxygen itself is a secret military death vapor.