Well, Air Fresheners let off CFC's(Chloroflurocarbons) which once are released into the atmosphere are very hard to break down. CFC's deteriorate the Ozone layer, which is our protection from the...
"Air pressure can change from day to day. A denser substance has more mass per unit volume than a less dense one. So denser air exerts more pressure than less dense air." -Focus on: California Earth...