why is air never pure?

Answer 1

Air is not a pure substance. It is a combination of different gases: 78% Nitrogen, 21% Oxigen, 1% other.

Answer 2

Air is a mixture of gasses, mainly Nitrogen (N2) and Oxygen (O2), in highly populated areas with many vehicles or factories, a larger percentage of Carbon Dioxide and Carbon Monoxide (CO2, CO) would be expected than say on a remote island.
Most chemical industries and large academic institutions have access to pure Nitrogen or Oxygen gas, even pressurised ‘air’ I believe that is the closest to pure air you would be able to find.

Answer 3

when you say pure, how do you define it? Pure as in only one matter is there? Because air is really never pure since it is composed of different elements which are mainly oxygen, nitrogen and other gases plus all the pollutants nowadays.

Answer 4

"Pure" is a term used only for elements or compounds. Air, however, is a mixture -- lots of nitrogen gas, quite a bit of oxygen, a little CO2, trace amounts of argon and other noble gases, etc. So, even if a sample of air isn't dirty (like with smoke), it still can't be accurately described as "pure."

Answer 5

Air is "fresh" in some areas like mountain peaceful places. Air here in California is dirty because people are always driving on the freeways or busy roads. It always busy in the morning & afternoon drive time & theres nothing we can do about it unless there are more public transportation trains, people start buying hybrids, etc.

Answer 6

When Earth formed, there were lots of chemicals present. Chemical reactiosn make new ones all the time.

It is not "pure" as different chemicals are rpesent in it. They cehmicals always mix as it creates a higher entropy (ie it is less organise-d all chemicals want to do that).

Answer 7

pure air is pure.

Answer 8

no it's a mixture of gases not one pure element

Answer 9

because if it was we would be dead