Science air pollution help? percentage of chemicals in air?

Question

how much Nitrogen oxides, Hydrogen, Carbon Dioxide, Oxygen., carbon monoxide, and ground-level ozone is there in the air in NYC, Boston, Denver, Chicago, and Los Angeles in 1900 , 1930 , 1960 , 1990 and 2008

Need mayjor help please please please

i need like percents or sumtin

Answer 1

This is waaaay too hard of a question to answer without doing a LOT of reading and research. That's why nobody answered it. (Except for me) Here are two good links for you to go to to read and search for the specific things you are looking for. The first has a LOT of good info and maps of this, and the 2nd is the EPA itself.

http://en.wikipedia.org/wiki/Air_Polluti...

http://www.epa.gov/