Composition of the EarthÕs
Atmosphere
|
Gas |
Percent (By Volume Dry Air) |
|
Nitrogen (N) |
78.08 % |
|
Oxygen (O) |
20.95 % |
|
Argon (Ar) |
0.93 % |
|
Neon (Ne) |
0.0018 % |
|
Helium (He) |
0.0005 % |
|
Hydrogen (H2) |
0.00006 % |
|
Xenon (Xe) |
0.000009 % |
|
Other Particles |
|
|
Water Vapor (H2O) |
0-4 % |
|
Carbon Dioxide (CO2) |
0.036 % |
|
Methane (CH4) |
0.00017 % |
|
Nitrous Oxide (N2O) |
0.00003 % |
|
Ozone (O3) |
0.000004 % |
|
Particles (dust, soot, etc.) |
0.000001 % |
|
Chlorofluorocarbons (CFCs) |
0.00000002 % |