What are the gases in Earth's atmosphere in order of most abundant to least?

1 Answer
Feb 27, 2017

The list below is as close as I could get it.


The following are in constant proportion, not varying from one location to another:

Nitrogen 78.08%
Oxygen 20.95%
Argon 0.93%
Trace elements include Ne, He and Kr at about 0.0001% each

Variable proportion:

Carbon dioxide 0.037%
Water vapour 0 to 4%, depending on location and season.
Sulfur dioxide
Nitrogen oxides

(The final four in "trace amounts" only.)