vegyület

képlet

koncentráció

nitrogen

N₂

78.08 pph

oxygen

O₂

20.95 pph

argon

Ar

0.93 pph

water

^H2^O

variable

carbon dioxide

CO₂

325 ppm

neon

Ne

18 ppm

helium

He

5 ppm

methane

CH₄

2 ppm

krypton

Kr

1 ppm

hydrogen

H₂

0.5 ppm

nitrous oxide

N₂O

0.3 ppm

carbon monoxide

CO

.05 - .2 ppm

ozone

O₃

.02 - 10 ppm

xenon

Xe

0.08 ppm

ammonia

NH₃

4 ppb

nitrogen dioxide

NO₂

1 ppb

sulfur dioxide

SO₂

1 ppb

hydrogen sulfide

H₂S

.05 ppb