Stratosphere
Carbon dioxide
Troposphere
0,97%. It comes from the evaporation of oceans, lakes and rivers and also from plant transpiration.
Mesosphere
0,03%. It has no colour or smell, is also produced by plant and animal respiration. Essential for photosynthesis.
Argon
Oxygen
21%. Plants produce it. It is necessary for combustion and respiration.
Ozone
Water vapour
78%. It has no colour, no smell and no taste.
Nitrogen
Termosphere