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Composition of the Atmosphere
The Variable Gasses
| Gas | Symbol | % by vol | Importance |
| Water Vapor | H2O | 0-4 | |
| Carbon Dioxide - it's on the increase in atm. | CO2 | 0.038 | |
| Methane - it's also on the increase in atm. | CH4 | 0.00017 | |
| Nitrous Oxide | N2O | 0.00003 | |
| Ozone | O3 | 0.000004 | |
| Particles (dust, soot, etc) also called aerosols |
0.000001 |
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