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Air Air means Earth's atmosphere. It is the clear gas we live in and breathe in. It has no color or smell. But it has weight. Air creates atmosphere pressure. There are no air in the vacuum and cosmos. Air is a mixture of 78.03% Nitrogen, 20.99% Oxygen, 0.94% Argon, 0.03% Carbon Dioxide, 0.01% Hydrogen, 0.00123% Neon, 0.0004% Helium, 0.00005% Krypton, 0.000006% Xenon. We need the oxygen in the air to live. In our bodies, the lungs give oxygen to the blood, and give back carbon dioxide to the air. The wind is moving air. Air can be polluted from gas, smoke, and ash. This pollution may be one of the causes of global warming. Plants and animals also need air to live. Eco Forum UNEP Kyoto protocol Climate change Air Pollution Air Pollution Prevention |
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