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Air Pollution: what can we do to prevent it? Air is one of the biggest matters on earth. We are polluting it with chemicals. What should we do to prevent it? Air is one of the biggest matters in the earth, apart from the core and the crust. But some of this air is polluted. Plants are recycling some of it, some of it is being wasted and some of it is being put to good use. In the Biosphere, we mustn’t mal use air. We have to use it wisely. But what happens if some of this air is polluted in the biosphere? What happens if we can’t purify the air? What would we do? Well we already have the technology to purify air and all we need to do is to install it. But how do they work? What are the properties of air? Composition of "normal" air Air is a mixture of gasses. Atmosphere gases of relatively constant concentration (in percent by volume) are as follows: Nitrogen (N2) 78.084 % Oxygen (O2) 20.946 % Argon (Ar) 0.934 % Neon (Ne) 0.0018 % Helium (He) 0.000524 % Methane (CH4) 0.0002 % Krypton (Kr) 0.000114 % ...Superman doesn't like this one! Hydrogen (H2) 0.00005 % Nitrous Oxide (N2O) 0.00005 % ...Laughing Gas! ha ha ha ha Xenon (Xe) 0.0000087 % The principal gases in air are water vapour, ozone, carbon diox