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Primary and Secondary Pollutants:When fuels are burnt in both car exhausts and power stations primary pollutants are released into the atmosphere.
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Primary and Secondary Pollutants: When fuels are burnt in both car exhausts and power stations primary pollutants are released into the atmosphere. Secondary pollutants are formed when primary pollutants undergo further reactions. For example Ozone is a secondary pollutant formed when sunlight shines on nitrogen oxides and hydrocarbons. Ozone is a major component of photochemical smog. Primary Pollutants Secondary Pollutants Nitrogen oxides (NOx) Carbon Monoxide (CO) Hydrocarbons (CxHy) Ozone (O3) Peroxyacetyl nitrate (PAN) HNO3 NO2 H2O2 There are 2 main types of primary pollutants responsible for photochemical smog. 1. Oxides of nitrogen formed when nitrogen in the air reacts with oxygen, under high temperatures and pressure. 2. Hydrocarbons emitted from car exhausts as unburnt fuel. Photochemical smog is formed by the action of the suns rays on these primary pollutants. How are Primary Pollutants formed ? Primary pollutants are formed during the combustion of fuel in coal fired power stations. Carbon dioxide, sulphur oxides and nitrogen oxides are all primary pollutants produced when coal...
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