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This question is about air pollutants. Look at the graph. It shows how the levels of some pollutants found in UK cities have changed from 1990 to 2008. carbon monoxide

oxides of nitrogen

sulfur dioxide

0 –10 –20 –30 percentage –40 change in –50 emission –60 –70 –80 –90 –100 The levels of these pollutants have decreased. Explain, using a chemical equation, possible reasons for these changes. Explain why it is important that air pollution is controlled. The quality of written communication will be assessed in your answer to this question. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... ..................................................................................................................................................... [6] [Total: 6]

© OCR 2012

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