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the water? (clean/polluted) What cause(s) the pollution? (litter, chemicals from factories, etc.) What are the effects of the pollution? (dead fish, can’t swim, etc.) Air pollution Is the air clean or dirty where you live? Can you smell nasty gases from cars? Is there a building site, factory or power station nearby? What problems does air pollution cause? (unpleasant smells, kill trees, etc.) Choose three of these problems. Plan a letter to the Bureau describing them and asking for their help in solving them. You can use the notes below to help you. A2 Work alone.