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Acid rain

Burning fossil fuels such as coal, oil, and gas causes acid rain. Normal rain is slightly
acidic (pH5) because carbon dioxide is soluble and dissolves in rain to give a weak
carbonic acid. Acid rain is more acidic (pH4 to pH2 – similar to lemon juice) because
the sulphur dioxide given off by burning coal, oil and gas dissolve in the rain.
Nitrogen oxides given off by cars burning petrol and oil also create nitrous
acid and add to the problem.

 How does acid rain form?