This chapter examines the formation of acid rain and its impact on the environment. Waste gases discharged from chemical factories and power stations are usually released into the atmosphere. These gases combine with water vapour in clouds and form sulphuric and nitric acids. When rain falls, it is highly acidic, with a pH value of 5.6 or less. Acid rain can cause damage to buildings, trees and plants, and the marine environment. In Southern Norway, trout population had been lost by acidification in 2,800 lakes. In Sweden, 15,000 lakes are acidified and of these, 4,500 are fishless.
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