Lamma Island Power Station is a coal and gas-fired power station, the second largest in Hong Kong. Built in 1982, it provides power to Hong Kong Island. Lamma island is a pristine setting where cars are not allowed but it is the site of a coal-fired polluting power station whose chimneys tower over the beach where locals walk, play and swim. Electricity generation is one of the major sources of air pollution in Hong Kong. Air Pollution from coal-fired power plants comes from the emission of gases such as carbon dioxide (CO2), a greenhouse gas which is a contributor to global warming and climate change. Acid rain is caused by the emission of nitrogen oxides and sulfur dioxide into the air. Coal ash produced by coal-fired power plants has contaminated ground water with toxic elements, such as arsenic and lead.