The emission of gases such as carbon monoxide (CO), oxides of nitrogen (NOx), hydrocarbons (HCs) and sulphur dioxide (SO2) into the air can cause undesirable health effects. These gases interact to form ozone, which can cause breathing difficulties and asthma. This chapter discusses the laws implemented by governments to prevent air pollution. The Clean Air Act of 1956 regulated the height of chimneys and introduced a new concept of ‘smoke control areas’. Governments also banned the use of tetraethyl lead (TEL) in petrol or made leaded petrol more expensive.
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