Sulfur Dioxide - An acidic gas which dissolves in water to produce an acid. The acid is an important constituent of acid rain, which destroys plants, limestone and marble., Nitrogen Dioxide - An acidic gas which can encourage respiratory and bronchial illnesses., Carbon Dioxide - An excess build-up in the atmosphere enhances the greenhouse effect and leads to global warming., Carbon Monoxide - A toxic gas that causes suffocation and death., Lead Compounds - A poisonous element which can cause nerve damage.,

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