Final answer:
Sulfur dioxide is a secondary pollutant formed by the combustion of sulfur or sulfur compounds, contributing to environmental problems.
Explanation:
Sulfur dioxide is a secondary pollutant that is formed by the combustion of sulfur or sulfur compounds. It is a colorless and poisonous gas and a major contributor to environmental issues. When sulfur dioxide reacts with other chemicals in the atmosphere, it leads to the formation of secondary pollutants.
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