Sulfur dioxide is a colorless gas with a pungent odor. It is a liquid when under pressure, and it dissolves in water very easily. Sulfur dioxide in the air comes mainly from activities such as the burning of coal and oil at power plants or from copper smelting
A thermal power station that burns coal to produce electricity is known as a coal-fired power station or coal power plant. Around 8,500 coal-fired power plants with a combined capacity of over 2,000 gigawatts are present worldwide.
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