Sulfur dioxide is discharged from cobustion coal and Industrial operation that use of sulfur for their process. Like on the production of carbon dioxide, carbon source such as coke is burned to react with sulfur. Some sulful also will react with oxygen to be sulfur dioxide.
Sulfur dioxide gas that flow out to the atmosphere then poisonous to the animal and plant. Sulfur dioxide on atmosphere can react with oxygen on the air to be a sulfur trioxide that very acid chemicals. This chemical than react with water to be sulfuric acid and will down when it rain. The rain that contaminated with sulfuric acid can say as acid rain. This water can make many plant die and will contaminated the lagoon and river that can make fish die.
Some plant have waste treatment to process this flue gas into a friendly gas before they through away to the atmosphere, but on certain time this waste gas treatment can stop and will flow out dangerous gas to the atmosphere. If this gas then go to the municipal can make them being poisonous.
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