Science Dictionary
sulfur dioxide  
A colorless, poisonous gas or liquid with a strong odor. It is formed naturally by volcanic activity, and is a waste gas produced by burning coal and oil and by many industrial processes, such as smelting. It is also a hazardous air pollutant and a major contributor to acid rain. Chemical formula: SO2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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WordNet
sulfur dioxide

noun
a colorless toxic gas (SO2) that occurs in the gases from volcanoes; used in many manufacturing processes and present in industrial emissions; causes acid rain 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Sulfur dioxide and closely related chemicals are known primarily as a cause of
  acid rain.
Likewise, acid rain from sulfur dioxide pollution has destroyed much of the
  vegetation in the area.
Sulfur dioxide combines with water vapor to form sulfuric acid particles that
  scatter, reflect, and absorb sunlight.
Renewable diesel also creates far fewer sulfur dioxide, particulate, and
  nitrogen oxide emissions.
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