sulfur trioxide

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sul·fur tri·ox·ide

SO3; forms sulfuric acid, H2SO4, by its reaction with water.
Synonym(s): sulfuric oxide
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JIWET's certification process reviewed the plant's electrical efficiency; its exhaust heat recovery; and its ability to reduce atmospheric pollutants like particulate matter, nitrogen oxides and sulfuric oxides.
AQMD's "command and control" program established these limits so that the cost-per-ton of emission reduction would not exceed the following ceilings: $17,500 for Reactive Organic Gases (ROG); $24,500 for Nitrogen Oxides (NOx); and $18,500 for Sulfuric Oxides (SOx).