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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Equally important, the emission of harmful gases into the atmosphere, including nitrous and sulfuric oxides and carbon dioxide, will be significantly reduced.
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.