sulfur dioxide

noun

Definition of sulfur dioxide

: a heavy pungent toxic gas SO2 that is easily condensed to a colorless liquid, is used especially in making sulfuric acid, in bleaching, as a preservative, and as a refrigerant, and is a major air pollutant especially in industrial areas

Examples of sulfur dioxide in a Sentence

Recent Examples on the Web

For most of January, county officials urged residents in 22 municipalities in the Mon Valley nearby to limit outdoor activities out of concern for high levels of sulfur dioxide, and U.S. Steel has begun offering free health screenings. Kris Maher, WSJ, "Pittsburgh Air-Quality Problem Recalls the Bad Old Days," 12 Mar. 2019 In concert with a team of researchers from the U.S. and Japan, Benner has shown that when sulfur dioxide (likely off-gassed from volcanoes) reacts with formaldehyde, the result is a compound called hydroxymethanesultonate, or HMS for short. Jill Kiedaisch, Popular Mechanics, "Life on Earth May Have Been Born From a Maelstrom of Molten Iron," 15 Jan. 2019 Island residents are familiar with vog, or volcanic smog, which is formed when sulfur dioxide is emitted from erupting lava. Heidi Chang, latimes.com, "As lava pours into the ocean from Hawaii's Kilauea, a new risk surfaces: laze," 22 May 2018 There’s also potential for ash, steam and sulfur dioxide emissions. Washington Post, "Scientists: Kilauea volcano may have explosive eruption," 10 May 2018 Civil defense officials cautioned the public about high levels of sulfur dioxide near the volcano and urged vulnerable people to leave. CBS News, "Hawaii's Kilauea Volcano: New eruption triggers house fires," 4 May 2018 The introduction of market mechanisms to reduce sulfur dioxide emissions put the U.S. on a path to achieving air-quality levels that are the envy of most developed nations. C. Boyden Gray, WSJ, "Bush’s Proud Domestic Legacy," 4 Dec. 2018 Scientists have said higher sulfur dioxide emissions recorded at the volcano's vents in recent days are creating the potential for heavier than usual vog. Travis Fedschun, Fox News, "Hawaii volcano 'not safe' to roast marshmallows over, USGS says," 29 May 2018 Students were kept inside Wednesday morning, when sulfur dioxide emissions were high. Jennifer Sinco Kelleher, chicagotribune.com, "Final exams moved to gym as ash fills Hawaii classroom," 25 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sulfur dioxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of sulfur dioxide

1869, in the meaning defined above

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Last Updated

1 Apr 2019

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The first known use of sulfur dioxide was in 1869

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More Definitions for sulfur dioxide

sulfur dioxide

noun

English Language Learners Definition of sulfur dioxide

chemistry : a gas that has a strong smell, that is used in many industries, and that contributes to air pollution

sulfur dioxide

noun

Medical Definition of sulfur dioxide

: a heavy pungent toxic gas SO2 that is easily condensed to a colorless liquid, is used especially in making sulfuric acid, in bleaching, as a preservative, and as a refrigerant, and is a major air pollutant especially in industrial areas

More from Merriam-Webster on sulfur dioxide

Britannica.com: Encyclopedia article about sulfur dioxide

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