Finding:

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   Sulfur dioxide

   Sulfur dioxide (also sulphur dioxide) is the chemical compound with the formula SO2. It is produced by volcanoes and in various industrial processes.
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   Acid Rain Program

   But instead of using or trading them, A.R.R.F. retires them permanently, taking allowances off the market and keeping sulfur dioxide out of the air.
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   Io (moon)

   Plume deposits on Io are often colored red or white depending on the amount of sulfur and sulfur dioxide in the plume.
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   Sulfur

   Sulfur burns with a blue flame that emits sulfur dioxide, notable for its peculiar suffocating odor due to dissolving in the mucosa to form dilute sulfurous acid.
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   Sulfuric acid

   The reaction with iron (shown) is typical for most of these metals, but the reaction with tin is unusual in that it produces sulfur dioxide rather than hydrogen.
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   Volcanism on Io

   While most lavas on Io are made of basalt, a few lava flows consisting of sulfur and sulfur dioxide have been seen.
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   Flue gas desulfurization

   Sulfur dioxide is responsible for acid rain formation. ... When burned, about 95 percent or more of the sulfur is generally converted to sulfur dioxide (SO2).
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   Volcano

   Large, explosive volcanic eruptions inject water vapor (H2O), carbon dioxide (CO2), sulfur dioxide (SO2), hydrogen chloride (HCl), hydrogen fluoride (HF) and ash (pulverized rock and pumice) into the stratosphere to heights of 16–32 kilometres (10–20 mi) above the Earth's surface.
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   Air pollution

   Before flue gas desulfurization was installed, the emissions from this power plant in New Mexico contained excessive amounts of sulfur dioxide.
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    Atmosphere of Venus

    Sulfuric acid is produced in the upper atmosphere by the sun's photochemical action on carbon dioxide, sulfur dioxide, and water vapor.

Explore the following pages on Powerset:

• Sulfur dioxide,
• Acid Rain Program,
• Io (moon),
• Sulfur,
• Sulfuric acid,
• Volcanism on Io,
• Flue gas desulfurization,
• Volcano,
• Air pollution,
• Atmosphere of Venus