sulfur dioxide
Pronunciation
Noun
B1 Intermediate
Quick answer
A sharp-smelling gas released when fuels containing sulfur are burned, known for contributing to acid rain.
Usage notes
Its chemical formula, SO2, appears often in environmental science texts alongside carbon dioxide.
Test yourself
Which word fits the gap? "Factories are required to filter out _____ before releasing exhaust into the air."
Answer: sulfur dioxide
In your own words, what does "sulfur dioxide" mean?
A sharp-smelling gas released when fuels containing sulfur are burned, known for contributing to acid rain.
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