noun
EXAMPLES FROM CORPUS
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Apart from general operating conditions, it has set emission limits for sulphur dioxide , nitrogen dioxide and carbon monoxide.
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Findings include: Some 600 million people live in urban areas where the average level of sulphur dioxide pollution endangers their lives.
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Levels of sulphur dioxide in the air reached 2,400 microgrammes per cubic metre over the weekend.
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Much progress has been made countrywide to reduce sulphur dioxide levels, which have fallen by nearly half since 1970.
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The sulphur dioxide level in Belfast was 32 parts per billion while the nitrogen dioxide level was 48.
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The fires produced 20,000 to 40,000 tonnes of sulphur dioxide as well as many thousands of tonnes of oxides of nitrogen.
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This stipulates that emissions of sulphur dioxide must be cut to 10 million tonnes below 1980 levels by the year 2000.