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Sulphur dioxide levels in the atmosphere can be reduced by using:

1. catalytic converters in industry
2. Static electricity to attract it in Factory chimneys
3. More efficient car-engines.
4. Low-sulphur fuels

Correct answer: Low-sulphur fuels

Solution

Sulphur dioxide is produced when sulfur in fuel burns, so using fuel with less sulfur directly reduces the amount formed. The other options may help with other pollutants, but they do not specifically cut SO2 as effectively.

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