Suggest three ways in which air pollution from vehicles can be reduced.

Fit catalytic converters, which convert carbon monoxide and oxides of nitrogen into less harmful gases, and enforce emission standards with regular checks. Use cleaner fuels such as compressed natural gas or electricity in place of diesel and petrol. Improve public transport and encourage cycling and walking so that fewer private vehicles are used.

No citable source has been recorded for this record. Treat it as practice material, not as fact.

Explanation

Keeping engines properly tuned reduces emissions considerably at no extra cost.