The families in Sheffield took part in a test to see who has inhaled more pollution on the school street: children on foot, by bike or by car.
The experiment allowed three families to bring air quality monitors to school to measure PM2.5 levels. These are small air pollutants that are about 30 times thinner than human hair.
It was found that every means of transport exceeded the safety limit recommended by the World Health Organization, but which was the worst?
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