The level of air pollution caused by vehicles across Sheffield is being monitored at sites across the city.
BBC: Traffic pollution tested across Sheffield
The majority of the pollution is caused by vehicles on the road and experts say reducing traffic in the cities is the best way of improving air quality.
BBC: Air pollution fears in Leicester and Nottingham
In the long run, though, it seems the train has reduced the pollution formerly caused by cars and trucks and reduced the number of animals killed by vehicles driving through the park.
BBC: Eco-scorecard to the world��s great attractions
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