Some vehicles are much more polluting than others and the design of exhaust pipes could affect how much air pollution we breathe when we walk along a busy road, research has found.

Diesel vehicles still dominate exhaust pollution 10 years after the International Council on Clean Transportation revealed that many diesel cars were highly polluting, emitting far more nitrogen oxides on the road than in official testing.

Prof David Carslaw, from the University of York, led a team that measured the exhaust from 38,000 vehicles in Milan and York.

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