Pollution-reducing material to be used in makeshift tunnels

PLEASE NOTE: LONG EXPOSURE EFFECT WAS USEDA view of the traffic moving around the Darenth Interchange on the M25 motorway near Dartford in Kent.
PLEASE NOTE: LONG EXPOSURE EFFECT WAS USEDA view of the traffic moving around the Darenth Interchange on the M25 motorway near Dartford in Kent.

'Pollution tunnels' could be used on motorways in England to cut levels of dangerous pollutants near residential areas.

Highways England said that it had previously performed tests on such a system on the M62 near Manchester in 2015, using a nitrogen dioxide absorbent polymer to soak up toxic gases.