Highways Agency studies Dutch scheme using ‘cantilevered canopies’ covered with pollution-absorbing material in effort to improve air quality

Major roads could be turned into tunnels covered with pollution-absorbing material in an effort to cut emission fumes and improve air quality.

Highways Agency officials are studying a Dutch scheme in which cantilevered canopies are constructed over the most polluted sections of road to prevent local residents breathing in noxious car fumes.

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