Spy camera identifies polluting drivers

Drivers of vehicles that emit unacceptable levels of pollution could be targeted by a new weapon in the fight to improve air quality.

A spy camera capable of analysing exhaust fumes and recording number plates is being tested and reviewed by London transport bosses.

The Accuscan 4600 works by firing ultraviolet and infrared light across the road. It can scan 3,000 vehicles every hour and pinpoint transgressors in less than a second.