Urban air pollution, much of it caused by road traffic emissions, is one of Europe's most widespread environmental problems. Research suggests that a minority of vehicles contribute to a disproportionate amount of pollution, with perhaps 10% of cars generating 50% of emissions. This project demonstrates the use of remote sensing equipment that identifies such gross polluters, and investigates links between traffic flows and road-side air quality. It includes educational activities that raise public awareness of air pollution. Southwark is a busy, built-up area of London which includes a major road corridor carrying traffic from Kent and the South-East into the centre of the city.