Car Sick

Just what is coming out of your car's exhaust and what is it doing to your health? The VW diesel emissions scandal has highlighted how little we know about cars and air pollution. But there are increasing claims and evidence that traffic pollution could be a major contributor to heart attacks and strokes, as well as asthma. Car use is also blamed for encouraging less active lifestyles, and contributing to the obesity epidemic. David Miller asks whether our love affair with the car is damaging our health, and reveals how little is being done to cut emissions on the streets.