Third of a six-part magazine series investigating the relationship between science and modern society.
Research implies that 10,000 people could be dying from the traffic pollution in Britain each year. Presenter David Malone discovers that Britain has just seven EU-approved pollution measuring sites, compared with Germany's 200, and that there are no national standards for ozone or nitrogen dioxide levels. Will Britain have to follow the example of smog-filled Athens, where residents wear face masks in the summer?
He also investigates the environmental row between Greenpeace and the chemical industry over chlorine, the basis of some of the most common chemicals in the world. Some feel it may be the cause of decreasing fertility in men, as sperm counts have halved since the Second World War.
Finally, David meets philosopher Ed Regis to talk about the science of nanotechnology. Scientists can now write the contents of four encyclopedias on a pin. How far will nanotechnology be able to transform human society?