daniel sandford, bbc news, at the old bailey.n for his flat cap, wellies and wax jacket, steve halliwell played the head of the dingle household for 27 years. before retraining as an actor, steve halliwell had worked in cotton and paper mills. the effects of air pollution on our hearts and lungs are well—documented — but there's growing evidence that different pollutants also affect our brains. a team of scientists is trying to work out which everyday elements have the worst effect. our science editor rebecca morelle has been to see the study getting underway. breathing in polluted air in the name of science. briony evans is a volunteer at this manchester university lab, where scientists are trying to learn about the impact of fumes on the brain. here we've got everything that we need to conduct the experiments, to expose the participants to air pollution. the team is looking at four different kinds of pollution — diesel from an engine, cleaning products, wood smoke and cooking fumes from a pork chop. the pollutants are carefully