By Chiara Fiorillo Pollution has devastating effects on people’s health and is considered one of the world’s largest environmental problems. A recent fieldwork study has revealed Stoke-on-Trent has the worst air-polluted city centre in the country. Recordings taken at high streets in the 25 largest towns and cities in the county over a two-week period found that 76 per cent are exceeding the World Health Organisation’s recommended annual level of air pollution – but other towns and cities had more than double this level, including Newcastle, Leicester, Coventry, Hull and Bradford. At the other…