The third of six programmes that draw on past experience. In December 1952
London was caught in one of the worst smogs ever known. Four thousand people died of respiratory problems, hundreds more jammed the hospitals with 'fog cough'. Eventually the 1956 Clean Air Act was passed to solve the problem.
Charles Wheeler and his guests discover what lessons can be learnt from the past as we face the modern equivalent, photochemical smog. Producer Sue Davies