The smoke seen from Hanson Cement, which many residents say is more than just steam Residents in the Ribble Valley have raised concerns about air pollution levels in one of their towns which they claim are being made worse by a cement works. Luke Tyrell, who lives in Clitheroe claims that Hanson Cement, previously Castle Cement, on West Bradford Road, is pumping nitrogen oxide into the atmosphere and poisoning the area. Mr Tyrell, who lives close to Bawdlands, said the issue had been ongoing for more than a decade, with thick black smoke coming from the cement works being passed off as steam by bosses of the company.