Another camera is likely to be trained on an industrial chimney in Rugby to monitor chemicals which pour out.  Rugby borough council officers have recommended an extra CCTV camera at Beechwood Courts flats in the town to film the chimney at Rugby Cement, in Lawford Road.   The council"s environmental health director, Karen Stone, said: "While pollution incidents should be detected by the air quality monitoring network, the stack camera will allow a back-up system and may aid in determining the cause of any pollution incident."   Councillors will be asked to approve the plan next Wednesday.  In September, members of pollution protest group Rugby in Plume put up their own camera to film the chimney.  The images are shown live at   www.stackcam.co.uk