Inadequate natural ventilation at Drumchapel High and Rosshall Academy, two of the first Scottish schools built by public private partnerships, had caused particular problems for information technology, drama and home economics classes.
Cyril Clements, a science teacher at Drumchapel High (pictured), analysed the problems in detail. Bob Dow, a maths teacher at St Margaret Mary's Secondary, used his position as the Educational Institute of Scotland's health and safety representative in Glasgow to push for improvements.
Ian Tasker, the STUC assistant secretary, said: "What really struck us was the length of time they've had to fight - seven years - for improvements that are now beginning to happen."
Photograph: Chris JamesEpicscotland.