The Health and Safety Authority has examined conditions in 31 schools since the start of the year, it emerged today.
Labour Party spokeswoman on education, Ms Jan O'Sullivan, said figures obtained from the Department of Enterprise, Trade and Employment, show 19 primary and 12 secondary schools were investigated.
"The inspections would usually be instigated by complaints from teaching staff about their working conditions and those of their pupils," Ms O'Sullivan said.
"It is a shocking indictment of the condition of many school buildings, classrooms and staff rooms that so many schools are the subject of inspection and investigation," she added.