Caught a news clip this morning. Those new fluorescent light bulbs contain mercury. They didn't say how much only that the 'vapor' was measurable. If you should break one, they said to open a window, use gloves and a pieces of thin cardboard to sweep up the pieces. Use a folded, dampened paper towel to pick up the small pieces. Put it all into a zip loc bag & dispose of properly. DO NOT USE A VACUUM CLEANER.