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The really interesting question is "why would you care?"
Our diets today contain far less toxic material than they used to, and our ancestors did OK.We no longer need to eat food that's only marginally fit for consumption and our water supply is clean.
When I was at school, we messed around with mercury in the physics class with no precautions at all. I hate to think how much was pooled under the floorboards, filling the classroom with mercury vapour overnight...
There are a growing number of cases of teachers and adult school workers who have asbestos-related diseases because of exposure in their schools. One study from the National Center for Health Statistics listed elementary school teachers as a high risk occupation for developing mesothelioma