Silica dust from all of the finely pulverized glass and concrete were far and away the biggest threat. Add on to that all of the smoke and soot and other combustion by-products from everything that goes into a modern office building.

Silica dust from all of the finely pulverized class and concrete were far and away the biggest threat. Add on to that all of the smoke and soot and other combustion by-products from everything that goes into a modern office building.