What are the health side effects of concrete demolition  dust to humans? I arrived at work to see all employees outdoors due to a visible amount of airborne dust in the office. It was the apparent result of concrete demolition in an annex to the building.  Some have complained of throat discomfort and one of headache. What are known side effects to this kind of exposure?  Wallboard was not a factor. Doors are open. Industrial fans were on for about two hours. Is there cause for alarm?

Summarized question: How much exposure to concrete dust is dangerous and what damage could it cause?