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I am a renter in a beautiful duplex brownstone in Carroll Gardens. We have exposed brick walls in the kitchen, with a non-working brick fireplace. The owner has chosen not to seal the interior brick. Although this adds charm to the kitchen, I worry about the health hazards of the crumbling brick for my family. I have a 2yr old and new born. I don’t mind the clean-up, but does anyone know if there is any immediate health hazards for old crumbling brick (interior) walls?