Live in one bedroom condo, landlord recently installed a new heating and air conditioning unit, since it was installed there is black soot coming from all of the vents in the house. It looks like we painted the walls and ceilings blackish grey where the vents are. It is on everything in the house, ITS VERTYWHERE, ON ALL SURFACES, INSIDE DRAWSIN KITCHEN. THERE IS BLACK SOOT EVERYWHERE. IS THIS DANGEROUS TO BE BREATHING IN?

Sure it is.

Did you tell him about this?