There are a number of potential sources for indoor air quality problems in Baltimore. First is poor ventilation in the building with either a lack of outdoor air being cycled into the building or contaminated air being brought into the building. Next is a failure to do proper maintenance for the HVAC system. Another possible cause is moisture damage that isn’t handled, such as from a storm or high humidity. If there are construction or remodeling activities going on in the building, this could affect indoor air quality. And generally, if the air both indoors and outdoors is already contaminated, indoor air quality will suffer.