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You would need to take a sample of it to an indoor air quality testing lab or have a testing co come check out your unit to find out. There are always negative pressures in apt bldgs as heat rises and with it air and dirt moves. Unstoppable unless you seal your doors very tight. In large bldgs they pressurize the hallways with a makeup air unit from outside and for ventilation. Cement block bldgs are worse if they are hollow core as air rises thru the core and between the cracks and creates a draft in your unit. I have some 50 yr old cinder block walled condos and there is such a strong draft thru them that water pipes can freeze internally in the bldg if the draft is not stopped. That dirt is not good for your health so you may want to look into a room air purifier with a HEPA filter, Oreck and Bionaire etc make them. Get the bath fan fixed as once you get mold on surfaces and in walls it is next to impossible to get rid of.
http://www.oreck.com/Air-Purifiers
http://www.bionaire.com/Category.aspx?cid=46
http://www.oreck.com/Air-Purifiers
http://www.bionaire.com/Category.aspx?cid=46