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Well, this issue recently came up regarding my apartment as well. The building is 10 years old, I think the ductwork should have been cleaned. My apartment manager said no. I did read up on ductwork at the US EPA website and feel better now. There is no evidence that dirty ductwork is harmful at all, due to the fact that the dust sticks to the walls. More pollutants are coming in and out with me and my dog than the ductwork. I had a company lined up to clean the ductwork-which I was gong to to pay for myself-but canceled themafter reading what the EPA says. Look it up...very useful info!