I might just be paranoid, but recently there's been a strange smell in the house I live in which I determined to be coming from the air vents, because I smell it most every time the heat comes on. Because of this, I'm almost certain it's the smell of my dogs feces who defecates in the basement at times. If this is the case, would this be dangerous to my health from possible E. Coli in the air?

Thank you in advance.