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The virus is not airborne, it propagates via aerosol so it is very short lived "in the air" and over surfaces.

> A lot of people live in either a city or a suburban area and most apartments and houses aren't air tight. Wouldn't your breath get circulated out of your apartment, mixed in with the outside air and drift over to your neighbor -- or is the virus not that susceptible to spreading?

Not an expert, but if I understand correctly the virus would be unlikely to survive that long outside the body. Even in the cruise ship which was docked in Japan, which would be a bit of a "worst-case" scenario for the transmission you describe, most people didn't get sick.

Coronavirus is possible to transmit via aerosol but not airborne. They differ in the transmission distance, among other things. Virus are infectious only when you receive a certain amount (Viral load). It is possible the virus loaded aerosol drift far away, but the density would become lower the further they drift.