Areason that many city workers lived in unhealthy conditions was there was no garbage collection or sewage service. people from rural areas introduced new diseases. landlords were not allowed to improve their buildings. people often did not clean up after themselves.

A reason that many city workers lived in unhealthy conditions was there was no garbage collection or sewage service. The correct option among all the options that are given in the question is the first option. This unhygienic condition resulted in diseases that spread very quickly. People were forced to live under such pathetic conditions.