ABSTRACT The air quality in caring rooms of hospitals is one of important things that have to be considered regarding to the prevention of nosocomiat infection. The examination results of air bacterial num¬ber in the caring room of PKU Muhammadiyah Hospital of Bantu! in 11 February 2013, still ex¬ceeded the maximum threshold permitted by the regulation, i.e. 200-500 CFUlm3. One of the alte…