Hygienic Status of Centralized Air Conditioning Ventilation System in Public Places of JiNan City during 2011-2015

Objective  To analyze the hygienic status of centralized air conditioning ventilation system in public places of Jinan city.

Methods  To detect and analyze hygienic indicators for central air conditioning ventilation system in 127 public places according to the Hygiene Specification for Central Air Conditioning Ventilation System in Public Buildings.

Result  The qualified rate for the central air-conditioning system in these 127 public places was 51.2%, and the qualified rates in each year was different (P<0.01). The qualified rate of total bacteria counts and total fungi counts in blasting air were 71.2% and 85.4%%, respectively. The qualified rate of dust amount, total bacteria counts and total fungi counts on the inner surface of air duct were 98.4%, 99.2%and 100%, respectively. The detection rate of legionella pneumophila in cooling water was 30% and LPl was the main type of Legionella pneumophila, accounting for 58.3%.

Conclusion  The qualified rates of central air conditioning and ventilation system in public places of Jinan was low; cleaning and managing ventilation system should be strengthened.