OCCUPATION AND HEALTH ›› 2026, Vol. 42 ›› Issue (14): 1975-1979.

• Treatise—Environment and Health • Previous Articles     Next Articles

Analysis of monitoring results of heat,ventilation,and air conditioning systems in public places in Beijing from 2015 to 2023

HE Liwei, JIA Yuping, CAO Wenjing, DU Chenlei, YAO Xiaohui, ZHAO Rui()   

  1. Beijing Center for Disease Prevention and ControlBeijing 100013, China
  • Received:2025-09-05 Revised:2025-10-29 Online:2026-07-15 Published:2026-07-16
  • Contact: ZHAO Rui,E-mail:zhaorui_0@126.com

Abstract:

Objective To investigate the sanitary condition of heating,ventilation,and air conditioning(HVAC) systems in public places in Beijing,including the fresh air volume,supply air quality,the sanitary status of system components,and Legionella pneumophila contamination. The influencing factors were also analyzed to provide data support and a scientific basis for enhancing the sanitary management of HVAC systems in public places. Methods The monitoring data of total bacterial count(TBC),total fungal count(TFC),β-hemolytic streptococcus(BHS) and inhalable particles(PM10) in the supply air,TBC,TFC,and dust accumulation on the surface of the air condition parts,Legionella pneumophila in cooling/condensate water and fresh air volume rate per person of HVAC systems in public places in Beijing from 2015 to 2023 was summarized and analyzed. Results The overall qualification rate of HVAC systems in public places in Beijing remained stable from 2015 to 2023,with an overall qualification rate of 92.83%(23 564/25 385). The qualification rate in urban and non-urban areas was 93.30% and 92.09%,respectively,with urban areas having a higher qualification rate than non-urban areas(χ2=13.323,P<0.05). The qualification rates of hospital waiting room,accommodation,shopping center and other places were 89.76%,93.49%,95.41% and 97.24%,respectively,showing a statistically significant difference(χ2=279.030,P<0.05). The qualification rates of TBC,TFC in air supply and fresh air volume rate per person were 72.29%,82.34% and 85.69%,respectively,while qualification rates for other indicators exceeded 90%. The qualification rates of TBC,TFC,BHS and PM10 in the supply air of air handling unit(AHU) systems were higher than those of fan-coil unit(FCU) with fresh air systems(χ2=62.319,35.858,7.483,7.755,all P<0.05). Conclusion The overall qualification rate of HVAC systems in public places in Beijing was at a high level from 2015 to 2023. However,it is still necessary to pay attention to the quality of air supply and enhance management.

Key words: Environmental health, Public place, Indoor environment, Heat, ventilation, and air conditioning system, Supply air quality, Legionella pneumophila

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