Portable ultrasonic humidifier exacerbates indoor bioaerosol risks by raising bacterial concentrations and fueling pathogenic genera.
Portable ultrasonic humidifier exacerbates indoor bioaerosol risks by raising bacterial concentrations and fueling pathogenic genera.
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DOI：
10.1111/ina.12964
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发表时间：
2021-11
期刊：
影响因子：
5.8
通讯作者：
Zili Yang;Lu-An Chen;Chuanjun Yang;Yuqian Gu;Rong Cao;K. Zhong
中科院分区：
文献类型：
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作者：
Zili Yang;Lu-An Chen;Chuanjun Yang;Yuqian Gu;Rong Cao;K. Zhong
便携式超声波加湿器经常用于加热房间，以缓解空气干燥。然而，它也带来了严重的健康问题，如“加湿器热”，因为加湿空间中的生物气溶胶浓度和群落可能在居住者注意到之前迅速改变。我们比较了加湿器的蓄水池中的微生物增殖率，并研究了超声波加湿器在两周加湿过程中对室内细菌和真菌气溶胶的时间浓度、粒径分布和群落变化的影响。室内细菌气溶胶浓度呈指数增长，集中在呼吸道大小范围内（≤1.1 µm），并与加湿水平成正比，一周内很快超过1000 CFU/m3（RH = 70%），而真菌浓度始终保持较低（≤177 CFU/m3）。室内生物气溶胶群落，显着相关的加湿器水，大大扭曲加湿后，致病假单胞菌占主导地位。（40.50%），短波单胞菌属（Brevundimonas spp.）(3.02%）、不动杆菌属（Acinetobacter spp.）(0.98%）和军团菌属（Legionella spp.）(0.69%).我们的研究结果表明，超声波加湿通过提高细菌浓度和助长致病菌属来污染室内空气。为将暴露风险降至最低，居住者应避免长期和过度加湿（RH ≥ 70%），并每周清洁超声波加湿器。
Portable ultrasonic humidifiers are frequently used in heating rooms to ease air dryness. However, it has also posed serious health concerns such as "humidifier fever" because the bioaerosol concentration and community in the humidified space may alter quickly before the occupants could even notice. We compared the microbial proliferation rates in the humidifiers' reservoirs filled with three commonly used water types and investigated the impacts of the ultrasonic humidifiers on the temporal concentration, size distribution, and community variations of indoor bacterial and fungal aerosols during two-week humidification. The concentration of indoor bacterial aerosols increased exponentially, concentrating in the respiratory size ranges (≤1.1 µm), and was proportional to the humidification level, which soon exceeded 1000 CFU/m3 in one week (at RH = 70%), while the fungal concentration always remained low (≤177 CFU/m3 ). The indoor bioaerosol community, significantly associated with the humidifier water, was substantially distorted after humidification and dominated by the pathogenic Pseudomonas spp. (40.50%), Brevundimonas spp. (3.02%), Acinetobacter spp. (0.98%) and Legionella spp. (0.69%). Our results show that ultrasonic humidification contaminates indoor air by raising bacterial concentrations and fueling the pathogenic genera. To minimize the exposure risks, occupants should avoid long-term and excessive humidification (RH ≥ 70%) and clean the ultrasonic humidifier weekly.