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29. Role of ventilation and cleaning for controlling house dust mite allergen infestation : A study on associations of house dust mite allergen concentrations with home environment and life styles in Tianjin area, China

Author

Sun, Yuexia, Cui, Lianwang, Hou, Jing, Luo, Shugang, Norbäck, Dan, Sundell, Jan, Sun, Yuexia, Cui, Lianwang, Hou, Jing, Luo, Shugang, Norbäck, Dan, and Sundell, Jan

Abstract

House dust mites produce well-known allergens for asthma and allergy among children. To study house dust mite allergen exposure level in northeast China and characterize its association with indoor environmental factors and cleaning habits, we inspected 399 homes in Tianjin area and collected dust from mattresses. Dermatophagoides farinae (Der f) and Dermatophagoides pteronyssinus (Der p) were detected by the enzyme-linked immunosorbent assay (ELISA) method. The medians of total allergen concentrations for spring, summer, autumn, and winter were 524 ng/g, 351 ng/g, 1022 ng/g, and 1010 ng/g. High indoor air relative humidity (RH), low air change rate, indoor dampness, and frequent changing of quilt cover/bedsheet/pillow case were significantly associated with high house dust mite allergen concentration (relative risk [RR]: RH, 1.18-1.34; air change rate, 0.97-1.00; dampness, 2.92-3.83; changing quilt cover/bedsheet/pillow case, 0.66-0.75). The decrease in the absolute humidity gradient between indoors and outdoors that occurs with increased air change rate may explain why a high ventilation reduces house dust mite allergen concentration. The findings of this study show the importance of ventilation and cleaning for controlling house dust mite allergens. We found that the decrease in additional absolute humidity (e.g., humidity (indoor)-humidity (outdoor)) with increased air change rate may be the main reason that a high ventilation rate reduces house dust mite allergen concentration. Ventilation and cleaning should be both considered for creating a healthy home environment.

Published
2022
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30. Eczema, facial erythema, and seborrheic dermatitis symptoms among young adults in China in relation to ambient air pollution, climate, and home environment.

Author

Wang, Juan, Zhang, Yinping, Li, Baizhan, Zhao, Zhuohui, Huang, Chen, Zhang, Xin, Deng, Qihong, Lu, Chan, Qian, Hua, Yang, Xu, Sun, Yuexia, Sundell, Jan, Norbäck, Dan, Wang, Juan, Zhang, Yinping, Li, Baizhan, Zhao, Zhuohui, Huang, Chen, Zhang, Xin, Deng, Qihong, Lu, Chan, Qian, Hua, Yang, Xu, Sun, Yuexia, Sundell, Jan, and Norbäck, Dan

Abstract

A questionnaire survey on dermal symptoms and home environment was performed in eight Chinese cities (40 279 participants). Data on city level temperature, precipitation, PM10 , NO2, and gross domestic product (GDP) per capita were collected. In total, 2.2% had eczema, 2.4% facial erythema (FE) and 2.6% seborrheic dermatitis symptoms (SD). Higher temperature was associated with eczema (OR = 1.09). Higher GDP per capita was related to less SD. Higher PM10 was related to SD. Suburban living was protective for eczema (OR = 0.77) (vs. urban). Living in old buildings (built before 1991) was related to eczema (OR = 1.42). Living near heavily trafficked roads was related to FE (OR = 1.33) and SD (OR = 1.35). Having new furniture was related to all symptoms (OR = 1.26-1.47). Burning mosquito coils (OR = 1.37-1.57) and incense (OR = 1.33-1.37) were associated with eczema, FE, or SD. Presence of cockroaches and rats/mice was associated with FE or SD (OR = 1.31-1.40). Using air conditioner, daily cleaning and frequently exposing bedding to sunshine were protective (OR = 0.60-0.83). In conclusion, higher temperature, higher PM10 , urban living, living near heavily trafficked roads, old buildings, new furniture, burning mosquito coils and incense, and presence of cockroaches/rats/mice increased the risk of eczema, FE, or SD. Higher GDP, air conditioner, daily cleaning, and exposing bedding to sunshine were protective.

Published
2022
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44. Ten cities cross-sectional questionnaire survey of children asthma and other allergies in China

Author

Zhang, YinPing, Li, BaiZhan, Huang, Chen, Yang, Xu, Qian, Hua, Deng, QiHong, Zhao, ZhuoHui, Li, AnGui, Zhao, JiaNing, Zhang, Xin, Qu, Fang, Hu, Yu, Yang, Qin, Wang, Juan, Zhang, Ming, Wang, Fang, Zheng, XiaoHong, Lu, Chan, Liu, ZhiJian, Sun, YueXia, Mo, JinHan, Zhao, YiLi, Liu, Wei, Wang, TingTing, Norbäck, Dan, Bornehag, Carl-Gustaf, and Sundell, Jan

Published
2013
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