Identification of Factors Determining Household PM2.5 Variations at Regional Scale and Their Implications for Pollution Mitigation

环境科学 炉子 大气科学 分摊 室内空气质量 环境工程 地理 政治学 地质学 考古 法学
作者
Xinlei Liu,Yaojie Li,Zhihan Luo,Ran Xing,Yatai Men,Wenxuan Huang,Ke Jiang,Lu Zhang,Chao Sun,Longjiao Xie,Hefa Cheng,Huizhong Shen,Yuanchen Chen,Wei Du,Guofeng Shen,Shu Tao
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:57 (9): 3722-3732 被引量:4
标识
DOI:10.1021/acs.est.2c05750
摘要

Indoor PM2.5, particulate matter no more than 2.5 μm in aerodynamic equivalent diameter, has very high spatiotemporal variabilities; and exploring the key factors influencing the variabilities is critical for purifying air and protecting human health. Here, we conducted a longer-term field monitoring campaign using low-cost sensors and evaluated inter- and intra-household PM2.5 variations in rural areas where energy or stove stacking is common. Household PM2.5 varied largely across different homes but also within households. Using generalized linear models and dominance analysis, we estimated that outdoor PM2.5 explained 19% of the intrahousehold variation in indoor daily PM2.5, whereas factors like the outdoor temperature and indoor–outdoor temperature difference that was associated with energy use directly or indirectly, explained 26% of the temporal variation. Inter-household variation was lower than intrahousehold variation. The inter-household variation was strongly associated with distinct internal sources, with energy-use-associated factors explaining 35% of the variation. The statistical source apportionment model estimated that solid fuel burning for heating contributed an average of 31%–55% of PM2.5 annually, whereas the contribution of sources originating from the outdoors was ≤10%. By replacing raw biomass or coal with biomass pellets in gasifier burners for heating, indoor PM2.5 could be significantly reduced and indoor temperature substantially increased, providing thermal comforts in addition to improved air quality.

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