选取典型的室内公共场所,按照室内空气检测标准进行布点采样,检测这些场所的C02浓度及采样时的温度、湿度及空气流速结果发现,商场内C02浓度基本都在标准限值内,超市内C02浓度超标严重,且C02分布与超市内采样层区之间无明显的相关性。...选取典型的室内公共场所,按照室内空气检测标准进行布点采样,检测这些场所的C02浓度及采样时的温度、湿度及空气流速结果发现,商场内C02浓度基本都在标准限值内,超市内C02浓度超标严重,且C02分布与超市内采样层区之间无明显的相关性。其它类型场所C02分布各有差异,但浓度值基本在标准限度值上下浮动统计结果:公共场所内影响C02浓度的主要原因是空气流速与人群密度的大小空气流速越快,C02浓度越低;人群密度越大,C02浓度越高此外,根据,James L Repace理论进行分析发现,各类公共场所空气交换状况均较差,存在威胁人们健康的风险。展开更多
Indoor airborne bioaerosols of outdoor origin play an important role in determining the exposure of humans to bioaerosols because people spend most of their time indoors. However, there are few studies focusing on ind...Indoor airborne bioaerosols of outdoor origin play an important role in determining the exposure of humans to bioaerosols because people spend most of their time indoors. However, there are few studies focusing on indoor bioaerosols originating from outdoors. In this study, indoor versus outdoor size-resolved concentrations and particle asymmetry factors of airborne fluorescent bioaerosols in an office room were measured continuously for 6 days （144 h） using a fluorescent bioaerosol detector. The windows and door of this room were closed to ensure that there was only air infiltration; moreover, any human activities were ceased during sampling to inhibit effects of indoor sources. We focused on fine particles, since few coarse particles enter indoor environments, when windows and doors are closed. Both indoor and outdoor fluorescent bioaerosol size distributions were fit with two-mode lognormal distributions （indoor R2 = 0.935, outdoor R2 = 0.938）. Asymmetry factor distributions were also fit with lognormal distributions （indoor R2 = 0.992, outdoor R2 = 0.992）. Correlations between indoor and outdoor fluorescent bioaerosol concentrations show significant concentration-attenuation and a time lag during the study period. A two-parameter, semi-empirical model was used to predict concentrations of indoor fluorescent bioaerosols of outdoor origin. The measured and predicted concentrations had a linear relationship for the studied size fractions, with an R2 for all size fractions of larger than 0.83.展开更多
文摘选取典型的室内公共场所,按照室内空气检测标准进行布点采样,检测这些场所的C02浓度及采样时的温度、湿度及空气流速结果发现,商场内C02浓度基本都在标准限值内,超市内C02浓度超标严重,且C02分布与超市内采样层区之间无明显的相关性。其它类型场所C02分布各有差异,但浓度值基本在标准限度值上下浮动统计结果:公共场所内影响C02浓度的主要原因是空气流速与人群密度的大小空气流速越快,C02浓度越低;人群密度越大,C02浓度越高此外,根据,James L Repace理论进行分析发现,各类公共场所空气交换状况均较差,存在威胁人们健康的风险。
基金This work was supported by the National Key Research and Development Plan from the Ministry of Science and Technology of China through Grant No. 2016YFC0700500, as well as funding from Innovative Research Groups of the National Natural Science Foundation of China （No. 51521005）, and the National Natural Science Foundation of China （No. 51678328 ＆ 21221004 ＆ 41227805 ＆ 21190054）.
文摘Indoor airborne bioaerosols of outdoor origin play an important role in determining the exposure of humans to bioaerosols because people spend most of their time indoors. However, there are few studies focusing on indoor bioaerosols originating from outdoors. In this study, indoor versus outdoor size-resolved concentrations and particle asymmetry factors of airborne fluorescent bioaerosols in an office room were measured continuously for 6 days （144 h） using a fluorescent bioaerosol detector. The windows and door of this room were closed to ensure that there was only air infiltration; moreover, any human activities were ceased during sampling to inhibit effects of indoor sources. We focused on fine particles, since few coarse particles enter indoor environments, when windows and doors are closed. Both indoor and outdoor fluorescent bioaerosol size distributions were fit with two-mode lognormal distributions （indoor R2 = 0.935, outdoor R2 = 0.938）. Asymmetry factor distributions were also fit with lognormal distributions （indoor R2 = 0.992, outdoor R2 = 0.992）. Correlations between indoor and outdoor fluorescent bioaerosol concentrations show significant concentration-attenuation and a time lag during the study period. A two-parameter, semi-empirical model was used to predict concentrations of indoor fluorescent bioaerosols of outdoor origin. The measured and predicted concentrations had a linear relationship for the studied size fractions, with an R2 for all size fractions of larger than 0.83.
