我国6个典型城市住宅室内NO_(2)的污染特征

Pollution characteristics of residential indoor nitrogen dioxide in six typical cities of China

目的了解我国6个典型城市住宅室内NO_(2)的分布特征,为室内环境空气质量标准的制定及污染防控提供数据支持。方法于2018年暖季(7—8月)和冷季(12—次年2月)对我国6个典型城市281户家庭的客厅和卧室空气中的NO_(2)进行检测。采样布点方法参照《室内空气质量标准》(GB/T 18883-2002),检测采用改进的Saltzman法。结果2018年我国6个城市281户家庭室内和室外空气中NO_(2)的质量浓度M(P_(25),P_(75))分别为0.026(0.014,0.040)和0.040(0.030,0.059)mg/m^(3)。两独立样本非参数检验结果显示室外NO_(2)质量浓度中位数高于室内(z=8.76,P<0.05),暖季的室内NO_(2)质量浓度低于冷季(z=-4.95,P<0.05)。结论我国6个典型城市住宅室内和室外NO_(2)分布特征存在差异,室内NO_(2)分布具有季节差异。因此,相关部门应开展更深入的科学研究并采取严格控制的措施,加强人群健康防护,控制住宅室内NO_(2)污染。

Objective To investigate the distribution characteristics of residential indoor nitrogen dioxide(NO_(2))in six typical cities of China,and to provide data support for the development of indoor environmental air quality standards and pollution prevention and control.Methods In 2018,NO_(2) was measured in the living room and bedroom of 281 households in six typical cities of China during the warm season(July to August)and the cold season(December to February in the next year).The sampling method was based on the Indoor Air Quality Standard(GB/T 18883-2002),and the modified Saltzman method was used for measurement.Results In 2018,the median(P_(25),P_(75))mass concentrations were 0.026(0.014,0.040)mg/m^(3) for residential indoor NO_(2) and 0.040(0.030,0.059)mg/m^(3) for outdoor NO_(2) in 281 households in the six cities of China.The two independent samples non-parametric test showed that the median mass concentration of outdoor NO_(2) was significantly higher than that of indoor NO_(2)(z=8.76,P<0.05),and the mass concentration of indoor NO_(2) was significantly lower in the warm season than that in the cold season(z=-4.95,P<0.05).Conclusion There are differences in the distribution of residential indoor and outdoor NO_(2) in the six typical cities of China,and indoor NO_(2) distribution shows seasonal variation.Therefore,related departments should carry out extensive scientific research and take strict control measures to strengthen population health protection and control residential indoor NO_(2) pollution.