北方城市冬季室内环境空气中正负离子浓度分布特征

使用ITC201A空气负离子测量仪测定了中国北方地区冬季室内正负离子浓度水平,按照空气质量评价标准评价了室内空气质量等级,研究了室内空间的正负离子浓度日变化,讨论了正负离子浓度与室内温度湿度之间的相关关系。研究结果表明:①中国东北地区冬季室内正负离子浓度水平极低,负离子平均为浓度46.9个/cm3,正离子平均浓度为52.0个/cm3,室内空气质量等级为中度和重度污染。②室内正负离子平均浓度在中午时刻均达到全天中的峰值阶段,全天中大部分时间正离子浓度高于负离子浓度;在室内人群活动和环境因子等因素复杂的影响下,正负离子平均浓度此消彼长的发生波动变化。③研究期间室内正负离子浓度变化与空气温度和湿度间未发现显著线性相关关系,环境因子的综合作用影响着室内正负离子的浓度变化水平。

Distribution Characteristics on Urban Indoor Concentration of Atmospheric Positive and Negative Ion in Northeastern China in Winter

The indoor concentration of atmospheric positive air ion（PAI） and negative air ion（NAI） in China＇s northeastern cities during winter were determined by ITC201A negative ion monitor. The indoor air quality was evaluated according to criteria to study the daily variation of PAI and NAI as well as the relationship between PAI/NAI concentration and air temperature and hu- midity. The results show that 1 ：The concentration of NAI and PAl is 46. 9/cm3 and 52.0/cm3 , which are extremely low. The in- door air quality are in the levels of E2 and E3 ; 2 ： Indoor PAl and NAI concentration around noon reached the maximum ; besides, PAI concentration is higher than NAI for most of the day and both of them fluctuates under the comprehensive functions of human activities and environmental factors; 3 ：There are no obviously linear correlations between PAI/NAI and air temperature and humidity in the research period. Furthermore, all kinds of environmental factors have impacts on the concentration of positive and negative ions.