Daily and closed condition tests were conducted in 11 residences during the winter of 2016 in Xi'an.The results showed that the small particles (diameter ＜ 2.5 μm) were main particles in the house,and the number concentrations whose diameter below 2.5 μm or above 2.5 μm was the largest in the kitchen and living room,respectively.And the personnel activities had greatest influence on the particles with diameter above 2.5 μm.Under the daily conditions,the values of I/O whose diameter less than 0.5 μm or more than 8 μm were larger than 1,while the values of I/O whose diameter between O.5 μm and 8 μm were less than 1.According to the increase of particle size,the values of L/O remained stable at first,and then showed a download trend and went up afterwards;the lowest value appeared at 2.5 ～ 5.0 μm.Besides,the infiltration factor decreased firstly and then increased and went down according to the increase of particle size,maximum value appeared around 0.5 ～ 1.0 μm.In the closed conditions,the values of I/O were less than 1 when diameter were less than 8.0 μm,while they were more than 1 when diameters were greater than 8.0 μm.The values of I/O declined firstly and then rised with the increase of the particle size and it achieved the minimum value between 0.5 μm and 2.5 μm,Moreover the infiltration factor increased firstly and then decreased with the increase of the particle size,and the maximum value appeared at 0.3 μm.%于2016年冬季对西安市11户住宅进行日常和密闭工况测试.结果表明:住宅室内主要以细颗粒(直径＜2.5μm)为主,＜2.5μm和＞2.5 μm的粒子分别为厨房和客厅最多,人员活动对直径2.5 μm以上的粒子影响最大;日常工况下,直径＜0.5 μm和＞8 μm的粒子I/O值(室内、室外的颗粒物浓度之比)＞1,直径在0.5 ～8.0μm的粒子I/O值＜1,且随粒径的增大先稳定后减小再增大,2.5 ～5.0 μm范围内取得最低值,数量渗透系数Fc随粒径的增大先减小后增大再减小,0.5 ～1.0μm范围内取得最大值;密闭工况下,粒径＞8 μm时I/O值均＜1,而＞8μm时I/O＞1,且随粒径的增大先减小后增大,0.5～2.5 μm范围内取得最小值,渗透系数Fc随粒径的增大先增大再减小,直径0.3 μm处取得最大值.
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