Abdel-Salam Mahmoud M M
a Department of Environmental Sciences, Faculty of Science , Alexandria University , Alexandria , Egypt.
J Air Waste Manag Assoc. 2015 Aug;65(8):930-6. doi: 10.1080/10962247.2015.1040138.
PM2.5 (particulate matter with an aerodynamic diameter <2.5 μm) samples were collected in the indoor environments of 15 urban homes and their adjacent outdoor environments in Alexandria, Egypt, during the spring time. Indoor and outdoor carbon dioxide (CO₂) levels were also measured concurrently. The results showed that indoor and outdoor PM2.5 concentrations in the 15 sites, with daily averages of 45.5 ± 11.1 and 47.3 ± 12.9 µg/m³, respectively, were significantly higher than the ambient 24-hr PM2.5 standard of 35 µg/m³ recommended by the U.S. Environmental Protection Agency (EPA). The indoor PM2.5 and CO₂levels were correlated with the corresponding outdoor levels, demonstrating that outdoor convection and infiltration could lead to direct transportation indoors. Ventilation rates were also measured in the selected residences and ranged from 1.6 to 4.5 hr⁻¹ with median value of 3.3 hr⁻¹. The indoor/outdoor (I/O) ratios of the monitored homes varied from 0.73 to 1.65 with average value of 0.99 ± 0.26 for PM2.5, whereas those for CO₂ranged from 1.13 to 1.66 with average value of 1.41 ± 0.15. Indoor sources and personal activities, including smoking and cooking, were found to significantly influence indoor levels.
在春季期间，于埃及亚历山大市的15户城市家庭的室内环境及其相邻的室外环境中采集了PM2.5（空气动力学直径小于2.5微米的颗粒物）样本。同时还测量了室内和室外的二氧化碳（CO₂）水平。结果显示，这15个地点的室内和室外PM2.5浓度分别为每日平均值45.5±11.1和47.3±12.9微克/立方米，显著高于美国环境保护局（EPA）推荐的24小时环境PM2.5标准35微克/立方米。室内PM2.5和CO₂水平与相应的室外水平相关，表明室外对流和渗透可导致污染物直接进入室内。还对选定住宅的通风率进行了测量，范围为1.6至4.5小时⁻¹，中位数为3.3小时⁻¹。受监测家庭的室内/室外（I/O）比值，PM2.5从0.73至1.65不等，平均值为0.99±0.26，而CO₂的比值范围为1.13至1.66，平均值为1.41±0.15。发现室内来源和个人活动，包括吸烟和烹饪，对室内污染物水平有显著影响。
