Environmental Group, Materials and Energy Research Center, P. O. Box 14155-4777, Tehran, Iran.
Environ Monit Assess. 2010 Oct;169(1-4):501-7. doi: 10.1007/s10661-009-1192-2. Epub 2009 Oct 30.
Tehran, the capital city of Iran, is an important industrial and commercial center. This city is one of the worst cities in the world in terms of air pollution, which is mostly due to mobile sources rather than stationary sources. Particulate matter (PM), which is a complex mixture of extremely small particles and liquid droplets, is considered as an important source of air pollution in Tehran. In this study, our objective was to study PM(10), PM(2.5), and PM(1.0) mass and number concentrations and find the correlations of these two parameters in the west-central parts of Tehran during two consecutive warm and cold seasons. The particles collected from five stations were analyzed for their mass and number simultaneously by a laser-based Grimm dust monitor. In general, it was found that the accumulation of the PM in this region is more in the cold season. PM(10) mass concentration increases almost twofold and PM(2.5) and PM(1.0) almost three times in this season. The mean number concentration of the particles (0.3-20 microm) was found to be almost 4.8 times in the cold season. It was also noticed that the average dimensions of the particles decrease in that season.
德黑兰，伊朗的首都，是一个重要的工业和商业中心。这座城市是世界上空气污染最严重的城市之一，主要原因是移动源而不是固定源。颗粒物（PM）是一种极其微小的颗粒和液滴的复杂混合物，被认为是德黑兰空气污染的一个重要来源。在这项研究中，我们的目的是研究德黑兰中西部地区两个连续的温暖和寒冷季节中 PM(10)、PM(2.5) 和 PM(1.0)的质量和数量浓度，并找到这两个参数之间的相关性。从五个站点收集的颗粒通过基于激光的 Grimm 粉尘监测仪同时进行质量和数量分析。总的来说，发现该地区的 PM 积累在寒冷季节更多。在这个季节，PM(10)的质量浓度增加了近两倍，PM(2.5)和 PM(1.0)增加了近三倍。（0.3-20 微米）的颗粒数浓度平均值在寒冷季节几乎增加了 4.8 倍。还注意到，在那个季节，颗粒的平均尺寸减小。
