ABSTRACT

PM10 and PM2.5 samples were collected using the particulates E-Sampler from congested roads in three major cities of Oman. The average PM10 concentration varied from 35.87 µg/m³ in Salalah during the monsoon season to 18.95 µg/m³ in Sohar. PM2.5 concentration ranged from 20.74 µg/m³ in Muscat to 7.20 µg/m³ in Sohar. Average concentrations of PM10 and PM2.5 in all cities were below NAAQS and WHO standards. Scanning Electron Microscopy coupled with energy dispersive spectrometer (SEM-EDS) of PM2.5 particles from all cities showed spherical like fly ash and chain like soot aggregates. These might have originated from fuel burning and vehicle emissions. Fe, O and Si are the major components present in the PM2.5 and PM10 particles while other elements are present in lower percentages. PM10 particles collected from Muscat and Salalah were irregular and chain like soot aggregates that are referred to originate from natural and anthropogenic emissions. However, PM10 collected from Sohar showed irregular shape containing aluminosilicate particles that might have initiated from natural sources.

摘要

PM10 和 PM2.5 样本是使用颗粒物 E-Sampler 从阿曼三个主要城市的拥挤道路收集的。PM10 的平均浓度从季风季节塞拉莱的 35.87 µg/m 3 到苏哈尔的 18.95 µg/m ³不等^。PM2.5 浓度范围从马斯喀特的 20.74 µg/m ³到 7.20 µg/m ³在苏哈尔。所有城市 PM10 和 PM2.5 的平均浓度均低于 NAAQS 和 WHO 标准。扫描电镜结合能谱仪（SEM-EDS）对来自所有城市的 PM2.5 颗粒物进行了扫描，显示出球状粉煤灰和链状烟尘聚集体。这些可能源于燃料燃烧和车辆排放。Fe、O 和 Si 是 PM2.5 和 PM10 颗粒中的主要成分，而其他元素的含量较低。从马斯喀特和塞拉莱收集的 PM10 颗粒是不规则的、链状的烟尘聚集体，被称为源自自然和人为排放。然而，从 Sohar 收集的 PM10 显示出不规则的形状，其中含有可能来自天然来源的硅铝酸盐颗粒。