文章基本信息

标题：CHEMICAL COMPOSITION OF WET PRECIPITATION OF AIR POLLUTANTS: A CASE STUDY IN KARACHI,
本地全文：下载
作者：Muhammad Nasiruddin Khan ; Anila Sarwar
期刊名称：ATMOSFERA
印刷版ISSN：2395-8812
出版年度：2013
卷号：27
期号：1
语种：English
出版社：Centro de Ciencias de la Atmósfera
摘要：Air pollution has been considered one of the most important environmental challenges because of its direct effect on ecosystems and human health. Temporal changes in the composition of 20 samples of rainwater in the arid region of Karachi, Pakistan during the southwest monsoon of 2009 have been monitored to carry out the indirect assessment of air quality. The study has been fulfilled with the aim of identifying the level of air pollution, and the relative contribution of possible anthropogenic activities. Metal ions were analyzed to predict health risks. Rain samples were found to be alkaline (pH 5.55-7.55) due to the influence of calcium and magnesium rich particles. Continuous rains in consecutive days showed a remarkable decline in air pollution while the dry season boosted up the level of pollution. Strong correlations of total dissolved solids with K + , Na + , Ca 2+ , Mg 2+ , and Cl - were observed. A relatively weak correlation of total suspended particles with metals showed the possibility of some other particulate matters being suspended in the air. Principal component analysis and analysis of means were used to predict the anthropogenic source of pollution. This study will be helpful to formulate strategic planning and policies for controlling the level of air pollution in the city.
关键词：Karachi, air pollution. rainwater, chemical composition, multivariate analysis