Air pollution in the semitropical Saudi urban area

This paper presents the outcome of research conducted in the city of Jeddah, Saudi Arabia. Analysis of recorded meteorological elements shows that the atmosphere of the area favors the accumulation of air pollutants. Dustfall rates were measured at 22 stations in different districts. High rates of dustfall were found in all districts, with maximum recorded values in central urban and industrial districts. Collected samples were analyzed to determine the causes of these excessive precipitations. Suspended particulate matter and other pollutants were found to exceed air quality standards set to meet environmental requirements. Carbon monoxide was found to exceed the air quality standard of 9 μL/L. Concentrations of photochemical oxidants indicated the possibility of Los Angeles-type photochemical smog formation. Geographic distribution of pollutant concentrations and chemical constituents of particulates were found to be influenced by both manmade and natural causes. Results are discussed and several conclusions are given.