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Ambient fine particulate matter (PM 2.5 ) samples were collected from January to December 2007 to investigate the sources and chemical speciation in Palestine, Jordan, and Israel. The 24-h PM 2.5  samples were collected on 6-day intervals at eleven urban and rural sites simultaneously. Major chemical components including metals, ions, and organic and elemental carbon were analyzed. The mass concentrations of PM 2.5  across the 11 sites varied from 20.6 to 40.3  μ g/m 3 , with an average of 28.7  μ g/m 3 . Seasonal variation of PM 2.5  concentrations was substantial, with higher average concentrations (37.3  μ g/m 3 ) in the summer (April–June) months compared to winter (October–December) months (26.0  μ g/m 3 ) due mainly to high contributions of sulfate and crustal components. PM 2.5  concentrations in the spring were greatly impacted by regional dust storms. Carbonaceous mass was the most abundant component, contributing 40% to the total PM 2.5  mass averaged across the eleven sites. Crustal components averaged 19.1% of the PM 2.5  mass and sulfate, ammonium, and nitrate accounted for 16.2%, 6.4%, and 3.7%, respectively, of the total PM 2.5  mass. The results of this study demonstrate the need to better protect the health and welfare of the residents on both sides of the Jordan River in the Middle East.

Spatial and Temporal Variation in Fine Particulate Matter Mass and Chemical Composition: The Middle East Consortium for Aerosol Research Study