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Atmospheric Particulate Matter (PM) is considered one of the most important air pollutants in terms of its health impacts, environmental degradations and visibility. Particles size, their chemical composition and atmospheric level are important factors for determining their adverse health impacts. In this paper the main objective of this work was focus on PM 10 and its bio-accumulations (microbial load) in Makkah during Hajj seasons 2016 (1437AH). This study concluded that the concentration of respirable particles (PM 10 ) and its watersoluble ions were much higher at site 2, site 1 than that at sites 3, 4 and 5 around Haram in Makkah. The secondary aerosols in terms of their concentrations can be arranged as follows:
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Atef M. F. Mohammed (2017) studied this question.
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