One of the most important characteristics of airborne dust is the amount of dust fallout rate deposited in the region. During the past decade, increasing awareness of the human health hazards posed by dust in Iran has spurred investigations documenting the deposition and source areas of the dust (Rashki, et al., 2012; Hojati et al., 2012), and identifying the regional atmospheric and land surface processes controlling dust transport. Also, in order to measure the dust fallout rate, similar studies have been carried out in Iran and other countries (Ta et al., 2004; O'hara et al., 2000). The objective of this study was to investigate the effect of climatological factors on airborne dust fallout rate in Khorasan Razavi Province, Northeast Iran.

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