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anthropogenic disturbance, is considered one of the largest sources of fine particulate matter (particles having diameters smaller than 2.5 μ m, PM2.5) in the Western Hemisphere ( Gill and Gillette 1991 ). Given the complex topography of the region, plumes can be vented to 2 km AGL, transported 250 km, and cover 90 000 km 2 ( Reid et al. 1994 ). The period from October through April typically includes the largest and most frequent duststorms ( Cahill et al. 1996 ). The objective of T-REX was to study the
anthropogenic disturbance, is considered one of the largest sources of fine particulate matter (particles having diameters smaller than 2.5 μ m, PM2.5) in the Western Hemisphere ( Gill and Gillette 1991 ). Given the complex topography of the region, plumes can be vented to 2 km AGL, transported 250 km, and cover 90 000 km 2 ( Reid et al. 1994 ). The period from October through April typically includes the largest and most frequent duststorms ( Cahill et al. 1996 ). The objective of T-REX was to study the
