Technical Abstract: Exceedance of the US Environmental Protection Agency national ambient air quality standard for PM10 (particulate matter 10µm or smaller in diameter) within the Columbia Plateau region of the Pacific Northwest US is largely caused by wind erosion of agricultural lands managed in a winter wheat – summer fallow rotation. Land management practices, therefore, are sought that will reduce erosion and PM10 emissions during the summer fallow phase of the rotation. Horizontal soil flux and PM10 concentrations above adjacent field plots (>2 ha), with plots subject to conventional or undercutter tillage during summer fallow, were measured using creep and BSNE sediment collectors and PM10 samplers installed at various heights above the soil surface. After wheat harvest in 2004 and 2005, the plots were either disked (conventional) or undercut with wide sweeps (undercutter) the following spring and then periodically rodweeded prior to sowing wheat in late summer. High winds conducive to assessing erosion during the fallow phase occurred during six sampling periods in two years, but erosion or PM10 loss was not observed during two sampling periods due to the presence of a crust on the soil surface. For the remaining sampling periods, soil loss from conventional and undercutter tillage ranged from 3 to 40 g m-2 and 1 to 27 g m-2 while PM10 loss from conventional and undercutter tillage ranged from 0.2 to 5.0 g m-2 and 0.1 to 3.3 g m-2, respectively. Undercutter tillage resulted in a 15 to 65% reduction in soil loss and 30 to 70% reduction in PM10 loss as compared with conventional tillage. Undercutter tillage, therefore, appears to be an effective management practice to reduce dust emissions from agricultural land subject to a winter wheat – summer fallow rotation within the Columbia Plateau.