TSP, PM 10 , and PM 2.5 emissions from a beef cattle feedlot using the flux-gradient technique

Abstract Emissions data on air pollutants from large open-lot beef cattle feedlots are limited. This research was conducted to determine emissions of total suspended particulates (TSP) and particulate matter (PM 10 and PM 2.5 ) from a commercial beef cattle feedlot in Kansas (USA). Vertical particulate concentration profiles at the feedlot were measured using gravimetric samplers, and micrometeorological parameters were monitored with eddy covariance instrumentation during the nine 4- to 5-day intensive sampling campaigns from May 2010 through September 2011. Emission fluxes were determined from the measured concentration gradients and meteorological parameters using the flux-gradient technique. PM ratios based on calculated emission fluxes were 0.28 for PM 2.5 /PM 10 , 0.12 for PM 2.5 /TSP, and 0.24 for PM 10 /TSP, indicating that a large fraction of the PM emitted at the studied feedlot was in the coarse range of aerodynamic diameter, >10 μm. Median daily emission factors were 57, 21, and 11 kg 1000-head (hd) −1  d −1 for TSP ( n  = 20 days), PM 10 ( n  = 19 days), and PM 2.5 ( n  = 11 days), respectively. Cattle pen surface moisture contents of at least 20–30% significantly reduced both TSP and PM 10 emissions, but moisture's effect on PM 2.5 emissions was not established due to difficulty in measuring PM 2.5 concentrations under low-PM conditions.