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Open-Path Transmissometry for Measurement of Visibility Impairment by Fugitive Emissions from Livestock Facilities

We are adapting the long-path visibility transmissometer (model LPV-2/3, Optec, Inc., Lowell, MI) as 
a line-integrating, surrogate measurement for agricultural particulate matter where the source of the particulate 
matter, and therefore its “extinction behavior” as a function of mass concentration, is known with confidence. 
We report herein on our introductory field work to calibrate time-averaged measurements of total atmospheric 
extinction (L-1) against time-averaged mass concentrations (M L-3) of total suspended particulate (TSP) and 
PM10 as measured using standard gravimetric methods. Both measurements are to be taken along the 
downwind boundary of a cattle feedyard, open-lot dairy or other open-lot livestock facility wherein the fugitive 
dust is predominantly derived from dried, pulverized manure suspended in air by hoof action.