2012 Annual Report 1a.Objectives (from AD-416): The objectives of this proposed research are to:. 1)Measure the emission rates/fluxes of particulate matter (PM), selected volatile organic compounds (VOCs), and GHGs from open-lot cattle feedlots in Kansas and. 2)Characterize the chemical nature of particulate matter emitted from commercial cattle feedlots. 1b.Approach (from AD-416): 1) Measurement of the concentration profiles of PM10 and PM2.5 in a commercial feedyard - within facility and/or downwind edge of the facility. a) Quasi-continuous – tapered element oscillating microbalance (TEOMs); and b) Time-averaged – low-volume federal reference method (FRM) samplers. 2) Measurement of the concentration profiles of greenhouse gases (i.e., CO2, N2O, CH4) and selected VOCs (i.e., phenols) - within facility and/or edge-of- facility boundaries. a) Canisters – for GHGs; and b) Sorbent tubes – for selected VOCs. 3) Meteorological tower equipped with eddy covariance instrumentation to be set up within or on the downwind edge of the facility. a) 3-D sonic anemometer; b) Open-path CO2/H2O gas analyzer; and c) Temperature profile. 4) Characterization of particulates and partitioning of VOCs from PM as a function of particle size using Raman spectroscopy. 3.Progress Report: In 2012, we completed the in-life phase of the intensive field sampling program at a large cattle feedlot operation (25,000 head) in central Kansas. The last sampling event occurred at the end of September 2011, and sample processing was completed in November 2011. The photoacoustic instrument was used in static chambers at the feedlot and in the lab until late March 2012. Laser data was collated for all sampling events 2010-2011 and all 2010 laser data was collated with corresponding micromet data. Photoacoustic infrared data (methane, ammonia, nitrous oxide, and carbon dioxide) still needs to be collated with micromet data as does the volatile organic compound (VOC) data. Estimates for completion of the data collation with micromet data is October/November 2012 for lasers (ammonia and methane), January 2013 photoacoustic data, and March 2013 for VOC data.