2011 Annual Report 1a.Objectives (from AD-416) Measure ammonia, methane, and carbon dioxide concentration in air emitted from deep-bedded monoslope cattle facilities over a 3-year period. 1b.Approach (from AD-416) Two commercial deep-bedded monoslope cattle barns in NW Iowa will be used for this 3-year monitoring study. In each barn, instrumentation will be set up in two pens for continuous monitoring of ammonia, carbon dioxide, and methane using the 1412 INNOVA photoacoustic gas monitor (n=4 pens). Ammonia, carbon dioxide, and methane concentration of air will be measured at an inlet point on the south side of each pen. Ammonia, carbon dioxide, and methane concentrations will also be measured from air samples collected at three sampling points approximately 3 meters above the feedlot surface on the north side of each pen (n=8 locations/barn). Air samples will be monitored continuously for 1 month at the first barn. The equipment will then be moved to two pens in the second barn and the process repeated for one month. There will then be one month when no samples will be collected during which time equipment repair/maintenance will occur and the INNOVA can be used for other research projects. The 2 month monitoring cycle will be repeated during each of the four seasons for a total of 8 months of data collection per year. Scientists from South Dakota State University will use the same methodology to collect data from two additional cattle deep bedded barns. The data will be combined with ARS data and published together. 3.Progress Report ARS scientists teamed with scientists from South Dakota State University (SDSU) and Iowa State University (ISU) to monitor air emissions from four deep-bedded monoslope beef production facilities. The four facilities were instrumented for continuous measurement of gas emissions, temperature, and relative humidity. Two facilities were managed by ARS scientists and two facilities were managed by SDSU scientists. A stakeholders meeting was held to discuss initial results, methods to efficiently share data, and to plan summer educational events. Over 200 attendees participated in open houses held at the facilities in Iowa and South Dakota. ARS scientists were involved in the planning, execution and presenting of information at these educational events. The ADODR monitors the Reimbursable Agreement with routine emails, conference calls, and face-to-face meetings with the principal investigator, SDSU and ISU collaborating scientists, and grant stakeholders.