2010 Annual Report 1a.Objectives (from AD-416) The objective of this cooperative research project is to foster a relationship between ARS and a commercial broiler farm to develop comprehensive farm management strategies for agricultural air quality, land application of litter/cake, and watershed protection, specifically to: (1) evaluate spatial and temporal variability of litter gas flux and nutrient concentrations within tunnel ventilated commercial broiler houses; (2) develop process based pollutant gas emission factors for site-specific broiler housing; (3) determine corresponding bioaerosol concentrations during flock growout; and (4) evaluate modern litter/broiler/house management practices effects on air quality within the house and subsequent environmental effects to air, water, and land. 1b.Approach (from AD-416) Work will be done in tunnel ventilated broiler houses on the cooperator farm. The houses chosen for installation of continuous emission monitoring instrumentation, the times for in-house, within flock measurements and the litter or cake sample collection are established at the farmer’s discretion with input from the researcher. The continuous measurement process uses a reduced scale semi-permanent instrument laboratory, located on the cooperator farm, to obtain gas concentrations within the houses in addition to background levels at the air entrance to the houses. Other data acquisition includes house climate data and ventilation activity. Instrumentation networks require conduit along house ceilings/walls for electrical and gas tubing lines. Data is downloaded by ARS weekly. Spatial and other during flock measurements are conducted using portable instruments. 3.Progress Report In-house measurements of litter gases and environmental conditions for emission factor development were conducted in broiler production houses using the Mobile Instrument Lab that has been onsite for 3 years. Litter was sampled for nutrient content, for producing activated carbon (cooperation with USDA-ARS Commodity Utilization Research Group) and inclusion in laboratory studies involving moisture effects on litter emissions. The ADODR is the principal scientist who monitored this project. The principal scientist has frequent contact via phone and site visits with the cooperator.