Two manure handling systems are currently being tested to determine which system best eliminates all manure contamination from the air in an air qaulity laboratory. Two systems inlcude a washing gutter and a inclined conveyor belt. Both systems can beadjusted to run at various frequencies and are currently being tested to find out how often they need to run to eliminate contamination from the manure. Once the manure handling systems have been optimized to produce minimum contaimination from the manure further testing will be done on other sources of contaminants.