The report gives results of a special test program to determine mass emissions of particulate, SO2, and NOx from a large utility baghouse controlling emissions from a boiler firing low-sulfur Western coal. The tests verified that NOx emissions, measured by EPA Method 7, were not significantly affected by the baghouse. Emissions of SO2 measured consistently below the New Source Performance Standard of 1.2 lb/million Btu at a level of about 0.8 lb/million Btu. Particulate tests indicated an average emission rate of 0.028 lb/million Btu. Overall test results indicate that Southwestern's Harrington Station, using low-sulfur and low-ash Western coal, can operate consistently within all applicable mass emission rates while using a fabric filter for air quality control.