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Table I. Comparison of particulate emission Description Average particulate concentration Before the control device After the control device Particulate emissions in stack gases 3 fim or smaller larger than 3 nm Oil fired boiler (mg/m 3 ) 435a 87 67.4b 19.6 All Data From 4 Coal fired boiler (mg/m 3 ) 3070 9.2 3.2 C 6.0 a Based on 80% control efficiency. b 87 X 77.5% = 67.4 mg/m 3 (after the multicyclones). C 9.2 X 35.0% = 3.2 mg/m 3 (after the electrostatic precipitator).