The street washing plan of Taichung City in 2008, the plan from 97/1/31 to 98/1/30 stops, counts for 12 months. Washes the street length statistics to 98/1/15 total execution 44,542.59 kilometers, completes the progress to reach 101.56%. According to the environmental protection bureau recognized the decrement formula computation, the street washing 44,542.59 kilometers to compute decrease TSP 614.7 metric tons and PM10 115.8 metric tons. TSP and PM10 examination work, it washes in front of the street TSP an average value is 249.2 μg/m3, after washes the street the TSP reduction rate for 31.2％; Washes in front of the street PM10 an average value is 107.2 μg/m3, after washes the street the PM10 reduction rate for 25.5％. Street dust diagnosis work: According to the analysis result demonstrated washes off the work regarding total street dust reduction rate is 50.3%, dust reduction rate is 47.2% and particle size less than 75μm reduction rate is 53%. The Project to execute 184 times the roadway census findings, non class-C , class-A at 64.6%, class-B at 35.4%.

street washing,tsp,pm10,dust,reduction rate