Table 5 Shielding rate and particular matter reduction rate by measured date (%)

Park Num. Space Shielding Rate 2019-05-14 Reduction Rate 2019-05-16 Reduction Rate 2019-05-24 Reduction Rate Total Average Reduction Rate
PM1 PM2.5 PM10 PM1 PM2.5 PM10 PM1 PM2.5 PM10 PM1 PM2.5 PM10
1 97.37 18.33 31.96 20.41 22.86 10.42 6.67 12.12 4.76 6.98 17.77 15.71 11.35
2 92.49 27.66 16.9 15.49 11.11 9.30 11.63 17.65 14.71 10.00 18.81 13.64 12.37
3 98.91 18.18 10.81 11.54 6.67 18.37 11.11 13.33 24.44 31.91 12.73 17.87 18.19
4 98.95 25.71 36.92 30.77 22.50 20.69 10.53 33.57 33.33 13.04 27.26 30.31 18.11
5 99.66 12.12 17.65 16.67 13.16 9.09 8.33 10.71 12.50 15.00 12.00 13.08 13.33
6 85.48 11.77 22.97 17.86 5.88 8.77 8.06 11.76 18.60 11.36 9.80 16.78 12.43
7 98.02 34.48 38.1 40.43 5.71 1.89 7.27 23.53 14.71 9.76 21.24 18.23 19.15
Ave. 95.84 21.18 25.04 21.88 12.56 11.22 9.09 17.53 17.58 14.01 17.09 17.95 14.99
Std. 5.15 8.44 10.70 10.13 7.46 6.36 1.97 8.37 9.16 8.30 6.08 5.80 3.33