Table 1. Summary Statistics Including the Mean (μ), Standard Deviation (δ), Minimum (min), and Maximum (max) for Greenspace Metrics (GVI, NDVI, and GVI:NDVI) and Pollution Parameters (PM2.5, NO2, NO, CO, and CO2), for All Point Locations and All Buffer Zones (n = 24,694)a.
|
Buffer zone radius |
||||||
|---|---|---|---|---|---|---|
| Points | 100 m | 300 m | 500 m | 1000 m | 2000 m | |
| μ (δ) min, max | ||||||
| GVI (%) | 14.15 (9.94) | 14.27 (7.59) | 14.61 (6.00) | 14.62 (6.01) | 14.85 (4.62) | 14.86 (3.36) |
| 0.00, 51.85 | 0.00, 43.57 | 2.93, 35.56 | 2.94, 35.56 | 6.00, 28.29 | 8.64, 23.16 | |
| NDVI | 0.12 (0.07) | 0.12 (0.06) | 012 (0.05) | 0.12 (0.05) | 0.13 (0.04) | 0.13 (0.04) |
| –0.03, 0.39 | –0.01, 0.31 | 0.01, 0.25 | 0.01, 0.25 | 0.03, 0.22 | 0.06, 0.20 | |
| GVI:NDVI | 0.25 (0.17) | 0.25 (0.13) | 0.25 (0.10) | 0.25 (0.10) | 0.26 (0.07) | 0.26 (0.05) |
| 0.00, 0.87 | 0.00, 0.74 | 0.06, 0.60 | 0.06, 0.60 | 0.12, 0.47 | 0.16, 0.39 | |
| PM2.5(μg/m3) | 6.49 (2.00) | 6.48 (2.00) | 6.48 (2.01) | 6.48 (2.01) | 6.51 (2.03) | 6.54 (2.06) |
| 2.02, 18.74 | 1.96, 18.74 | 1.97, 18.74 | 1.97, 18.74 | 1.96, 18.74 | 1.96, 19.33 | |
| NO2(μg/m3) | 17.62 (15.45) | 17.75 (15.97) | 17.93 (16.35) | 17.93 (16.35) | 18.23 (17.96) | 18.38 (18.07) |
| 0.38, 252.80 | 0.38, 280.57 | 0.38, 233.50 | 0.38, 233.50 | 0.38, 286.02 | 0.38, 286.02 | |
| NO (μg/m3) | 24.56 (42.16) | 25.39 (45.09) | 26.29 (51.19) | 26.29 (51.17) | 26.77 (53.81) | 26.99 (54.04) |
| 0.16, 735.13 | 0.15, 738.90 | 0.15, 860.35 | 0.15, 860.35 | 0.15, 871.16 | 0.15, 871.16 | |
| CO (mg/m3) | 860.90 (21.30) | 808.90 (21.46) | 809.00 (21.37) | 809.00 (21.36) | 809.00 (21.41) | 809.10 (21.51) |
| 740.20, 895.30 | 746.50, 895.80 | 746.50, 892.30 | 746.50, 892.30 | 746.50, 891.20 | 740.20, 896.70 | |
| CO2(mg/m3) | 0.37 (0.05) | 0.37 (0.05) | 0.37 (0.05) | 0.37 (0.05) | 0.37 (0.05) | 0.37 (0.05) |
| 0.25, 0.58 | 0.25, 0.58 | 0.25, 0.58 | 0.25, 0.58 | 0.25, 0.58 | 0.25, 0.58 | |
a
GVI values range from 0 to 100 (%); NDVI values vary between −1 and 1; and GVI:NDVI ratios vary from 0 to 1. For all of the metrics, higher values correspond with a greater level of greenspace.