20-11 URBAN ECOLOGICAL NATURAL ENVIRONMENT(2002-2007) |  |  |
Item | 2002 | 2003 | 2004 | 2005 | 2006 | 2007
Parks,Gardens and Green Areas |  |  |  |  |  |  |
Parkes,Gardens and Green Areas (hectare) |  | 4779 | 4813 | 5213 | 5529 | 4037 | 6057
Green Space of Park (hectare) |  | 1101 | 1193 | 1433 | 1568 | 1333 | 1389
Green Space in Constucted Areas (hectare) |  | 2973 | 3239 | 3700 | 4047 | 4368 | 4680
Rate of Green Space in Constructed Areas (%) |  | 32.9 | 35.1 | 37.6 | 38.8 | 40.6 | 41.6
Per Capita Green Area of Park (sq.m) |  | 5.23 | 5.59 | 6.60 | 7.10 | 8.60 | 11.35
Urban Parks (park) |  | 17 | 18 | 18 | 18 | 19 | 21
Park Area (hectare) |  | 174 | 236 | 337 | 387 | 328 | 458
Water, Air and Noise |  |  |  |  |  |  |
Rate up to the Standards of Water Quality for Urban Potable Water Sources (%) |  |  | 99.7 | 99.7 | 100.0 | 99.8 | 100.0
Proportion of Days with Air Pollution Index less than 100 to Whole Year (%) |  |  | 81.1 | 82.5 | 84.3 | 88.8 | 85.2
Average Value of Noise in Whole Area (dB) |  |  | 53.7 | 53.6 | 54.1 | 55.0 | 55.0
Average Value of Noise Along Main Traffic Artery (dB) |  |  | 67.9 | 67.6 | 67.9 | 67.1 | 66.8
Harmless Disposal of Household Garbage and Excrement |  |  |  |  |  |  |
Refuse Discharge Quantity (10000 ton) |  | 32.01 | 45.60 | 45.80 | 45.60 | 31.80 | 43.50
Volume of Garbage Disposal (10000 ton) |  | 26.54 | 40.20 | 41.60 | 42.00 | 31.80 | 43.48
Rate of Harmless Disposal of Household Garbage (%) |  | 82.9 | 88.2 | 90.8 | 92.1 | 100.0 | 100.0
Rate of Harmless Disposal of Excrement and Urine (%) |  | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0