Table 2 Quartile classification of benzene levels in 649 Harris County census tracts, kriged values versus ASPEN estimates.
| Â | 1999 ASPEN Modeled Estimates | |||
|---|---|---|---|---|
1998-2000 Kriged Predicted Values | Low No. (%) | Medium-Low No. (%) | Medium-High No. (%) | High No. (%) |
Low | 91 (56.2) | 43 (26.5) | 20 (12.4) | 8 (4.9) |
Medium-Low | 11 (6.8) | 66 (40.7) | 50 (31.9) | 35 (21.5) |
Medium-High | 23 (14.2) | 14 (8.6) | 51 (31.5) | 74 (45.4) |
High | 37 (22.8) | 39 (24.1) | 41 (25.3) | 46 (28.2) |
Total | 162 (100.0) | 162 (100.0) | 162 (100.0) | 163 (100.0) |