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Table 1 Distribution of ASPEN and kriged values of benzene levels in 649 Harris County census tracts.

From: Kriged and modeled ambient air levels of benzene in an urban environment: an exposure assessment study

Percentile 1999 ASPEN Modeled Estimate (ppbV) 1998-2000 Kriged Predicted Value (ppbV)
Maximum 2.83 0.89
99% 1.78 0.88
95% 1.35 0.87
90% 1.09 0.85
75% 0.84 0.81
50% 0.62 0.74
25% 0.51 0.68
10% 0.44 0.64
5% 0.40 0.62
1% 0.34 0.60
Minimum 0.26 0.58