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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

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Environmental Health

ISSN: 1476-069X