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| Year | Months Present |
Minimum | Median | Mean | 90th Percentile |
Maximum | Standard Deviation |
Number of Observations |
Detection Limit |
Estimated Risk |
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| 2002 |
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0.3 | 3.1 | 3.50 | 6.3 | 18 | 2.28 | 477 | 0.1 | 26 | ||||||||||||
| 2001 |
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0.05 | 2.4 | 3.18 | 5.6 | 26 | 2.85 | 491 | 0.1 | 23 | ||||||||||||
| 2000 |
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0.2 | 2.2 | 2.55 | 4.8 | 7.9 | 1.48 | 491 | 0.1 | 19 | ||||||||||||
| 1999 |
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0.05 | 2.7 | 3.20 | 6.0 | 13 | 2.12 | 584 | 0.1 | 24 | ||||||||||||
| 1998 |
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0.05 | 2.2 | 2.64 | 5.5 | 10 | 1.78 | 601 | 0.1 | 19 | ||||||||||||
| 1997 |
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0.05 | 2.5 | 2.89 | 5.1 | 12 | 1.65 | 559 | 0.1 | 21 | ||||||||||||
| 1996 |
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0.05 | 2.8 | 3.38 | 6.4 | 22 | 2.32 | 610 | 0.1 | 25 | ||||||||||||
| 1995 |
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0.05 | 2.1 | 2.93 | 5.2 | 58 | 4.81 | 608 | 0.1 | 22 | ||||||||||||
| 1994 |
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0.2 | 1.9 | 2.18 | 3.5 | 12 | 1.30 | 607 | 0.1 | 16 | ||||||||||||
| 1993 |
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0.05 | 1.8 | 2.08 | 3.8 | 7.7 | 1.35 | 590 | 0.1 | 15 | ||||||||||||
| 1992 |
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0.05 | 1.4 | 1.65 | 3.2 | 7.6 | 1.21 | 522 | 0.1 | 12 | ||||||||||||
| 1991 |
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0.05 | 1.7 | 2.07 | 4.0 | 20 | 1.58 | 569 | 0.1 | 15 | ||||||||||||
| 1990 |
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0.05 | 1.7 | 2.18 | 4.2 | 11 | 1.71 | 586 | 0.1 | 16 | ||||||||||||
| 1989 |
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0.2 | 3.1 | 3.61 | 7.2 | 24 | 2.65 | 595 | 0.1 | 27 | ||||||||||||
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| 1989-1995 data and 1996-2002 data represent different methods and should not be compared. | |||
| See Report on a Parallel Carbonyl Monitoring Study Using C18 and Silica Gel Sampling Media for details. | |||
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Notes: | Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. Risks shown only for those substances with unit risk factors. |
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