Table 1 |
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Nitrogen dioxide concentrations (ppb) during DNC and non-DNC weeks, stratified by a priori traffic classification. |
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| Category |
Median concentration and range, DNC |
Median concentration and range, non-DNC 1 |
Median concentration ratio (DNC/non-DNC) and range |
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| 1 – Hypothesized decrease (n = 7) |
7 (3 – 16) |
10 (6 – 20) |
0.58 (0.27 – 2.0) |
| 2 – Hypothesized increase (n = 9) |
14 (7 – 19) |
12 (3 – 15) |
1.15 (0.51 – 1.88) |
| 3 – Hypothesized no change (n = 11) |
11 (6 – 19) |
12 (7 – 17) |
0.88 (0.82 – 1.23) |
| 4 – Unclear impacts a priori (n = 7) |
7 (6 – 9) |
12 (4 – 18) |
0.70 (0.38 – 2.4) |
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1 Average of concentration the week before and after the DNC |
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Levy et al. Environmental Health: A Global Access Science Source 2006 5:16 doi:10.1186/1476-069X-5-16 |
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