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Table 1 Nitrogen dioxide concentrations (ppb) during DNC and non-DNC weeks, stratified by a priori traffic classification.

From: The air quality impacts of road closures associated with the 2004 Democratic National Convention in Boston

Category

Median concentration and range, DNC

Median concentration and range, non-DNC 1

Median concentration ratio (DNC/non-DNC) and range

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)

  1. 1 Average of concentration the week before and after the DNC