Table 1.
Average concentrations in µg/m3 and descriptive statistical analyses of nitrogen and sulfur dioxides in air at different city sites in the period 21st Feb. 2005 to 20th Feb. 2006
| Sampling no. | Time period | Nitrogen dioxide | Sulfur dioxide | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Background area | Industrial area | Traffic area | Commercial area | Residential area | Background area | Industrial area | Traffic area | Commercial area | Residential area | ||
| 1 | 21/2–7/3 | 5.81 | 44.12 | 54.28 | 31.05 | 44.90 | 3.40 | 5.83 | 8.62 | 4.93 | 4.03 |
| 2 | 7/3– 1/3 | 5.60 | 39.70 | 42.10 | 26.00 | 30.70 | 2.80 | 6.40 | 7.60 | 6.10 | 4.00 |
| 3 | 21/3–4/4 | 5.20 | 35.20 | 40.10 | 25.30 | 30.30 | 2.70 | 5.50 | 6.40 | 5.30 | 3.80 |
| 4 | 4/4–18/4 | 5.35 | 35.72 | 45.66 | 31.23 | 31.55 | 4.24 | 4.63 | 5.78 | 6.01 | 3.47 |
| 5 | 18/4–2/5 | 5.21 | 39.05 | 57.27 | 26.03 | 38.68 | 5.58 | 12.78 | 12.36 | 11.86 | 14.53 |
| 6 | 2/5–16/5 | 6.16 | 9.18 | 60.15 | 34.12 | 27.75 | 3.95 | 8.43 | 14.83 | 7.64 | 5.88 |
| 7 | 16/5–30/5 | 7.03 | 55.44 | 80.90 | 51.38 | 52.32 | 8.74 | 15.17 | 18.53 | 11.87 | 10.36 |
| 8 | 30/5–13/6 | <1.00 | 35.27 | 47.10 | 32.34 | 31.64 | 9.32 | 8.42 | 17.25 | 11.12 | 10.30 |
| 9 | 13/6–27/6 | <1.00 | 52.71 | 72.22 | 38.91 | 31.40 | 13.07 | 17.20 | 22.02 | 14.45 | 26.32 |
| 10 | 27/6–11/7 | 2.93 | 42.88 | 63.07 | 29.79 | 30.58 | 12.34 | 11.90 | 15.90 | 13.29 | 13.38 |
| 11 | 11/7–25/7 | <1.00 | 44.77 | 63.23 | 35.81 | 34.69 | 2.54 | 12.35 | 14.02 | 13.08 | 10.90 |
| 12 | 25/7–8/8 | <1.00 | 48.91 | 61.98 | 42.42 | 35.40 | 3.54 | 16.99 | 10.79 | 17.78 | 12.12 |
| 13 | 8/8–22/8 | 5.74 | 40.65 | 51.80 | 36.03 | 26.46 | 25.27 | 30.55 | 35.08 | 29.70 | 30.08 |
| 14 | 22/8–5/9 | <1.00 | 46.25 | 64.59 | 42.26 | 38.81 | 5.45 | 12.09 | 14.47 | 13.18 | 11.89 |
| 15 | 5/9–19/9 | <1.00 | 43.84 | 44.30 | 31.94 | 34.91 | 3.98 | 10.44 | 12.56 | 11.41 | 10.18 |
| 16 | 19/9–3/10 | <1.00 | 51.68 | 79.09 | 45.13 | 40.73 | 5.59 | 11.65 | 15.88 | 11.73 | 9.57 |
| 17 | 3/10–17/10 | 5.64 | 47.16 | 56.98 | 35.20 | 33.40 | 5.43 | 7.44 | 10.49 | 10.42 | 6.32 |
| 18 | 17/10–31/10 | 3.28 | 37.04 | 47.75 | 35.84 | 47.86 | 7.83 | 11.52 | 13.16 | 11.87 | 9.29 |
| 19 | 31/10–14/11 | 3.47 | 54.94 | 82.47 | 44.76 | 50.66 | 2.59 | 9.15 | 7.94 | 5.44 | 3.45 |
| 20 | 14/11–28/11 | 9.62 | 40.86 | 43.27 | 38.46 | 34.85 | 7.20 | 7.90 | 9.10 | 7.50 | 5.40 |
| 21 | 28/11–12/12 | 7.81 | 57.69 | 76.32 | 50.48 | 43.27 | 7.50 | 9.10 | 12.30 | 6.80 | 6.10 |
| 22 | 12/12–26/12 | 5.70 | 51.20 | 71.10 | 44.40 | 41.30 | 6.90 | 8.50 | 10.70 | 6.60 | 6.00 |
| 23 | 26/12–9/1 | 4.74 | 45.12 | 65.16 | 35.54 | 40.28 | 6.18 | 7.63 | 8.94 | 6.58 | 5.92 |
| 24 | 9/1–23/1 | 5.20 | 49.80 | 71.56 | 39.21 | 44.11 | 5.52 | 6.84 | 8.02 | 5.92 | 5.39 |
| 25 | 23/1–6/2 | 5.69 | 58.33 | 75.09 | 41.17 | 46.37 | 5.13 | 5.66 | 5.52 | 5.52 | 4.21 |
| 26 | 6/2–20/2 | 5.53 | 50.26 | 59.11 | 31.16 | 43.22 | 4.14 | 4.30 | 8.93 | 3.98 | 6.33 |
| Mean | 2.96 | 42.07 | 59.26 | 35.73 | 35.50 | 5.92 | 12.39 | 15.15 | 12.33 | 11.82 | |
| Median | 2.93 | 43.84 | 60.15 | 34.12 | 34.69 | 3.95 | 11.90 | 14.47 | 11.86 | 10.36 | |
| SD | 1.52 | 7.01 | 12.88 | 6.95 | 7.17 | 4.71 | 3.62 | 3.70 | 3.32 | 5.02 | |
| Minimum | <1.00 | 9.18 | 43.25 | 26.03 | 26.46 | <1.00 | 4.63 | 5.78 | 4.93 | 3.47 | |
| Maximum | 7.03 | 55.44 | 80.90 | 51.38 | 52.32 | 25.27 | 30.55 | 35.08 | 29.70 | 30.08 | |
26 batches, 14 days each, of measurements were done