Characteristics and 24 h concentrations levels (µg/m3) of pollutants and meteorological data during the study period 2003–2009 in the Reykjavik area
| NO2 | PM10 | SO2 | H2S | O3 | Temperature (°C) | RH (%) | |
|---|---|---|---|---|---|---|---|
| 24-h availability n (%) | 2374 (92.8) | 2492 (97.5) | 1939 (75.8) | 1250 (48.9) | 2327 (91.7) | 2150 (84.1) | 2150 (84.1) |
| Mean±SD | 22.08±13.85 | 22.22±20.13 | 1.81±1.67 | 3.35±6.69 | 40.65±13.85 | 5.90±5.20 | 77.81±10.80 |
| Winter* mean±SD | 25.41±15.31 | 25.58±23.53 | 1.73±1.72 | 4.45±8.17 | 42.17±14.93 | 2.65±3.92 | 79.13±11.33 |
| Summer† mean±SD | 17.17±9.46 | 17.53±12.68 | 1.66±1.66 | 1.60±2.29 | 38.31±11.63 | 10.43±2.85 | 76.10±9.89 |
| Range | 1.5–111.6 | 3.3–261.6 | 0–11 | 0–92 | 1.2–91.5 | −11–21 | 39–100 |
| IQR | 16.68 | 13.40 | 1.90 | 2.60 | 19.50 | 8.00 | 16.00 |
| Median | 19.2 | 16.2 | 1.3 | 1.4 | 40.4 | 6.0 | 79.0 |
| 5th centile | 5.9 | 7.2 | 0.2 | 0.2 | 18.7 | −3.0 | 59.0 |
| 25th centile | 11.9 | 11.6 | 0.6 | 0.6 | 30.7 | 2.0 | 70.0 |
| 75th centile | 28.6 | 25.0 | 2.5 | 3.2 | 50.2 | 10.0 | 86.0 |
| 95th centile | 49.6 | 55.6 | 5.2 | 12.9 | 63.9 | 13.0 | 93.0 |
| Spearman’s correlation | |||||||
| NO2 | 1.00 | ||||||
| PM10 | 0.19 | 1.00 | |||||
| SO2 | 0.53 | 0.13 | 1.00 | ||||
| H2S | 0.37 | −0.02 | 0. 23 | 1.00 | |||
| O3 | −0.53 | 0.12 | −0.37 | −0.30 | 1.00 | ||
| Temperature (°C) | −0.42 | −0.26 | −0.09 | −0.29 | −0.06 | 1.00 | |
| Relative humidity (%) | 0.06 | −0.35 | 0.00 | 0.13 | −0.06 | 0.07 | 1.00 |
*Winter months of 1 November–30 April.
†Summer months of 1 May–31 October.
H2S, hydrogen sulfide; NO2, nitrogen dioxide; O3, ozone; PM10, particulate matter ≤10 µm in aerodynamic diameter; RH, relative humidity; SO2, sulfur dioxide.