Table 2.
Descriptive statistics of daily concentrations of air pollutants for 2006–2011 in Taiwan.
| Air Pollutant | Mean ± SD | Minimum | 25th Percentile (Q1) | Median (Q2) | 75th Percentile (Q3) | Maximum | Taiwan’s Ambient Standards |
|---|---|---|---|---|---|---|---|
| CO (ppb) | 561 ± 172 | 150 | 448 | 553 | 618 | 1,070 | 9000 a |
| NOX (ppb) | 19.6 ± 5.72 | 2.33 | 16.1 | 20.5 | 22.9 | 29.7 | 50 b |
| O3 (ppb) | 27.9 ± 3.85 | 20.5 | 25.9 | 27.7 | 29.9 | 41.7 | 60 a |
| PM10 (µg/m³) | 56.8 ± 14.4 | 21.7 | 47.9 | 56.7 | 65.0 | 88.1 | 65 b; 125 c |
| SO2 (ppb) | 4.81 ± 1.85 | 1.90 | 3.51 | 4.32 | 6.11 | 11.7 | 30 b; 100 c |
CO, carbon monoxide; NOX, nitrogen oxides; O3, ozone; PM10, particulate matter with aerodynamic diameter ≤ 10 μm; SO2, sulfur dioxide; SD, standard deviation. a 8-h average; b annual average; c daily average.