Table 2.
Descriptive statistics and Spearman's correlations for air pollution and temperature (T)
| Percentile | Correlations | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| n | Mean (±SD) | 25th | 50th | 75th | Max | TRAF | BIOM | SALT | IND | PM2.5 | ABS | PNC | T | |
| LRT (µg/m3) | 130 | 4.5 (±3.4) | 1.7 | 4.3 | 6.0 | 17.4 | 0.16 | 0.56 | −0.54 | 0.07 | 0.86 | 0.60 | 0.30 | −0.11 |
| TRAF (µg/m3) | 130 | 0.6 (±0.4) | 0.3 | 0.5 | 0.7 | 1.7 | 0.19 | −0.07 | 0.14 | 0.25 | 0.44 | 0.84 | −0.41 | |
| BIOM (µg/m3) | 130 | 1.6 (±1.5) | 0.5 | 1.1 | 2.2 | 7.4 | −0.16 | 0.11 | 0.76 | 0.88 | 0.30 | −0.15 | ||
| SALT (µg/m3) | 130 | 0.1 (±0.2) | 0.01 | 0.02 | 0.06 | 1.2 | 0.21 | −0.38 | −0.22 | −0.12 | −0.02 | |||
| IND (µg/m3) | 130 | 1.0 (±1.0) | 0.3 | 0.7 | 1.4 | 6.0 | 0.27 | 0.23 | 0.27 | −0.41 | ||||
| PM2.5 (µg/m3) | 160 | 8.1 (±5.0) | 4.5 | 6.8 | 10.0 | 27.6 | 0.82 | 0.40 | −0.19 | |||||
| ABS (m−1×10−5) | 131 | 1.5 (±0.9) | 0.9 | 1.3 | 1.9 | 4.8 | 0.49 | −0.23 | ||||||
| PNC (cm−3) | 155 | 6300 (±5100) | 3100 | 4599 | 7937 | 29 332 | −0.42 | |||||||
| T (°C) | 160 | −4.3 (±6.1) | −7.6 | −2.8 | 0.3 | 7.3 | ||||||||
ABS, absorption coefficient; BIOM, biomass combustion; IND, pulp industry; LRT, regional and long-range transport; PM2.5, particles <2.5 µm in aerodynamic diameter; PNC, particle number concentration; SALT, sea salt; TRAF, traffic emissions.