Same day | 5-day mean | 14-day mean | |||||||
IQR | OR | CI | IQR | OR | CI | IQR | OR | CI | |
Number concentrations | |||||||||
NC0.01–0.1 | 15000 | 0.94 | 0.86–1.01 | 10000 | 1.13 | 1.03–1.24 | 7700 | 1.27 | 1.13–1.43 |
NC0.1–0.5 | 1800 | 1.00 | 0.93–1.07 | 1500 | 1.08 | 1.00–1.17 | 1450 | 1.11 | 1.00–1.24 |
NC0.5–2.5 | 26 | 1.03 | 0.95–1.10 | 22 | 1.05 | 0.97–1.13 | 17 | 1.03 | 0.96–1.10 |
Mass concentrations | |||||||||
MC0.1–0.5 | 21 | 1.01 | 0.94–1.08 | 21 | 1.08 | 0.99–1.17 | 17 | 1.05 | 0.96–1.15 |
MC0.01–2.5 | 28 | 1.01 | 0.93–1.09 | 26 | 1.07 | 0.98–1.17 | 20 | 1.07 | 0.98–1.17 |
PM2.5–10 | 12 | 0.97 | 0.91–1.02 | 11 | 1.06 | 0.98–1.15 | 6.7 | 1.05 | 0.96–1.15 |
Gases | |||||||||
NO2 | 22 | 1.01 | 0.95–1.08 | 16 | 1.06 | 1.01–1.12 | 12 | 1.09 | 1.03–1.15 |
CO | 0.6 | 1.03 | 0.97–1.08 | 0.6 | 1.13 | 1.05–1.22 | 0.54 | 1.14 | 1.05–1.25 |
SO2 | 21 | 1.00 | 0.95–1.06 | 17 | 0.99 | 0.93–1.05 | 13 | 0.99 | 0.95–1.04 |
NC: number concentration of particles (numbers represent diameter of particles in µm)
MC: mass concentration of particles (numbers represent diameter of particles in µm)
PM2.5–10: particulate matter with a 2.5–10 µm aerodynamic diameter
NO2: nitrogen dioxide
CO: carbon monoxide
SO2: sulphur dioxide
#: adjusted for cubic trend, temperature, weekend, Christmas holidays, first order autocorrelation. Analysis period November 4, 1996–March 30, 1997 (147 days)