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Table 1 Summary statistics of weather conditions and air pollution data in Toronto from April 1 st 2002 to March 31 st 2010

From: Extreme ambient temperatures and cardiorespiratory emergency room visits: assessing risk by comorbid health conditions in a time series study

Variables Number of days of measurements Mean Standard deviation Minimum Percentiles Maximum
25th 50th 75th
Mean temperature (°C) 2922 8.7 10.7 -20.3 0.3 9.0 18.2 31.5
Mean relative humidity (%) 2922 69.3 14.4 -25.6 61.9 70.5 78.3 98.8
PM2.5 (Ug/m3) 2922 8.4 6.85 0 3.8 6.3 10.5 49.2
NO2 (Ug/m3) 2922 20.5 7.7 5.0 15.0 19.4 24.8 62.6
O3 (ppb) 2920 22.1 12.3 2.2 14.6 21.0 28.0 248.0
CO (Ug/m3) 2915 0.4 0.2 0 0.2 0.3 0.5 1.8
SO2 (Ug/m3) 2922 2.2 2.1 0 1.0 1.5 3.0 17.3
Cardiovascular admissions 2922 100.2 20.9 49.0 84.0 101.0 116.0 161.0
Respiratory admissions 2922 192.6 62.8 93.0 156.0 182.0 213.0 801.0