Table 2.

Descriptive Statistics of Air Pollutants, Temperature, and Humidity During Study Period

Measure	No.a	Minimum	Maximum	Mean	SD	IQR	Quartiles 25%–75%
O3, μg/m3	408	17.99	254.10	76.82	36.81	45.62	52.15–97.67
CO, ppm	408	0.65	6.09	1.78	0.95	0.81	1.18–1.99
NO2, μg/m3	408	46.02	217.23	103.02	35.56	44.43	75.97–120.40
SO2, μg/m3	408	2.67	25.11	9.90	4.07	5.50	6.66–12.10
PM10, μg/m3	408	15.93	99.08	42.03	18.63	22.33	28.27–50.06
Temperature, °C	408	4.30	21.84	16.08	3.42	4.87	14.00–18.87
Humidity, %	408	53.79	98.02	77.04	8.92	11.96	70.72–82.68

CO = carbon monoxide; NO₂ = nitrogen dioxide; O₃ = ozone; PM₁₀ = particulate matter < 10 μm in diameter; ppm = parts per million; SO₂ = sulfur dioxide. See Table 1 legend for expansion of other abbreviation.

^aNumber of observations.