Table 2.

Meteorological conditions and air pollution levels in South Korea during study period (1 January 2004–31 December 2012).

	Hot Weather				Cold Weather				Warm Weather
	Mean	Range	Median	IQR	Mean	Range	Median	IQR	Mean	Range	Median	IQR
Temperature
mean	24.19 ± 2.87	10.2–32.74	24.2	4.1	0.55 ± 4.71	−18.9–18.9	0.6	6.4	13.51 ± 6.30	−8.20–29.60	14.1	9.6
maximum	28.56 ± 3.5	11.4–38.7	28.8	4.9	5.54 ± 5.03	−11.5–24.5	5.5	7	19.02 ± 6.58	−4.50–35.90	19.7	9.8
minimum	20.74 ± 3.2	0.5–29.1	21	4.5	−3.81 ± 5.16	−27.7–16.1	−3.7	6.8	8.75 ± 6.78	−17.7–27.2	9.1	10.2
Other meteorological variables
Precipitation (mm)	8.98 ± 24.18	0–449.5	0	5.0	0.93 ± 4.01	0–106	0.0	0.0	2.80 ± 10.44	0–420.0	0	0.2
Relative humidity (%)	75.59 ± 11.36	22.3–100	76.5	15.1	58.52 ± 15.75	11.3–100	58.9	22.9	63.51 ± 15.02	12.1–100	64.5	21.7
Sea-level pressure (hPa)	1007.7 ± 4.2	988.4–1021.0	1007.9	5.9	1023.6 ± 5.2	995.1–1039.5	1023.9	6.8	1016.51 ± 6.15	990.5–1034.9	1016.8	8.4
Air pollutant levels
PM10 (μg/m3)	42.39 ± 21.86	1.5–249.21	38.43	27.07	56.77 ± 28.26	0–368.77	50.31	32.85	55.76 ± 37.72	2.54–1106.04	48.46	32.88
NO2 (ppm)	0.02 ± 0.01	0–0.1	0.02	0.01	0.03 ± 0.01	0–0.1	0.03	0.02	0.02 ± 0.01	0–0.11	0.02	0.01
CO (ppm)	0.43 ± 0.16	0–2.64	0.41	0.19	0.78 ± 0.39	0–6.03	0.7	0.46	0.57 ± 0.24	0–3.32	0.52	0.26
SO2 (ppb)	4.14 ± 2.21	0–42.3	3.7	2.3	7.58 ± 4.09	0–60.1	6.7	4.2	5.22 ± 2.69	1.5–35.2	4.7	2.9
O3 (ppm)	0.03 ± 0.01	0–0.09	0.02	0.02	0.02 ± 0.01	0–0.09	0.02	0.01	0.03 ± 0.01	0–0.09	0.02	0.02

Hot Weather (summer): June–August; Cold Weather (winter): December–February; Warm Weather (spring and autumn): March–May and September–November; IQR: interquartile range.