TABLE 3.

Characteristics of daily air pollutants and meteorological variables in Xiamen from 2016 to 2019.

	Mini	Max	Average	Q1	Q2	Q3	IQR
O3-8 h (μg/m3)	12	178	81	60	79	99	39
CO (mg/m3)	0.2	1.6	0.6	0.5	0.6	0.7	0.2
SO2 (μg/m3)	2	35	9	6	8	11	5
NO2 (μg/m3)	6	121	29	19	26	36	17
PM2.5 (μg/m3)	0.006	97.000	12.057	0.024	0.110	22.000	21.976
PM10 (μg/m3)	10	141	44	30	41	56	26
Temp (°C)	3.9	32.2	21.6	16.5	22.1	27.2	10.7
Rain (mm)	0	172.7	4.1	0	0	0.9	0.9
Wind (m/s)	0.6	9.6	2.7	2.0	2.5	3.2	1.2
Humi (%)	27	99	77.43	69	79	87	18

IQR, Interquartile range.

IQR = Q3 - Q1.