Table 1

Concentrations of air pollutants in Taiwan (2009)

Air pollutants	Unit	Mean	Q1	Median	Q3	Min.	Max.	Range
Carbon monoxide	ppm	0.47	0.36	0.43	0.53	0.17	1.29	1.12
Nitrogen oxides	ppb	22.06	15.17	20.42	26.55	3.64	80.71	77.07
Sulfur dioxide	ppb	4.11	2.96	3.61	4.43	1.82	11.43	9.60
Ozone	ppb	30.88	28.69	30.97	33.79	21.67	43.88	22.21
PM_2.5	μg/m³	33.10	26.74	32.37	40.37	13.79	50.30	36.51
PM₁₀	μg/m³	58.93	47.15	56.04	74.51	26.74	93.69	66.95
PM_{10−2.5 †}	μg/m³	25.87	18.97	23.82	32.68	11.57	49.70	38.13

PM, particulate matter.
†PM₁₀minus PM _2.5.