Table 4.

Air quality index.

AQI data					0–50		51–100		101–150
Location	Average	SD	Lowest	Highest	Days	%	Days	%	Days	%
ZY	40	47	7	92	282	77.05	84	22.95	0	0
BQ	48	24	11	182	261	71.31	94	25.68	8	2.19
TC	56	30	12	200	224	61.2	117	31.97	17	4.64
XZ	54	26	13	190	223	60.93	123	33.61	15	4.1
Total Taiwan 2020	57				11,405	54.67	7,397	35.46	1,850	8.87