Table A2.

Descriptive statistic summary of low-cost sensor and governmental BAM (before calibration).

	Raw(a)	Raw(b)	Raw(c)	BAM
No. of samples	36911.00	36911.00	36911.00	36911.00
Mean	38.15	33.89	38.07	23.10
STD	31.29	26.52	31.32	14.84
Min	0.00	0.00	0.00	0.00
25%	16.53	15.07	16.71	13.00
50%	28.95	26.26	28.94	20.00
75%	49.60	45.31	49.39	28.00
Max	215.42	179.73	225.46	115.00