Table 2. Descriptive statistics of daily measurements of air pollutants and temperature during the study period.

Pollutants/temperature	n*	Mean	SD	Minimum	Median	Maximum
Indoor PM2.5(LD) (µg/m3)
24-h mean	119	24.6	23.2	5.3	15.3	124.5
12-h nighttime mean	119	28.3	33.8	4.5	15.2	181.1
12-h daytime mean	120	21.7	17.1	3.5	15.9	103.1
1-h nighttime maximum	119	44.7	52.1	5.5	23.8	238.9
1-h daytime maximum	120	41.5	42.2	4.6	24.3	192.9
Outdoor PM2.5(LD) (µg/m3)
24-h mean	118	22.6	12.7	3.3	20.3	73.5
12-h nighttime mean	118	21.7	16.3	1.7	16.7	92.1
12-h daytime mean	120	23.6	14.1	4.3	20.9	78.5
1-h nighttime maximum	118	34.0	23.6	2.9	29.0	136.4
1-h daytime maximum	120	38.6	22.6	5.6	35.0	110.9
Stationary-site PM2.5 (TEOM)(µg/m3)
24-h mean	136	19.1	7.8	3.5	18.1	49.9
12-h nighttime mean	141	17.2	8.5	2.6	16.7	56.4
12-h daytime mean	136	21.2	10.4	2.9	18.3	56.2
1-h nighttime maximum	141	28.5	14.8	4.9	25.6	95.8
1-h daytime maximum	136	35.8	15.8	4.9	33.7	110.8
Stationary-site NO2 (ppb)
24-h mean	141	20.6	7.7	6.5	21.1	41.0
12-h nighttime mean	141	21.8	9.7	3.3	21.1	42.6
12-h daytime mean	141	19.3	8.9	4.3	18.2	41.2
1-h nighttime maximum	141	31.6	11.9	5.0	32.0	57.0
1-h daytime maximum	141	31.5	11.9	5.0	32.0	56.0
Stationary-site temperature (°C)
1-h maximum temperature	141	12.9	3.8	4.6	12.4	23.9
1-h minimum temperature	141	5.1	3.7	-0.8	4.2	15.2
Stationary-site relative humidity (%)
24-h mean	141	61.4	15.9	28.0	60.0	93.0

SD, Standard deviation; PM_2.5, particulate matter less than 2.5 µm in diameter; PM_2.5(LD), PM_2.5 measured using the dust monitor with a laser diode; TEOM, tapered-element oscillating microbalance; NO₂, nitrogen dioxide.

* : Some data are missing due to inefficient maintenance of the monitors or power failure.