Table 3.

Descriptive statistics for the indoor and outdoor 5-d PM concentrations (µg/m³) and CO₂ levels (ppm). AERs (h⁻¹) and Q_p (L/sp) are also reported. n = number of classrooms or outdoor sampling sites in which airborne particles and CO₂ were monitored, AM = arithmetic mean, SD = standard deviation.

	N	AM ± SD	Median	Range		n	AM ± SD	Median	Range
PM0.5 ind					PM10 ind
SC1	8	13.2 ± 6.5	13.4	4.4–21.7	SC1	8	130.3 ± 55.8	114.4	60.2–219.8
SC2	12	9.7 ± 4.1	9.8	2.5–15.9	SC2	12	136.0 ± 77.2	128.9	40.9–282.3
Total	20	11.1 ± 5.3	10.1	2.1–21.7	Total	20	133.8 ± 67.9	127.3	40.9–282.3
PM1 ind					TSPind
SC1	8	23.7 ± 8.4	27.1	11.4–33.0	SC1	8	235.0 ± 87.3	229.0	101.3–354.9
SC2	12	16.3 ± 4.5	16.9	5.9–23.0	SC2	12	252.3 ± 129.5	243.9	100.6–504.9
Total	20	19.2 ± 7.2	17.5	5.9–33.0	Total	20	245.4 ± 112.2	235.2	100.6–504.9
PM2.5 ind					CO2 ind
SC1	20	39.0 ± 8.7	37.9	23.9–59.2	SC1	21	891 ± 174	859	567–1191
SC2	18	26.7 ± 7.1	29.6	10.7–35.5	SC2	18	870 ± 181	806	698–1370
Total	38	33.2 ± 10.0	32.7	10.7–59.2	Total	39	881 ± 175	840	567–1370
PM2.5 out					CO2 out
SC1	7	60.5 ± 26.5	66.5	23.1–106.8	SC1	7	505 ± 37	501	448–552
SC2	6	30.9 ± 11.9	31.5	12.0–48.9	SC2	4	479 ± 11	477	469–492
Total	13	46.9 ± 25.4	43.6	12.0–106.8	Total	11	496 ± 32	490	448–552
PM5 ind					AERs
SC1	8	105.5 ± 43.3	94.3	53.1–177.1	SC1	21	0.35 ± 0.14	0.37	0.10–0.60
SC2	12	103.4 ± 56.2	97.9	31.4–206.6	SC2	18	0.39 ± 0.11	0.38	0.24–0.61
Total	20	104.2 ± 50.2	97.9	31.4–206.6	Total	39	0.37 ± 0.12	0.37	0.10–0.61
Qp
SC1	21	3.0 ± 1.6	2.9	0.7–7.7
SC2	18	3.2 ± 1.0	3.0	1.8–5.6
Total	39	3.1 ± 1.4	3.0	0.7–7.7