Table 2.

Spearman correlation coefficients describing the relationship between PM_2.5 mass and PNCs for the first pre-intervention sampling visit

		Particle number concentration (particles/cm3)
	indoor PM2.5	0.3–0.49	0.5–0.99	1.0–2.49	2.5–4.99	5.0–9.99	10.0+
indoor PM2.5	1.00
PNC 0.3–0.49	0.94	1.00
PNC 0.5–0.99	0.93	0.94	1.00
PNC 1.0–2.49	0.67	0.56	0.67	1.00
PNC 2.5–4.99	0.46	0.35	0.45	0.86	1.00
PNC 5.0–9.99	0.35	0.26	0.35	0.67	0.84	1.00
PNC 10.0+	0.34	0.23	0.31	0.59	0.76	0.89	1.00