Environmental Sciences Europe

Table 4 Correlation coefficients of elements and NO₂ at 20 indoor sites

From: Indoor monitoring of heavy metals and NO₂ using active monitoring by moss and Palmes diffusion tubes

	Al	Cr	Cu	Zn	Sn	Cd	Pb	Mo	Sb
Cr	0.935***
Cu	0.102	0.046
Zn	0.256	0.199	0.206
Sn	0.449*	0.566*	− 0.113	0.178
Cd	0.247	0.179	− 0.031	0.834***	0.467*
Pb	0.092	0.206	0.371	0.539*	0.547*	0.417
Mo	0.458*	0.421	− 0.349	0.227	0.549*	0.445	0.215
Sb	0.269	0.431	0.298	0.369	0.658**	0.350	0.806***	0.161
NO₂	0.054	0.122	− 0.207	0.120	-0.009	0.118	0.036	0.276	0.172

Significances given as: p < 0.001***, p < 0.01**, p < 0.05*

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