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Table 1 Content of organic carbon (C_org), total nitrogen (N_t), ratio C:N, and pH

From: Mutual relations between PAHs derived from atmospheric deposition, enzymatic activity, and humic substances in soils of differently urbanized areas

	Year	C_org	N_t	C:N	pH
	Year	g kg⁻¹		C:N	pH
Urban area	2014	14.1a	1.1a	12.6a	6.2
	2015	14.5a	1.2a	12.5a	6.4
	2016	14.2a	1.1a	12.6a	6.5
Suburban area	2014	11.4a	1.2a	9.2a	6.1
	2015	11.5a	1.3a	9.1a	6.3
	2016	11.4a	1.2a	9.1a	6.4
Rural area	2014	16.6ab	1.7ab	9.6a	6.0
	2015	16.8ab	1.8ab	9.4a	5.7
	2016	16.7ab	1.8ab	9.2a	5.9

Means followed by the same letters do not differ significantly (p > 0.05)

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