Correlation between the arsenic concentrations in the air and the SMR of lung cancer

Table 3 Average concentrations of hazardous air pollutants and a summary of the municipal tobacco tax income per adult in measured municipalities comprising each percentile group

	PTG 1–10 (< 0.77)	PTG 11–20 (0.77–0.90)	PTG 21–30 (0.90–1.04)	PTG 31–40 (1.04–1.20)	PTG 41–50 (1.20–1.36)	PTG 51–60 (1.36–1.60)	PTG 61–70 (1.60–1.77)	PTG 71–80 (1.77–2.20)	PTG 81–90 (2.20–2.70)	PTG 91–100 (≥2.70)
Arsenic concentrations
Mean (ng/m³)	0.61	0.85	0.97	1.11	1.27	1.48	1.69	1.96	2.40	4.69
SD (ng/m³)	0.12	0.03	0.03	0.05	0.05	0.07	0.06	0.13	0.14	4.25
Number of MMs	27	26	26	27	26	26	26	27	26	27
SO₂concentrations
Mean (ppm)	0.0037	0.0039	0.0037	0.0037	0.0041	0.0037	0.0040	0.0049	0.0044	0.0050
SD (ppm)	0.0015	0.0016	0.0017	0.0013	0.0013	0.0014	0.0015	0.0014	0.0012	0.0023
Number of MMs	18	21	21	26	24	25	23	24	25	26
NO₂ concentrations
Mean (ppm)	0.015	0.017	0.016	0.015	0.018	0.020	0.017	0.019	0.015	0.016
SD (ppm)	0.006	0.007	0.007	0.007	0.005	0.012	0.007	0.007	0.004	0.006
Number of MMs	19	23	21	24	24	25	24	25	24	25
SPM concentrations
Mean (mg/m³)	0.024	0.027	0.027	0.026	0.029	0.029	0.030	0.031	0.029	0.029
SD (mg/m³)	0.007	0.007	0.007	0.007	0.006	0.007	0.006	0.006	0.003	0.006
Number of MMs	19	22	22	26	25	25	24	25	24	26
Municipal tobacco tax income
Mean (yen/adult)	8,352	9,708	8,708	8,523	8,747	7,847	8,189	9,058	8,798	8,232
SD (yen/adult)	1,867	6,369	1,317	1,074	1,776	1,373	1,385	2,406	1,510	1,625
Number of MMs	27	26	25	27	26	26	26	27	26	27

MMs, Municipalities for which arsenic concentrations were measured; SD, standard deviation; PTG, percentile group. The range is given in ten-percentile groups. The numbers in parenthesis with each PTG indicate the range in arsenic concentrations (ng/m³). There was no significant difference for NO₂ concentrations between the ten PTGs by the Kruskal–Wallis test. There was a significant difference in the SO₂ and SPM concentrations by the Kruskal–Wallis test, but no significant difference for either SO₂ or SPM was observed between the individual PTGs by the Scheffe test. And no significant difference was observed between the ten PTGs concerning the municipal tobacco tax income by the Kruskal–Wallis test

ISSN: 1347-4715