Comparison between air pollution concentrations measured at the nearest monitoring station to the delivery hospital and those measured at stations nearest the residential postal code regions of pregnant women in Fukuoka

Table 3 Comparisons between pollutant concentrations measured at the Yoshizuka monitoring station and those at the nearest monitoring stations to the respective residential postal code regions

	Concentrations measured at the nearest monitoring stations to the respective residential regions			Concentrations measured at the Yoshizuka monitoring station			Percentage difference^a
	n	Mean	SD	n	Mean	SD	%
Fine particulate matter (PM_2.5) (μg/m³)
1-day average	689	17.2	9.2	690	17.0	9.1	1.0
7-day average	695	17.9	6.1	695	17.7	5.7	1.4
1-month average	695	18.2	4.0	695	18.0	3.5	1.2
3-month average	695	18.4	3.0	695	18.1	2.4	1.4
Suspended particulate matter (SPM) (μg/m³)
1-day average	682	23.0	12.0	689	21.6	11.9	6.6
7-day average	690	24.2	8.4	695	22.7	7.9	6.7
1-month average	693	24.5	5.7	695	23.1	5.0	6.0
3-month average	695	24.7	4.8	695	23.2	3.8	6.8
Coarse particulate matter (μg/m³)^b
1-day average	676	6.0	5.2	684	4.8	5.0	24.3
7-day average	690	6.3	4.3	695	5.0	3.7	25.4
1-month average	693	6.3	3.4	695	5.1	2.5	23.2
3-month average	695	6.4	3.2	695	5.1	1.8	26.1
Nitrogen dioxide (NO₂) (ppb)
1-day average	685	11.6	6.7	684	14.0	7.6	−17.6
7-day average	689	11.7	5.4	695	14.0	5.3	−16.9
1-month average	692	11.8	4.8	695	14.3	4.3	−17.5
3-month average	692	11.6	4.3	695	14.4	3.7	−19.1
Photochemical oxidants (Ox) (ppb)
1-day average	687	44.0	15.3	695	42.8	14.8	2.8
7-day average	688	44.5	11.7	695	43.4	10.9	2.5
1-month average	689	44.5	10.5	695	43.6	9.4	2.2
3-month average	693	44.3	9.1	695	43.5	7.9	1.9
Sulphur dioxide (SO₂) (ppb)
1-day average	387	2.1	1.6	654	1.9	1.4	12.9
7-day average	401	2.2	1.2	678	1.9	0.8	15.3
1-month average	408	2.3	1.1	695	2.0	0.7	14.2
3-month average	408	2.4	1.0	695	2.2	0.7	11.3

SD standard deviation
^a(Concentrations measured at the nearest monitoring stations to the respective residential regions − concentrations measured at the Yoshizuka station) ✕ 100/concentrations measured at the Yoshizuka station
^bConcentrations of coarse particulate matter were defined as the result of subtracting the PM_2.5 from the SPM concentrations

ISSN: 1347-4715