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Table 1 Summary of daily mean concentrations of coarse particulate matter (PM) and other air pollutants from January 2005 to December 2010 in Fukuoka, Japan

From: Coarse particulate matter and emergency ambulance dispatches in Fukuoka, Japan: a time-stratified case-crossover study

Pollutant

Number of days

Mean (SD)

Percentile

25

50

75

Coarse PM (μg/m3)a

2,154b

9.9 (7.3)

5.8

8.4

12.1

SPM (μg/m3)

2,191

30.3 (16.1)

19.5

26.5

37.1

PM2.5 (μg/m3)

2,162

20.3 (11.2)

12.2

17.8

25.5

PM2.5/SPM

2,154b

0.67 (0.13)

0.58

0.68

0.76

NO2 (ppb)

2,191

14.0 (6.4)

9.2

12.8

17.6

Ox (ppb)c

2,191

44.1 (15.5)

33.8

42.3

53.6

SO2 (ppb)

2,191

3.5 (1.6)

2.3

3.2

4.3

  1. NO 2 nitrogen dioxide, Ox photochemical oxidants, PM 2.5 particulate matter less than 2.5 μm in aerodynamic diameter, SD standard deviation, SO 2 sulfur dioxide, SPM suspended particulate matter
  2. aConcentrations of coarse particulate matter were defined as concentrations that were calculated by subtracting PM2.5 from SPM
  3. bOn 8 days, we observed negative concentrations of coarse particulate matter and excluded those days in the analyses
  4. cDaily maximum 8-h mean concentrations
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Environmental Health and Preventive Medicine

ISSN: 1347-4715

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