Table 1

Summary of meteorological factors and daily mean concentrations of air pollutants from January 2005 to December 2010 in Fukuoka, Japan

PollutantsNumber of daysMean (SD)MinIQRMaxNumber of days over air quality standards of PM2.5 (%)
Japan (35 μg/m3)WHO (25 μg/m3)
PM2.5 (μg/m3)216220.3 (11.2)2.913.383.0211 (9.8)670 (31.0)
NO2 (ppb)219114.0 (6.4)1.98.440.2
Ox (ppb)*219144.1 (15.5)2.719.877.0
SO2 (ppb)21913.5 (1.6)0.72.012.8
Temperature (°C)219117.4 (7.9)0.713.831.8
Relative humidity (%)219165.0 (11.1)26.615.594.3
  • *Daily maximum 8 h mean concentrations.

  • NO2, nitrogen dioxide; Ox, photochemical oxidants; PM2.5, fine particulate matter; SO2, sulfur dioxide.