For each participating house, four types of PM-10
measurements, namely indoor air, outdoor air, personal
monitoring and ambient roadside air, were performed
simultaneously and repeatedly for 3 consecutive days
per season and only on weekdays. Measurements were
conducted in all three seasons from December 2002 to
August 2003 (winter: December to January, summer:
March to May and the rainy season: June to August).
Thus a total of nine measurements per subject/sampling
location were obtained. All samples were programmed
to be collected for 24 hrs from 10:00 a.m. of the first
day to 10:00 a.m. of the next day