For indoor measurements, three sampling locations
were selected in each shop house on the 1st, 2nd and 4th
floors. The measurements were taken by placing
Personal Environmental Monitor (PEM) instruments
at about 1.5 m height from the floor. The 1st floor or
ground floor normally was the shop area, whereas the
2
nd and 4th floor contained living or bed rooms. The
outdoor measurement was made by placing a PEM
outside the building on the 2nd floor balcony about 5 m
above ground level. The ambient roadside
measurement was taken at the On-Nuch station using
a High Volume PM-10 Air Sampler