2.2. Sampling procedure
Particulate matter was collected using a single stage impactor type
PM0.6 sampler (standardized against Aerodynamic Particle Sizer, APS).
Flowrate of samplerwas 12 LPM which was controlled by the rotameter
(calibrated using amass flowmeter). Polytetrafluoroethylene (PTFE) or
Teflon filter papers with 47mmdiameter and 2 μmpore sizewere used