(1) Dindaeng station: a roadside area.
Samples were collected at the top of PCD air quality
monitoring station (3 meters above ground) at the
roadside of an eight-lane Asok-dindaeng road. The
station is located in Dindaeng housing community
area. This station was classified as roadside with
heavy traffic densities of more than 100,000 cars/12-hr
period (7.00AM-7.00PM) (Office of the Commission
for the Management of Road Traffic, 2000)