We have also adopted the data from Tsai et al.
(2004) for PAHs concentrations measured at highway
toll station to account for the traffic pollution sources in
that they collected 48, 35, and 33 personal PAH samples
from booth attendants of the dayshift (08:00 AM–
16:00 PM), nightshift (16:00 PM–00:00 AM), and latenight
(00:00 AM–08:00 AM), respectively. Their study
showed the average recovery efficiency of PAHs was
85%. The limit of detections of the 21 PAH compounds
were determined based on the analysis of serial dilutions
of PAH standards