The study investigated the effect of an Electronic Toll Collection (ETC) system on reducing downwind air pollution under conditions with wind speeds greater than or equal to 0.5 m/s at the Sinyin toll station, located in Tainan, Taiwan. Specifically, the study examined the changes in traffic patterns, air pollution reductions, and the Excessive Lifetime Cancer Risks (ELCR) reduction before-and-after the implementation of the ETC system. Before data were collected from 12/27/2013 to 1/2/2014 and then After data were collected from 3/3/2015 to 3/9/2015.
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