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When it comes in rush hour during on-duty and off-duty,
amount of carbon dioxide exhaust from cars and motorcycles increased.
It seriously affected the health of the traffic police.
By wearing a Whistle Mask to avoiding inhaled too much carbon dioxide,
could blow a whistle at the same time.
It would not affected traffic police to direct traffic.
Southern Taiwan University of Science and Technology
Southern Taiwan University of Scien
Jyun-Sheng,Wu Zhe-Ming,Lin You-Hong, Ling