Motorcyclists inhaling carcinogens behind buses, children breathing in particulates that cause respiratory and skin ailments, drivers growing drowsy from carbon monoxide ... the damage to human health is a huge invisible social cost.
跟在公車後面的機車騎士吸著致癌物質；和排氣管等高的小孩，天真無邪地承受著可能引起氣喘、皮膚過敏的因子；一氧化碳讓汽車駕駛人疲累不堪……，汽車對人們健康的消耗，是一筆龐大卻無形的社會成本。