选择步行、骑自行车这两种最基本出行方式,既符合城市绿色出行的理念,更是一种增加体力活动、增强体质健康的捷径.然而,推崇机动效率的城市发展理念,使得许多城市建成环境中的慢行路网完整性、行走安全性遭到破坏,加之不断严重汽车尾气、雾霾天气,让步行、骑车面临挑战的同时也增加了受污染的机率.%The choice of two basic means of travel of walking and cycling in line with the concept of urban green travel and it is also a shortcut to increase physical activity and enhance physical health. However, the city development concept of maneuvering efficiency makes the slow road network and walking safety be destructed in many cities. Coupled with the continuous serious automobile exhaust, fog and haze, the challenge and the probability of contamination of walking and cycling are also increased.
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