中国城市“公交周及无车日活动”自昨日起在全国108个城市同时举行。北京、上海、天津、杭州等城市均宣布加入这一活动。那么，“无车日”怎么说呢？

请看新华社的相关报道：

The campaign, with an attempt to raise residents' awareness¹ on energy saving and environmental protection, encourages people to walk, ride bicycles and take public transport facilities like buses and subways rather than drive private cars.

During the campaign, the 108 cities will set one or more zones which open only to pedestrians², cyclists, taxi and bus passengers between 7 am and 7 pm on September 22, or the "No Car Day".

报道中说，活动期间，108个城市将在9月22日7时至19时组织“无车日”活动，号召市民尽可能选用公共交通、自行车、步行等方式出行，减少对小汽车的使用和依赖。政府将划定一个或数个区域（道路）只对行人、自行车、公共汽车、出租汽车等开放，提高居民节约能源与环境保护的意识。

这里的“No Car Day” 就是“无车日”；另外，“公交周”可以说成“traffic week”，“绿色公交周”就是“green traffic week”。