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3. You might have heard about the smog.They're working on it
你可能已经听说了墨西哥城的大雾。他们已经在着手解决了
Pollutionin Mexico City used to be so bad that children painting pictures of the skyreportedly would color it gray, not blue. Because of its geographic location -- in avalley between mountains -- and the sheer number of cars traveling its streets,smog is a problem the city is still battling. But with government programs thatencourage bike-riding and limit the number of days motorists can take to thestreets, longtime residents say the pollution problem is much better than itused to be. Another innovative solution debuted lastyear: a hospital tower covered with a facade designed to "eatsmog," breaking down pollutants when the sun hits it. Designers saythe tiles on the facade of the Manuel Gea Gonzalez Hospital neutralize theeffects of 1,000 cars every day.
墨西哥城以往的污染特别严重，据说孩子们在给天空画画时会把天空描绘成灰色的，而不是蓝色的。
这主要归咎于其地理位置，位于两座山脉间的山谷里，城里有大量的汽车，雾霾依然是个严重的问题。政府采取了一些措施鼓励人们骑自行车，并且限制汽车可出行的天数，所以长期居住在这里的居民说现在空气比以往好多了。去年又颁发了一个新的措施：在一座医院大楼外面覆盖上一层立面，这种立面可“吸食雾霾”，当太阳照射在上面时就可以把污染物分解。设计者说立面上的瓷砖每天可以中和1000辆汽车的尾气。
