In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts. In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts.
In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts.

A new front in Hong Kong's war on pollution

In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts. In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts.
In many urban districts, canyons of tall buildings line streets, restricting the dispersal of emissions from vehicle exhausts.
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