Hong Kong looks to tackle its pollution problem
3 October 2013 Last updated at 01:39 BST
In Hong Kong, the air pollution is sometimes so bad that its famous skyline becomes completely covered in smog.
But now, the government is getting tough as it looks to tackle the issue.
It wants lawmakers to approve a $1.5bn (£924m) project that would see old commercial vehicles taken off the road.
Juliana Liu has more on a move that is being billed as one of the most ambitious environmental projects in the world.