Imagine you’re an airline pilot. Which of the cities below looks like the more appealing one for landing a large jet?

To the left, an image of Beijing’s air taken last week when the pollution monitor on top of the U.S. Embassy measured a fairly low level of particulate pollution (29 parts per million per volume). To the right? The air yesterday, at a level of 462. If you chose the image at left, congratulations. Airlines in Beijing agree with your assessment.

From Huffington Post:

Thick, off-the-scale smog shrouded eastern China for the second time in about two weeks Tuesday, forcing airlines to cancel flights because of poor visibility and prompting Beijing to temporarily shut factories and curtail fleets of government cars. …