Air pollution in many of the worlds cities is breaching guidelines set by the World Health Organization (WHO).
Its survey of 1,600 cities in 91 countries revealed that nearly 90% of people in urban centres breathe air that fails to meet levels deemed safe.
The WHO says that about half of the world's urban population is exposed to pollution at least 2.5 times higher than it recommends.
Air quality was poorest in Asia, followed by South America and Africa.
(Score: 2) by krishnoid on Thursday May 08 2014, @12:42AM
There's an interactive smog simulator [marketplace.org] that simulates the appearance of large US cities at various Air Quality Indices.