smog

It's a provocative move expected to result in a major legal battle.
Poor air quality causes nearly 1.1 million people to die prematurely in India each year, the study says.
It sounds whimsical, but Dutch artist Daan Roosegaarde turned his sustainable design experiment into reality.
Several cities have banned fireworks because of air pollution.
It is the second ever "red alert."
Officials issued a "yellow alert" for smog in Shanghai this week.
Smog in Chinese metropolis Shanghai hit its highest level since January on Tuesday.
Customers were unhappy with the 15-cent fee.