Downtown Beijing in the clouds of its latest air pollution emergency.
January 29, 2013 Air quality readings put the Chinese capital's air in the hazardous zone; visibility is less than 200 yards in some parts of the city.
January 15, 2013 Pollution around Beijing has been stifling for the past few days. NASA has released a pair of satellite images, showing the extent of the smog from space and how the air has changed in the past couple weeks.
An ice-resurfacing machine races across a rink at Curt-Frenzel-Stadion in Augsburg, Germany.
Annette Zoepf/dapd via AP
March 1, 2012 Early last year 31 people got sick after spending time at an indoor ice arena owned by a private school in New Hampshire. Poor ventilation of exhaust from a machine used to resurface the ice turned out to be a big problem.
November 2, 2011 Even if people used bikes to run short errands than half the time, it could save more than 1,100 lives a year in 11 Midwestern cities, thanks to reduced air pollution and improved health. That's the word from scientists at the University of Wisconsin, who figured people would bike 4 months out of the year.
Can building exteriors really eat smog in cities like Los Angeles, pictured here?
June 30, 2011 The aluminum giant Alcoa wants to fight smog with a new building product. The company says its panels clean the air as well as trees, but research suggests trees can remove some pollutants the panels can't.
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