Fresh Air in a Can For Sale in China

Beijing's a hazy shade of toxic

For the fourth time this year, a murky haze has descended over north China, leaving residents of Beijing choking on toxic smog. China's air hasn't been this bad since 1954, according to the state-run People's Daily newspaper.

In a remarkable record of dirty air, 24 out of January's first 29 days this year had air classified as hazardous. And the skies have still not cleared.