From my hotel room, it was possible to see the roofs of the Forbidden City, though only as a faint shape through the haze blanketing the landscape. Beijing (or Peking, depending on the language or spelling) is one of the most polluted cities in the world, covered by a constant smog produced not only by automobiles—which account for 70% of the city's air pollution—but also by factories, coal-fired power plants, and sandstorms from neighboring regions. It looked like a cloudy day, but in reality, there was not a single cloud in the sky.
