Time Lapse of Rolling Smog Gives Glimpse of Beijing's Pollution Problem

The air quality was considered hazardous this weekend by the U.S. Embassy.

— -- A time-lapse video showing smog rolling into Beijing over a 20-minute period gives a glimpse of the pollution problem in China's capital city.

Chas Pope, a British engineering consultant working in Beijing, shot the video.

An air-quality index released by China's municipal environmental protection bureau, which measures potentially hazardous particles in the air, hit 482 on Sunday, almost touching the 500 mark where the scale tops out, and far beyond the point deemed hazardous to health, according to the South China Morning Post.