Off-the-charts air pollution in Beijing has affected all residents of the Chinese capital in recent days, including The World's Mary Kay Magistad. She speaks with anchor Jeb Sharp about what life in Beijing is like when the air becomes unbreathable.
(This story is based on a radio interview. Listen to the audio to hear it.)
*UPDATE: A previous version this report included incorrect dates for the photographs of the CCTV Headquarters building. The correct dates are now reflected in the photo captions. We regret the error.