Beijing’s air pollution

Haze surrounds the Forbidden City on a polluted day in Beijing on the last day of China’s weeklong National Day holiday on Oct. 7.

A man on a cart carries a load of foam on a polluted day in Beijing on Oct. 6.

Air quality readings in Beijing on Oct. 7 were at levels considered hazardous by international measuring standards.

It is usually a peak time of the year for tourist travel, but for the second day in a row, air quality readings Oct. 7 in Beijing were at levels considered hazardous by international measuring standards.