Smog Forces Closure of Schools, Airport in Chinese City

Harbin, capital of the Heilongjiang province

BEIJING (Reuters) - Choking smog all but shut down one of northeastern China's largest cities on Monday, forcing schools to suspended classes, snarling traffic and closing the airport, in the country's first major air pollution crisis of the winter.

An index measuring PM2.5, or particulate matter with a diameter of 2.5 micrometers (PM2.5), reached a reading of 1,000 in some parts of Harbin, the gritty capital of northeastern Heilongjiang province and home to some 11 million people.