A FACTORY fire in eastern China went unnoticed for three hours because of the thick smog that blanketed large stretches of the country this week, state media have said.



After firefighters in Zhejiang province were finally alerted to the blaze in the early hours of Monday they took 10 hours to extinguish the flames, which destroyed a large amount of furniture, the Xinhua news agency said.



"Because of the thick fog pervading the air at the time, the initial smoke and flames produced by the fire took an unexpected almost three hours to be discovered by nearby residents," Xinhua said.



The unusually dense air pollution across much of China this week reached levels dangerous to human health and prompted public criticism of the nation's breakneck development.

On January 12, the peak of the current air crisis, AQI was 775 the U.S Embassy Beijing Air Quality Monitor—off the U.S. Environmental Protection Agency scale—and PM2.5 was 886 micrograms per cubic meter.