Beijing authorities announced the “yellow”, increased danger level, due to heavy smog.

The concentration of small firm particles of PM-2.5 hazardous to health in air of the Chinese capital has made about 200 micrograms on cubic meter.

According to the norms of the World Health Organization, daily safe dose of particles of PM-2.5 should not exceed 25 micrograms on cubic meter, TASS reported.

The authorities also recommended children, elderly people and people with respiratory diseases to refrain from long stay on streets.