Worse yet, it will linger until Saturday, when the wind will pick up and disperse it, the bureau predicted.

The Chinese Center for Disease Control and Prevention suggests people stay at home to protect themselves from respiratory and heart problems triggered by heavy smog.

"The intensity of indoor pollutants is 30 to 60 percent lower than those outdoors during a hazy day," said Xu Dongqun, an officer at the environmental bureau. "I suggest people with respiratory problems put off traveling if the smog lingers."

But many people said they had to brave the foul air to travel, especially migrants who are eager to reunite with their families during Spring Festival.

Questions

1 What was the PM 10 measure in Beijing this week?

2 Where was the highest measure taken?

3 How long is it supposed to linger?

Answers

1. Most monitoring stations measured PM 10 (particulate matter smaller than 10 micrograms) at higher than 300 micrograms per cubic meter.

2. Southwestern Beijing's Fangshan district, recording 516 micrograms of PM 10 per cubic meter

3. Until Saturday, when the wind will pick up and disperse it

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