People visit the Tian'anmen Square in Beijing, capital of China, Jan. 11, 2013. The PM 2.5 (particles less than 2.5 microns) data in Beijing hit 240 to 446 on Friday, which means the 6 rating heavily polluted air quality.
Thick fog and haze shrouded central and northern parts of China on Friday, with Hebei and Henan provinces among the most polluted areas, monitoring data showed.
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