/   Home   /   Newsroom   /   News Updates

Smog Density in Beijing-Tianjin-Hebei down 30 pct

Mar 02, 2017     Email"> PrintText Size

The average density of PM 2.5, fine particulate matter that causes smog, in the Beijing-Tianjin-Hebei region dropped by 26.5 micrograms per cubic meter, or 30 percent, from 2013 to 2016, according to satellite data released by the Chinese Academy of Sciences (CAS) Wednesday.

CAS disclosed findings of its research on the causes, early warning, forecasting and surveillance of smog as well as clean coal technology, at a press conference in Beijing.

According to remote-sensing satellite data, despite the overall lowering of smog density in the region, air quality had worsened in Beijing during winter.

The average density of PM 2.5 in Beijing during winter jumped from 70 micrograms per cubic meter in 2014, to 89 micrograms per cubic meter in 2015, and to 110 micrograms per cubic meter in 2016.

Gu Xingfa, head of the Institute of Remote Sensing and Digital Earth of CAS, said the remote sensing satellite data proved that Beijing did make headway in smog control, but that public complaints about worsening pollution since the winter of 2016 were also valid. According to CAS research on smog, the average density of industrial and coal burning emissions in Beijing-Tianjin-Hebei region accounted for over one-third of the sources of PM 2.5 in the region.

Wang Yuesi, researcher with the Institute of Atmospheric Physics at CAS, said that when industrial emissions and smoke from straw burning drifted to Beijing from neighboring areas, they tended to accumulate in certain weather conditions and become a "lid" over the city's skyline.

Pollutants from within the city such as vehicle exhausts then accumulate under the "lid," resulting in secondary pollution, according to Wang.

In terms of meterological conditions, CAS research found that the last four decades saw slower winds in the Beijing-Tianjin-Hebei region, with average wind velocity dropping by 37 percent. Particularly, the frequency and velocity of the northerly wind, which helps disperse pollutants in the region, decreased markedly.

Wang Yuesi said that as smog control in China involved complex issues including the industry mix, energy mix and social economic cost, and that a major adjustment of the industrial and energy mix was beyond reach in a short time frame, there was a long way to go to drastically improve China's air quality. (Xinhua)

Attachment:

(Editor: CHEN Na)

Contact

Phone:
E-mail:

Related Articles

smog;haze;environment protection;air pollution

Premier Li Calls for More Research Efforts on Smog Formation

Mar 13, 2017

Premier Li Keqiang called for all out efforts to overcome challenges and find out how smog is formed during a meeting with delegation from Shaanxi province on March 9. ZHOU Weijian, an academician and head of the Institute of Earth Environment of the Chinese Academy of Sc...

haze;Beijing–Tianjin–Hebei region;regional persistent haze events;atmospheric circulation;dynamic mechanism

Scientists Work to Lift the Mystery of Persistent Haze

Mar 13, 2017

The researchers used standardized factors to objectively identify haze events in China’s national capital region of Beijing-Tianjin-Hebei from 1980 through 2013.They also found that the haze events had one of two specific circulation patterns, both of which can produce a...

Contact Us

  • 86-10-68597521 (day)
    86-10-68597289 (night)
  • 86-10-68511095 (day)
    86-10-68512458 (night)
  • cas_en@cas.cn
  • 52 Sanlihe Rd., Beijing,
    China (100864)

Copyright © 2002 - Chinese Academy of Sciences