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The author:(作者)aaapublished in(发表于) 2014/12/10 8:26:04 Beijing smog， air quality dropped as much for severe contamination
CNS, Beijing, December 9 (reporter Yin Li)-9th, nightly cold and sunny weather in Beijing is no longer, return of the haze and the city once again reduced to severe pollution levels of air quality as much. Forecasts showed that the pollution lasted only a day, will soon have the cold air arrived in an emergency.
Since December, cold air frequently visited the capital, good atmospheric diffusion conditions make fog nowhere to hide, the overall air quality remain at high levels. Due to the deterioration in the diffusion conditions, 9th, haze again enveloped the capital. That morning sky is gray has the capital scene. Under the influence of smog, visibility was 5 to 10 km in most areas.
9th, at 9 o'clock, Beijing's air quality fact sheet figure appears as a representative for the kinds of purple and reddish-brown. 35 stations in the city, located in the urban area and South of the 13 sites showed severe pollution levels, there are 12 sites to achieve high levels of pollution levels, the primary pollutants for PM2.5. Data shows that Beijing has more than 200 μg/m3 PM2.5 concentrations of most, some of the site's real-time PM2.5 concentrations as high as over 300 micrograms per cubic meter.
Senior Engineer of the Beijing environment protection monitoring Center said Sun feng, from the evening of 8th Beijing spread around the country began to slip, and atmospheric conditions tend to be static stability, the humidity in the air increases, smaller surface wind speed and to southerly, rapid accumulation of pollutants. Meanwhile, pollution of the surrounding area along with the southerly flow to Beijing. Therefore, 9th all day, Beijing's air quality will reach the high levels of pollution and above level.
According to statistics, the week after the APEC Conference, in late November so far this year, Beijing a total of three heavily polluting processes, namely November 18-20th, November 26 and November 29, if today was the fourth. Sun Feng said, after twice fouling process is rather special, is a pollutant concentrations rising rapidly in a very short amount of time, resulting in one-day heavy pollution and high levels of pollution, to the severe and serious pollution levels, and the process is somewhat similar to this pollution.
The good news is that shorter duration over which the pollution. According to the Beijing environmental protection Bureau forecast showed that 10th cold air arrived in a timely manner the rescue, when air quality will be restored to a good level, and maintaining a good state for four days. (End)
(Original title: Beijing air quality dropped to severe pollution as much smog)
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