At least as serious.
Circulated on the Internet, said the top ten urban air pollution: 1. 2. Shijiazhuang, Tangshan, Xingtai 3. 4. 5. Handan Jinan, Zhengzhou 6. 7. 8. Beijing Baoding Hengshui .9 10. Tianjin. Beijing only routed eighth. Beijingers just always said this thing, do people always thought the first air pollution in Beijing.
Although this ranking is slightly rough, but how many points can explain the problem. Based on my experience in terms of air pollution reports, I guess the author may be based on a certain day or time, domestic air pollutants in some cities, such as the level of PM2.5 concentration on, come to such a ranking. However, each urban air quality will change every day, so the air pollution standings ranked first in Shijiazhuang, Shijiazhuang might feel injustice. Similarly, the Beijing ranked No. 8, may underestimate the severity of air pollution in Beijing.
Beijing may not be the most serious air pollution in Beijing, Tianjin city. The reason is simple, because the air pollution in Beijing, Tianjin and the whole region are very bad.
MEP term in April 2013 for the first time released PM2.5 pollution in cities across the country report. 74 national urban air quality reports in the first quarter of 2013, the worst air quality in 10 cities in seven were in Hebei Province. If the air quality rankings in March, Beijing can be ranked No. 17, Beijing and surrounding cities, including Tangshan, Shijiazhuang, Xingtai, Baoding, Handan, Langfang air pollution are among the top 10.
Comparison of the two cities air pollution is live gate technology. Ranked as a class as student achievement, you have to take two monthly tests are delineated ranking, or ranking the final have to choose three core subjects is a comprehensive score, or seven subject scores.
Evaluation of the severity of air pollution than to academic rank is more complicated. PM2.5 air pollutants just one. Daily average concentration of a city with annual mean concentration of PM2.5, can be a huge difference. And the domestic urban monitoring PM2.5 less than a year, many of the key data, lack important information or unpublished.
But one thing is certain: Based on the available information, air pollution around the city of Beijing in no way optimistic than Beijing.
Studies have shown that the concentration of particulate pollutants in BTH Region synchronization effect occurs geographical scope can be extended to within 450 to Beijing as the center of the range of one thousand meters. This means that when Beijing consecutive usher in "dirty" days, Beijing, Tianjin and the whole region is also difficult to clean silos.
An important feature of this is the moment to show the Chinese air pollution - large urban agglomerations combined pollution. Beijing, Tianjin is the case, the Yangtze River Delta, Pearl River Delta region, too, no city can be spared. North Canton once the outbreak of severe haze, often more than the corresponding fall in urban areas the whole piece.
Analysis of Beijing Chinese Academy of Sciences researcher Yuesi severe haze days in early 2013, the Beijing pollution attributed to "Beijing car, Hebei coal, oil and gas Tianjin." Yuesi analysis was heavy fog caused traffic congestion in Beijing, forcing the vehicle idling or low-speed operation, a direct result of Beijing automotive pollutant emissions increased 5-10 fold. Hebei is the industrial city compared to Beijing and Tianjin each year only a few thousand tons of standard coal combustion, combustion Hebei annually up to 2.7 million tons of standard coal, produce large amounts of sulfur dioxide and dust emissions. Tianjin rich oil reserves, and its related industries, vast amounts of emissions of volatile organic compounds.
It is based on such a large area of Beijing, Tianjin and pollutants emissions, coal, motor vehicles, industrial, dust and other pollution sources constitute complex and diverse, Beijing, Tianjin and the whole region at any time into a very heavy pollution days.
A large part of Beijing's air pollution from neighboring cities. Chinese Academy of Sciences and Peking University researchers published in 2007 in research and Physics "Atmospheric Chemistry and Physics" international academic journal Atmospheric Chemistry show, Beijing PM2.5 in an average of 39% of the ingredients come from foreign sources. The study also found that if Beijing continued South winds, which is downwind in Hebei and Shandong, then the proportion of air pollutants in non-local produce will increase significantly. When the highest proportion of foreign sources of pollutants can be accounted for Beijing pollutants over Liucheng.
Back to the original question, we can say: bad Shijiazhuang, Tangshan, Langfang who, with bad Beijing, together constitute the worst air quality of Beijing, Tianjin.
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