Heading toward the evening of five heavily polluted air of Beijing Ying this early winter snow, or heavy pollution _ | | air quality news

According to the latest analysis of meteorological data, Beijing is expected to appear before this evening to midnight since this winter's first snowfall in the city. But before due to high humidity, and the cold air has not been reached, small wind, serious temperature inversion, Beijing's air quality deteriorated sharply, according to the municipal environmental protection monitoring center predicted that Beijing's air quality today will fall into the category five severe pollution.

Beijing Times reporter Wang Shuo

Air quality

Today the city's five heavily polluted

Since December, Beijing air care, air quality has been maintained at a high level. However, according to the latest analysis of meteorological data, and gradually weakened due to Beijing's pressure, beginning last night, once again plagued by smog in Beijing, is expected today to have mild to moderate haze, local or have a severe haze.

"Small wind, humidity, temperature inversion is serious, are important factors of the formation of the fouling process. "The Beijing environment protection monitoring Center says senior engineer Sun feng, in addition, under the influence of southerly winds, zone transfers in this pollution is also evident in the process. Sun Feng said in as much pollution in North China, it is known that as of yesterday afternoon, Baoding, Shijiazhuang, Tianjin, Tangshan and other places have reached high levels of pollution.

Yesterday afternoon, surface wind field in Beijing had changed from northerly to southerly. Beijing environmental protection monitoring center monitor display, up to 4 o'clock in the afternoon, the southern city and six district in Beijing has reached mild to moderate pollution levels. According to the municipal environmental protection monitoring center forecast today, Beijing's air quality will continue to slip, the city is expected to reach more than five levels of severe pollution levels.

"However, the pollution will not last, is just ' one-day pollution. '" Sun feng, said starting from tomorrow morning, new cold air will affect Beijing and North again, Beijing's air quality will be excellent return.

Published yesterday, the Beijing environmental protection monitoring center of the air quality forecast, based on the analysis of existing data, 11th-13th, Beijing's air quality will be maintaining a high level, but the 13th will begin to slip, 14th are expected to reach moderate levels, 15th strong cold air return, all the way to 18th, the capital will be a nice day.

　≫> construction

Yesterday the air quality is still excellent, today fell into the heavily polluted, changing so fast?

　Zone transfers increased local pollution

Senior Engineer of the Beijing environment protection monitoring center Sun feng, said the contamination in the process first regional proliferation conditions worsening in Beijing, small wind, humidity, and temperature inversion is serious, neither spread spread horizontally or vertically are significantly decreased, while at the same time, higher concentration levels around Beijing, and surface wind field dominated by southerly winds, so that zone transfers are clear.

According to the Beijing Municipal Bureau of PM2.5 source apportionment results released earlier this year showed, judging from the sources, Beijing 28% to 36% of PM2.5 from zone transfers, in particularly heavy pollution in the process of regional transport contribution is above 50%.

　Meteorological conditions

Evening Beijing or falling snow

Last week, around Tangshan, Qinhuangdao and Tianjin have ushered in this early winter snow, Beijing is not far behind. According to the latest meteorological data analysis, East moving cold air from the Southwest intersection of influence this evening to earlier in the evening or in Beijing will usher in the first snowfall of the year, but small amount of snow expected is about 1 mm of precipitation.

Beijing professional meteorological weather service Chief Liu yan to introduce, the precipitation conditions conducive for upper has better moisture conditions, upper level trough combined with cold air from hijacked; adverse conditions are: uplift low-rise although there is convergence, but low pressure Center North, this means that the maximum precipitation may not be in Beijing.

Experts estimate that the snowfall will begin in the lead in the mountains of Western, and gradually extended to the whole city, flurries later tonight snow will gradually end, expect snow less than 1 mm in most areas, and large snowfall in the North.

According to reports, most of Beijing's first snow of the year before and after time on November 29. From 1951 to the present Beijing snow date is February 9, 2011 at the latest. Beijing's first snow day in history on October 31, 1987, the first time mostly in the 11, December.

But experts estimate that before the snowfall last night till today, surface pressure field is weak, the meteorological conditions not conducive to the proliferation of air pollutants. 4-5 northerly wind blows through Beijing after snow and fog dissipates during the day tomorrow, reproduce the blue sky in Beijing.

　Hot concern

Chinese Academy of meteorological Sciences expert:

Air pollution in coal is the culprit

Yesterday morning, the 2014 cast hot topics Symposium held at the China Science and technology Hall. Atmospheric composition of Chinese Meteorological Society Committee, the Chinese Academy of meteorological sciences researcher Zhang shuffling made a presentation entitled the smog in China formed the fundamental causes and countermeasures of academic reports.

According to media reports, shuffling in its report pointed out that coal smog as the representative forms of air pollution plays a most important role, not clean energy use, is the fundamental cause of the haze. This clean-energy sources, most notably coal. Reports for motor vehicle smog impact much, shuffling, motor vehicle exhaust is still serious influence on haze, but no coal-fired badly.

On vehicle emission contribution to PM2.5 in Beijing, this is not the case. Issued by the Beijing municipal environmental protection Bureau, Beijing PM2.5 source apportionment results show that annual PM2.5 sources in Beijing, zone transfer contributions to accounted for 28%-36%, local pollution emission contribution is the 64%-72%. In the contribution to local pollution and vehicle emissions (31.1%), coal (22.4%), industrial production (18.1%) the proportion of occupied the top three motor vehicle emissions are the biggest contributors to PM2.5 local sources in Beijing.

Coal has been the atmosphere in Beijing controlled vehicle, governance of the hand. According to the Beijing Municipal Government issued on speeding up the coal-fired reduction programme for the promotion of air quality improvements, in 2010 the city's coal to total about 26.35 million tons, about 19.3 million tons of coal for power generation, heating, accounting for about 73%; about 7.05 million tons of coal for industrial use, accounting for about 27%. The programme put forward by 2015 the city fall to about 15 million tons of total coal-fired, burning coal's pollutant discharge reduced by about 60%.

Meanwhile, Beijing automotive holdings for 5.5 million vehicles a year. In order to reduce vehicle emission, over the years, Beijing actively phase out all yellow tagged vehicles and old cars. It is understood that, at the end of November, Beijing out of old car this year to 426,000 vehicles, exceeding 391,000 vehicles ordered by the Ministry of environmental protection tasks and become the nation's first basic yellow tagged car city. In addition, the city's vehicle emission standards and fuel standards has been leading the country, currently has implemented five standards and put forward six standards would begin in 2016 at the first.

(Original title: this heavily polluted snow Chase and haze)

Beijing times