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published in(发表于) 2014/9/8 11:41:47
Nanjing Youth Olympic Games a month fewer 1750 tonnes PM2.5

Yesterday, the Nanjing Youth Olympic Games to ensure air quality expert group released the air protection data, throughout August, Nanjing 3764 tons fewer than normal 1750 tonnes of PM2.5 and PM10. Declined 44% per cent and 36%. It is understood that the air quality during the Youth Olympic Games "excellent" grade forecast accuracy 75%~80%.

Nanjing Youth Olympic Games air quality assurance team leader, Professor of atmospheric science at Nanjing University Wang tijian said the air quality during the Youth Olympic Games is not easy, there are three "crisis" moments, but by strengthening controls pass, Youth Olympic Games experience will also be guaranteed by providing references for heavily polluting State.

Modern Express Reporter An Ying

Youth Olympic Games during a 3-hour "light pollution"

Nanjing air quality from excellent to pollution these days, fresh air when people nostalgic for the Youth Olympic Games.

Wang tijian told reporters in modern Express, air quality during the Youth Olympic Games has not been smooth, there are three special moments, but timely detection of the expert group, signs of contamination "pressure" it down.

Wang tijian said the Youth Olympic Games to ensure air quality team accurately predicted two days in advance, August 16, the Youth Olympic Games opening day poor dispersion conditions, so from the 14th most strict management measures taken, eventually guarantee the good air of the opening ceremony.

On August 20, the forecast model, Wang tijian have found air pollution upgrade is likely to appear in the 22nd. "Predicted by the models, Jiangsu is a large area of the pollution. "In consultation with the predicted results of the expert group to start the" enhanced Edition "emergency measures for air protection and surrounding cities including Nanjing site shutdown, industrial production and so on.

The most soul-stirring pollution occurred on August 25, Nanjing wind speed over day is very small, atmospheric boundary layer is only 300-400 meters high. Meanwhile, neighboring city is heavily polluted. In such polluted conditions, starting from around 11 o'clock in the morning to enter the air pollution in Nanjing and lasted 3 hours. "If emergency measures are not taken, pollution is more than 3 hours. "Wang tijian said that this regional pollution in Nanjing" resist. " Monitoring results show that when the concentration of air pollutants in Yangzhou and Zhenjiang and other cities is more than 150 micrograms per cubic meter, Nanjing is 65-70 micrograms per cubic meter.

In August, Nanjing air people breathe "toxic" sapped

During the Yog, Nanjing people breathing the air and usually have a much different? Wang tijian provides a set of data: from August 1 under the temporary control of major pollutants reduction, PM10 reduction was the highest compared with July down 44%, reduces 3764 tons, only site shutdown, reducing 2123 tons.

Of PM2.5 in August compared with July, 1750 tons was reduced, with a 36% drop.

Monitoring data show that through industries such as electric power, building materials, chemicals, transport control, sulphur dioxide, nitrogen oxides, carbon monoxide, volatile organic compounds in the atmosphere of "chemicals" were dropped, 33.6%, 19.6% and 19.4%. Wang tijian introduced into PM2.5 in the air of major gaseous pollutants are sulphur dioxide, nitrogen oxides, ammonia and volatile organic compounds. Various pollutants decline, said changes in PM2.5 connotations, and control than before, virulence.

Air precise forecast, more difficult than forecasting the weather

PM2.5 concentrations of tomorrow will not be very high? On my way to work to avoid wearing masks? You want to know the answers to these questions if needed accurate forecasts of air quality. Wang tijian admits that air quality forecasting more difficult than weather forecasting.

Wang tijian introduces first of all sources of uncertainty makes it difficult. Numerical forecast of experts do, need cities and construction of the entire source distribution data. Only motor vehicle pollution, for example, motor vehicles per day on the major roads of the city has changed so much, traffic not only is changing, models are changing, there is changing speeds, emissions, pollution and hard to grasp. Second, weather forecast accuracy is also an important factor. Although forecasting accurate things than ever before, but Wang tijian believe that there is still much room for improvement. Third, the complexity of air quality forecast model.

Wang tijian believes that prediction of the Youth Olympic Games is not perfect, and trend forecasting, but in terms of predicting, with real-time observation is still a little gap, he hoped the more sophisticated scientific research can predict PM2.5 components in the future.

Heavy pollution weather a day before the warning, time and stress

Youth Olympic Games practice showed, once predicted that air pollution, to take emergency measures to control local sources in advance, will definitely deteriorate the air plays role in mitigation.

Pollution days in February of this year, Nanjing also perfect released the heavy pollution weather emergency plan, Nanjing. Improved early warning programmes, the biggest change is based on the levels of air pollution, set, blue, yellow, Orange, red and four levels of warning issued, and in order to take the different pollution reduction measures. In particular red warning of heavy pollution days, enterprises should not only limiting vehicles to odd-row.

The implementation of the early warning and response measures according to the rule, starts 1 day in advance. In response, Wang tijian said, "this time a little bit nervous, plus from release to also have a process. According to the Youth Olympic Games experience, at least two days in advance warning and take measures, the effect will be better. "He said that if two days in advance to air pollution, the air still in the" early cold "to take immediate measures, equivalent to some banlangen, probably down cold. If has entered the air pollution status, or has a bad cold, when taking measures to rely on water and the effect is much less than before.

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