U.S. data misidentified
The United States "Wall Street Journal" quoted a study by the National Bureau of Economic Research on March 30 stating that during the Beijing Olympic Games, the Chinese government successfully increased the air quality in Beijing by 30%, but about one year after the Olympic Games, about 60% of the improvement has disappeared.
Du Shaozhong cited the monitoring data of the Beijing Municipal Environmental Protection Agency that during the Olympic Games, the air quality in Beijing has been significantly improved, and all pollutants have been reduced by more than 50%. “I don’t know how the data evaluation of '30%' in the US report was obtained.†.
He also pointed out that as for the "a year after the end of the Olympic Games, about 60% of the improvement results have disappeared." The assessment is even more contrary to the facts.
Increased "blue sky" after the Olympics
According to statistics from the environmental protection department in Beijing, 2009 after the Olympic Games was the most outstanding year for atmospheric environmental quality in Beijing since 1999, achieving 285 air quality standard days in the year, 11 more than the “Olympic Yearâ€11 day.
In 2010, Beijing completed its annual “blue sky†goal almost one month ahead of schedule; in January 2011, Beijing’s air quality was all up to standard. This is the first time since 1998.
Hao Jiming, Dean of the Institute of Environmental Science and Engineering at Tsinghua University, believes that after the Olympic Games, apart from the long-term measures that have been reserved for motor vehicle single and double number restrictions, some temporary measures have been lifted, which has contributed to the continuous improvement of air quality after the Beijing Olympic Games. It is Beijing that has been adhering to more than 10 years of air pollution control measures and industrial restructuring plans.
The beauty test method is too harsh
The Wall Street Journal also mentioned that the hourly air quality monitoring data released by the US embassy in China indicates that there are not many “good†times.
In response, Zhu Xi, professor of the School of Environmental Science and Engineering at Peking University, explained that the US embassy in China mainly monitors PM2.5 (suspended particles with a diameter of less than 2.5 microns). The Beijing environmental protection department mainly monitors PM10. This is different from the first. Observed objects are even different in composition.
Zhu Xi said that the Beijing environmental protection department's data is a 24-hour average of the city's 27 air quality monitoring stations. It would be unscientific if it compares with the hourly maximum value of a monitoring point at the US Embassy.
It is understood that, at present, except for some countries in the United States and the European Union, most of the world’s countries are monitoring the PM10.
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