Errors in Reporting of Bejing Air Quality
To the Staff of AP,The AP has recently produced the report below, which I believe contained errors.
http://hosted.ap.org/specials/interactives/_international/oly_fea_pollution/index.html?SITE=WIRE&SECTION=HOME
Based on AP's report, AP has measured the air quality of Beijing, near the Bird's Nest during day time, each day, for 2 hours. AP has also matched it against the WHO guideline of 50 microgram per cubic metre.
Based on the WHO information below, the guideline is meant for samples taken over a 24hr period and then averaged. WHO also noted that the short term (24hr) exposure tolerance is higher than the long term (1 year).
http://whqlibdoc.who.int/hq/2006/WHO_SDE_PHE_OEH_06.02_eng.pdf
As human activities take place during the day, the measurments taken by AP may not be representative of the 24hr average. While AP figures may accurately portray the level of pollutants an outdoor athelete was be exposed to during the Games for those 2 hours, AP should seek academic advice to convert the 24hr WHO guideline to a 2 hr tolerance level for PM10, or if a 2hr measurement has any scientific significance.
If one is to assume the good faith of SEPA, who's data AP has included in it's report, it is possible to determine the upper limit of the PM10 average for each day by consulting the chart provided by the link below (in Chinese). According to the chart, API of 50 means PM10 daily average of at most 50 micro gram per cubic metre. Thus, in at least 10 out of the 16 days, the air quality in Beijing did in fact met the WHO's highest standard for daily average, where as AP's current presentation resulted in 5 out of the 16 days passing the benchmark. In addition, in none of days was the Interim target 1 breached (PM10 above 150), while AP data reported 7 days.
http://www.sepa.gov.cn/quality/background.php
The method used by AP to measure air quality did not conform to the definition prescribed by the WHO guideline, it would not be apprporiate for AP to present it as a benchmark. It appears that the information presented by AP has overstated the level of air pollution in Beijing. While it is difficult for AP to measure air pollution around the clock, AP could have resorted to other sources/methods to determine pollution level.
In addition, AP has stated that 50 microgram per cubic metre as the "target for developing countries" appears misleading based on the WHO guide above. The figure 50 is the WHO "guideline" for PM10. Above which WHO also set "targets". The Interim target 1 for PM10 concentration is 150, which somewhat corresponds to API of 100 by Chinese standards, which is also the current Chinese policy "target". AP's definition of "target" appears most appropriate for developed nations. If one choses the WHO's definition of "target" and methodology it appears the air quality in Beijing did reach its target consistently for standards applicable to a developing nation throughout the Games. However, using AP's data and definition, Beijing failed the pollution test by a shocking 1100% on August 10th!! It would be understandable why some atheletes had to wear masks or quit the Games altogether.
The report produced by AP appears materially inaccurate and misleading.
dy/dx 老大，能弄成中文的吗？全是英文看的眼疼啊Q76) Q76) Q76) Q76) 大意是说，世界卫生组织发布的空气质量指导意见和我国环保部的空气质量一级（优）标准，都是要求可吸入颗粒物的24小时平均值不高于50微克/立方米。
美联社每天下午测量可吸入颗粒物的两小时平均值，但是仍然用24小时平均值的标准来要求，这是错误的。
因为夜间空气质量比白天好很多，所以下午两小时平均值一般要比24小时平均值高出很多。
所以奥运的16天里，美联社的数据只有5天低于50微克/立方米，但是环保站的数据显示有10天达到一级标准。
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