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The Air Quality in Delhi, the capital of India, according to World Health Organization (WHO) survey of 1600 world cities, is the worst of any major city in the world, including Karachi, and Beijing, which also have poor quality of air. The two other cities, in India, that have worse air quality than Delhi, are Gwalior, in Madhya Pradesh, and Raipur, in Chhattisgarh.〔 Air Pollution in India, it is estimated, kills 1.5 million people every year; it is the fifth largest killer in India. India has the world highest death rate from chronic respiratory diseases, and asthma, according to WHO. In Delhi poor quality air damages irreversibly the lungs of 2.2 million or 50 percent of all children. == Particulate Matter levels in Delhi== Air quality or ambient (outdoor) air pollution is represented by annual mean concentration of Particulate Matter PM10 (particles smaller than 10 microns) and PM2.5 (particles smaller 2.5 microns, about 25 to 100 times thinner than a human hair).〔(【引用サイトリンク】url=http://www.who.int/phe/health_topics/outdoorair/databases/cities/en/ )〕 The world's average PM 10 levels, for the period 2008 and 2013, based on data of 1600 cities in 91 countries, range from 26 to 208 Micrograms per Cubic Meter of Air(ug/m3), with a world's average being 71 ug/m3.〔 13 of the 25 cities worldwide with the highest levels of PM are in India. In 2010, the year of the WHO survey, the average PM 10 level in Delhi was 286, and PM 2.5, in 2013, was 153, a level considered very unhealthy. In Gwalior, the city with the worst air quality in India, the PM10, and PM2.5 levels were 329, and 144 respectively. By way comparison the PM 10, and PM 2.5 levels in London were 22 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Air Quality in Delhi」の詳細全文を読む スポンサード リンク
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