WHO report says Indian cities have the worst air pollution in the world
An international report quantifying pollution levels has revealed New Delhi, India's capital, to be the world's most air-polluted city, confirming findings from some experts. These experts are astonished by New Delhi's apparent lack of attention to the problem. PM2.5, particulate matter smaller than 2.5 micrometers in diameter, is considered a major health risk due to its ability to penetrate deep into the lungs. On Thursday, air pollution monitors in New Delhi recorded PM2.5 concentrations exceeding 350 micrograms per cubic meter. This was one of the highest levels recorded in Asia that day, more than double the morning peak in Beijing as reported by the US Embassy in China. A WHO report examining pollution levels in nearly 1,600 cities across 91 countries from 2008 to 2013 found that Delhi's annual average PM2.5 concentration was 153 micrograms per cubic meter. The Indian cities of Patna, Gwalior, and Raipur followed closely behind Delhi, ranking among the most air-polluted cities. Delhi's pollution levels were almost three times those of Beijing, whose annual average was 59. A New York Times article in January 2014 claimed that Delhi's PM2.5 concentration was at least twice that of Beijing, resulting in pollution issues making headlines in India's largest newspaper for several weeks, though government officials strongly denied the claims. The Indian official agency, the System of Air Quality Weather Forecasting and Research (SQFR),...