It is one of the greenest national capitals in the world. Its metro transit system caters to around 23 lakh passengers daily and government buses are running on clean CNG. But Delhi continues to remain the country's most-polluted city. A study funded by
the Ministry of Science & Technology has identified the metropolis as a "high health risk" zone, stating there is an alarming rise in the level of outdoor particulate matters (PM) in the city.
"The pollution in Delhi has increased by 21 per cent in the last 10 years and is persistent. For more than 50 per cent of the day, the pollution is high in the city and is sustaining for long periods. This is posing a major health risk to its people,"
said Dr Sagnik Dey, assistant professor, Centre for Atmospheric Sciences, IIT Delhi, who led the research team. "Humans, if exposed to particulate matter for a long time, are at a high risk of respiratory and heart diseases," he said.
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