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Delhi continues to battle smog, alarming levels of PM 2.5

IndiaDecember 8, 2015, 8:36 am

The World Health Organisation declared Delhi the most polluted city in the world because it has an average PM 2.5 level of 153 micrograms per cubic metre. Particulate 2.5 are dust particles, combustion particles, organic compounds, metals and are hazardous as they get lodged in lungs and blood stream. A PM 2.5 level of upto 60 micrograms per cubic meter is considered safe.

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