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Delhi’s air quality turned “severe” on Friday, with the air quality index (AQI) crossing the 400-mark after nearly three weeks. A combination of factors like slow wind speed, low temperatures and a low boundary layer are all aiding the accumulation of pollutants with similar conditions expected to persist till December 10, officials said.
from Delhi News, Latest Delhi News Headlines & Live Updates - Times of India https://timesofindia.indiatimes.com/city/delhi/shallow-to-moderate-fog-likely-in-delhi-today/articleshow/72407865.cms