A thick layer of smog lingered over Delhi and its adjoining areas this morning as the pollution levels slipped into the severe category again after the numbers showed a marginal improvement on Wednesday. The air quality index or AQI was 408 at 7 am as a result of farm fires in the neighbouring states and emissions from the smoke-belching vehicles. Besides these two factors, unfavourable meteorological conditions also serves as a key driver for pollution in the national capital.
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