3Photo© dnaindia.comTrains delayed as dense fog engulfs Delhi-NCR region, air quality remains poor
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The people of Delhi experienced a foggy morning with reduced visibility as the air quality of the national capital continues to remain in the "severe" category on Sunday.
Delhi's air quality continues to remain in the ''severe'' category, with the overall Air Quality Index (AQI) standing at 428, as per the System of Air Quality and Weather Forecasting and Research (SAFAR) on Sunday.
An AQI between 0-50 is marked good, 51-100 is satisfactory, 101- 200 is moderate, 201- 300 is poor, 301-400 is very poor and 401-500 is considered severe.