Delhi on Monday woke up to a hazy morning. The overall Air Quality Index of the national capital was recorded at 369 which falls in the very poor category, according to SAFAR (System of Air Quality and Weather Forecasting and Research). Authorities attribute the dip in air quality to localised factors like construction dust, vehicular pollution as well as regional factors like pollution due stubble burning from Punjab and Haryana. Stubble burning would contribute to 15 per cent PM2.5 per cent pollution on Monday," an official with the SAFAR said.