Every year when winter arrives, India's capital region is choked by smog and smoke. However, seasonal crop burning fires in neighboring states of Punjab and Haryana add to Delhi's air pollution. Unlike Mumbai,

The air quality in the national capital fell back to 'very poor' from being in 'severe' category a day before.

Strong surface winds (at speeds of 15km/hr) that had helped disperse pollutants on Sunday, dropped to near-calm levels of 4-6km/hr by Monday morning, leading to a haze engulfing the city again. Delhi’s 24-hour average air quality index (AQI) was recorded at 285 (“poor”) at 9am on Monday,