Winds blow away haze, pollution levels in Delhi-NCR dip but still 'severe'

There was a visible improvement in the national capital's air quality on Monday afternoon as winds gusting up to 20 kilometres per hour dispersed some of the noxious haze that lingered over Delhi for around a week, even as the city's pollution level still remained in the 'severe' category.

The India Meteorological Department (IMD) said Cyclone Maha and a western disturbance will cause rainfall in parts of the northern plains, covering Rajasthan, Punjab, Haryana, western Uttar Pradesh and Delhi-NCR, on Wednesday and Thursday which will improve the situation further.

Though there was a significant, visible change in pollution levels on Monday, the national capital's air quality index (AQI) at 4 pm read 416, which is still in the 'severe' category, according to the Central Pollution Control Board (CPCB).

CPCB's former director Dipankar Saha said this is because the air quality index reading at any given time is an average of AQIs recorded in the previous 24 hours.

Weather experts said a significant increase in the wind speed dispersed the pollutants faster.

The cloud cover over Delhi and the neighbouring areas also dissipated, revealing the sun that caused the air close to the ground to rise up and flush out pollutants.

Kuldeep Srivastava, a senior scientist at the IMD, said, "The two main reasons for improvement in air quality are increased wind speed and no cloud cover."