Delhi's October Air Quality Second-Best Since 2015, Courtesy Prolonged Rainfall

Delhi Air Quality: Delhi recorded an average air quality index of 210, the best in the month after the average AQI of 173 recorded in October last year.

A prolonged spell of rain in early October gave Delhi its second-best air quality in the month since 2015, when the Central Pollution Control Board started maintaining air quality index data.

The capital recorded an average air quality index of 210, the best in the month after the average AQI of 173 recorded in October last year.

The average AQI stood at 265 in 2020, 234 in 2019, 268 in 2018, 285 in 2017, 271 in 2016 and 264 in 2015.

"Air quality deterioration is seasonal in our country. This is because of the intrusion of dust from neighbouring countries. Low wind speed leads to accumulation of pollutants. Stubble burning, excessive use of vehicles and construction work aid in accumulation of pollutants.