Delhi breathed easier on Thursday morning as pollution levels dropped further due to moderate wind speed. The air quality index in the Capital dropped to 235 at 6:30 am. The Ministry of Earth Sciences' air quality monitor, SAFAR, said, 'The AQI(Air Quality Index) is back to 'poor'(means lower pollution) category due to a change in the wind direction. Safar added that the share of stubble burning in Delhi's pollution dropped to a meagre 3 per cent.
SAFAR said, "A change in the wind direction has led to a very low biomass plume intrusion in spite of the fact that the fire count observed yesterday was very high."
Delhi's overall air quality index improved significantly (from very poor to poor) on Thursday, more rapidly than predicted. The PM 2.5 (refers to atmospheric particulate matter (PM) that have a diameter of less than 2.5 micrometers, which is about 3% the diameter of a human hair that can enter into the lungs and even the bloodstream) started dropping in the morning.
Gurgaon recorded 'moderate' AQI, while Faridabad, Noida and Ghaziabad recorded 'poor' overall air quality.
An AQI between 0-50 is considered good, 51-100 satisfactory, 101-200 moderate, 201-300 poor, 301-400 very poor, and 401-500 severe. Above 500 is severe-plus emergency category.