Delhi’s air quality remained ‘severe’ for the second day on Thursday, 12 December, with most localities recording an AQI of over 400 according to the Central Pollution Control Board (CPCB) and India Meterological Department (IMD) data.The national capital saw an aggregate AQI of severe 408 on Wednesday. It had been in the ‘very poor’ category for the past five days. Noida and Gurgaon also witnessed AQIs of over 400 on Thursday.However, the IMD predicts rain and fast winds for Thursday and Friday in the national capital region, which may bring the pollution levels down again.Delhi Pollution Anyway Killing Me: Nirbhaya Convict in Review PleaDelhi had seen dramatic improvement in the air quality during the last week of November as the AQI had reached 'satisfactory' category after seeing several days of ‘severe’.There are six AQI categories according to the CPCB:Good (0-50): Minimal impactSatisfactory (51-100): Minor breathing discomfort to sensitive peopleModerate (101-200): Breathing discomfort to the people with lungs, asthma and heart diseasesPoor (201-300): Breathing discomfort to most people on prolonged exposureVery Poor (301-400): Respiratory illness on prolonged exposureSevere (401-500): Affects healthy people and seriously impacts those with existing diseasesSC Allows Railways to Cut Over 450 Trees for Delhi-Agra Track We'll get through this! Meanwhile, here's all you need to know about the Coronavirus outbreak to keep yourself safe, informed, and updated. The Quint is now available on Telegram & WhatsApp too, Click here to join.