Delhi's air quality continues to remain in 'severe' category for the third consecutive day with Air Quality Index (AQI) standing at 432 on Monday, System of Air Quality and Weather Forecasting and Research (SAFAR) stated. At 6 am, the PM10 and PM2.5 concentration stood at 423 and 282, respectively. Noida's air quality continues to remain 'severe' with AQI at 575.