Delhi's air quality slips to 'moderate' at 197; Anand Vihar, RK Puram record 'poor' AQI

As per AQI classification, a reading between 0 and 50 is considered 'good', 51 to 100 'satisfactory', 101 to 200 'moderate', 201 to 300 'poor', 301 to 400 'very poor', and 401 to 500 'severe'