Here’s how the rules work under the re-imposed GRAPStage IV in Delhi-NCR ... This distinction between Delhi-registered and non-Delhi-registered BS4 petrol vehicles is relatively new ... Air Pollution Delhi Delhi's Air Quality.
NEWDELHI... The move bans entry of all non-Delhi registered vehicles below BS-VI emission norms into the city ... 'Ventilation index is likely to be 1,000 m2/s on Jan 18; 1,000 m2/s on Jan 19 and 4,500 m2/s on Jan 20 over Delhi ... Delhi AQI .