Delhi's Air Quality Index (AQI) stood at 484, the worst this season, at 8 am, according to the Central Pollution Control Board (CPCB)
The AQI was 441 at 4 pm on Sunday and rose to 457 by 7 pm due to unfavourable weather conditions
With the AQI crossing 450, the Commission for Air Quality Management in the National Capital Region and Adjoining Areas ordered the implementation of Graded Response Action Plan (GRAP) Stage-IV restrictions in Delhi-NCR
Non-essential light commercial vehicles registered outside Delhi will also be prohibited, except for EVs and CNG and BS-VI diesel ones
Delhi-registered BS-IV or older diesel medium and heavy goods vehicles are banned, except for those in essential services, the order said
All construction activities, including highways, roads, flyovers, power lines, pipelines and other public projects, have been suspended
An AQI of 400 or higher is deemed 'severe' and it can have an adverse effect on both healthy individuals and people who already have medical conditions
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