Delhi's air quality has triggered GRAP Stage 4, the highest emergency level, as the Air Quality Index (AQI) crossed 600 due to severe smog, leading to bans on non-essential trucks, construction halts, and potential work-from-home orders, with authorities implementing strict curbs, impacting public health and demanding residents stay indoors and wear masks to combat the hazardous conditions.

Delhi's air quality has triggered GRAP Stage 4, the highest emergency level, as the Air Quality Index (AQI) crossed 600 due to severe smog, leading to bans on non-essential trucks, construction halts, and potential work-from-home orders, with authorities implementing strict curbs, impacting public health and demanding residents stay indoors and wear masks to combat the hazardous conditions. 
What's Happening:-

Severe Pollution: -
AQI levels are soaring past 600, indicating hazardous air, with heavy smog reducing visibility.
GRAP Stage 4 Activated: -
This triggers the strictest emergency measures under the Graded Response Action Plan (GRAP). 

Key Restrictions Under GRAP Stage 4:-
Vehicle Bans: -
Entry of heavy, non-essential vehicles from other states is banned; only those carrying essentials are allowed.
Construction Halted: -
All construction and demolition activities are stopped.
Industrial Curbs: -
Non-compliant industries face closure, with over 600 already sealed.
Work-From-Home: -
Authorities may mandate work-from-home, especially for government employees. 
Why It's Happening:
Weather Factors: -
Low wind speeds and temperature inversions trap pollutants.
Pollution Sources: -
A mix of vehicular emissions, industrial pollution, and crop stubble burning in nearby states. 
Health & Safety Advice:-
Avoid Outdoors: -
Stay indoors and keep windows shut.
Wear Masks: -
Use high-quality masks when stepping out.
Protect Vulnerable Groups:-
 Children, the elderly, and those with respiratory issues are at highest risk. 
What's Next:-
Authorities will monitor AQI, with further action possible if pollution persists. 
If you'd like, I can detail the specific impact on different types of vehicles and industries, or provide a comparison of AQI levels during previous GRAP Stage 4 activations.
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GRAP Stage-4 to be enacted in Delhi | DD News On Air - Newsonair

22 Dec 2025 — Under the GRAP-4, Entry of heavy vehicles from other states will be banned in Delhi. However, trucks carrying essential commodities and providing ess...

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20 Dec 2025 — As air quality in the national capital deteriorated to severe levels, the Government of Delhi intensified enforcement under GRAP Stage-IV.

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