On Diwali 2025 (October 20), Delhi recorded an AQI of 344 (Very Poor) that rose to a peak of 451 (Severe) by the following morning. Low wind speeds of 5 km/h trapped PM2.5 particles from fireworks. The CPCB reported a national average AQI of approximately 280. Haryana recorded 402 (Severe), Uttar Pradesh 350 (Very Poor), and Punjab 320 (Very Poor). Delhi's October 2025 AQI was rated the worst in three years. Despite the Supreme Court's recurring green-cracker guidelines and state bans, enforcement remained weak, reigniting the annual debate over balancing cultural traditions with the constitutional Right to Life under Article 21.
Diwali 2025: Delhi AQI Hits 344 (Very Poor) on October 20 — Worst in Three Years
AQuick answer
On Diwali 2025 (October 20), Delhi recorded an AQI of 344 (Very Poor) that rose to a peak of 451 (Severe) by the following morning. Low wind speeds of 5 km/h trapped PM2.5 particles from fireworks. The CPCB reported a national average AQI of approximately 280. Haryana recorded 402 (Severe), Uttar Pradesh 350 (Very Poor), and Punjab 320 (Very Poor). Delhi's October 2025 AQI was rated the worst in three years. Despite the Supreme Court's recurring green-cracker guidelines and state bans, enforcement remained weak, reigniting the annual debate over balancing cultural traditions with the constitutional Right to Life under Article 21.
Key facts
- Delhi's AQI hit 344 (Very Poor) on Diwali 2025 (October 20) and peaked at 451 (Severe) the next morning.
- Low wind speeds of 5 km/h trapped PM2.5 particles from fireworks across the city.
- Haryana recorded AQI 402 (Severe), UP 350 (Very Poor) and Punjab 320 (Very Poor).
- Delhi's October 2025 AQI was the worst in three years despite green-cracker guidelines.
- The CPCB reported a national average AQI of approximately 280 around Diwali.
- The incident reignited the debate on balancing cultural traditions with Article 21's Right to Life.
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CoverageNationalSubjectScience & TechnologyExamBasic Computer Instructor · CET Graduation · CET Senior Secondary · EO/RO · LDC · Mahila Supervisor · Patwar · PTI · RAS · REET · RPSC SI · School Lecturer · Senior Computer Instructor · Senior Teacher · UPSC · Vanpal · BothSourceAQI.IN / Al Jazeera / CNN / CPCB
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Source: AQI.IN / Al Jazeera / CNN / CPCB
Frequently asked questions
What was Delhi's AQI on Diwali 2025 and how did it compare to previous years?
Delhi recorded an AQI of 344 (Very Poor) on Diwali 2025 (October 20), which peaked at 451 (Severe) the following morning. This was the worst October AQI in three years, underscoring the persistent failure of enforcement measures around fireworks.
What are the AQI categories defined by CPCB, and what health risks do they carry?
CPCB defines six AQI categories: Good (0-50), Satisfactory (51-100), Moderate (101-200), Poor (201-300), Very Poor (301-400), and Severe (401-500). Very Poor AQI causes respiratory illness on prolonged exposure; Severe AQI affects healthy individuals and seriously impacts those with existing conditions.
What meteorological factor aggravated Delhi's air quality during Diwali 2025?
Wind speeds of only 5 km/h during Diwali 2025 created near-stagnant air conditions that trapped PM2.5 particles from fireworks close to the ground, preventing dispersal and causing rapid AQI deterioration overnight.
How does Diwali pollution intersect with Article 21 of the Constitution?
The Supreme Court has held in multiple judgments that the Right to Life under Article 21 includes the right to a clean environment. Diwali pollution — which pushes AQI to Severe levels — directly threatens this right. Courts have therefore upheld partial or full cracker bans despite arguments about cultural freedom under Article 25.
What is PM2.5 and why is it particularly dangerous compared to PM10?
PM2.5 refers to particulate matter with diameter ≤ 2.5 micrometres. Unlike PM10 (≤ 10 micrometres), PM2.5 bypasses the nasal filter, penetrates deep into the alveoli of the lungs, and can enter the bloodstream, causing cardiovascular and pulmonary diseases. Fireworks are a major source of PM2.5 spikes during festive seasons.
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