Diwali 2026 was Delhi's fourth most polluted day with PM2.5 concentration of 257
GS3Economy · S&T · Environment · Security· Pollution (air, water, plastic)· Prelims + Mains·
Air quality management and the efficacy of green crackers: a GS3 Environment and Ecology case study.
Why in news
Dr Manoj Kumar of CREA revealed that Diwali 2026 was Delhi's fourth most polluted day with a PM2.5 concentration of 257, sparking debate over the efficacy of 'green crackers'.
Background
Delhi's PM2.5 concentration reached 257 on Diwali 2026, making it the fourth most polluted day of the year. The day also ranked as the fourth most polluted Diwali since 2016.
Facts for Prelims
- FactPM2.5 concentration on Diwali 2026 in Delhi was 257.
- BodyCREA: Centre for Research on Energy and Clean Air.
- S&TCSIR-NEERI framework requires green crackers to show a minimum 30% reduction in particulate matter compared to conventional variants.
- PlaceDelhi registered the pollution levels mentioned in the report.
Prelims practice question
What is the minimum required reduction in particulate matter for crackers to be classified as 'green' under the CSIR-NEERI framework?
- (a)10%
- (b)50%
- (c)30%
- (d)75%
Show answer
Answer: (c) 30% — The CSIR-NEERI framework requires green crackers to show a minimum 30% reduction in particulate matter compared to conventional variants.
For Mains
Q. Critically analyze the limitations of 'green crackers' in mitigating Delhi's winter air pollution crisis and suggest systemic measures to curb particulate matter.
Dimensions to cover in your answer
- Regulatory gap: Allegations of 'greenwashing' due to lack of strict enforcement and monitoring of emission thresholds.
- Multi-sectoral crisis: Interplay of festive emissions, vehicular pollution, construction dust, and stubble-burning residue.
- Technical limitation: Green crackers only target a 30% reduction rather than being pollution-free.
Keywords: PM2.5 concentration · Greenwashing · CSIR-NEERI · Particulate Matter · Air Quality Management
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- Diwali 2026 records 257 µg/m³ PM2.5, fourth most polluted since 2016 · 10 November 2026
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This note is generated automatically from SatyaDheesh's news feed and mapped to the UPSC CSE syllabus. Check facts against the original report or PIB before using them in an answer.