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Relevance: GS-II (Governance) | GS-III (Environment | Source: The Hindu

The Pan-India Deepavali Smog and the ‘Missing Data’ Controversy

The Context: While Delhi usually grabs the pollution headlines, CPCB data reveals that nearly 70% of monitoring stations across India choked on ‘severe’ air this Deepavali. Worse, when the air turned hyper-hazardous, government pollution monitors simply stopped recording data—exposing severe flaws in both ground enforcement and the country’s environmental transparency.

1. A Nationwide Chokehold: Tier-2 Cities Hit Hard

  • Widespread Spikes: Out of 551 reporting stations nationwide, 375 hit the ‘severe’ PM2.5 mark (250 µg/m³ or above), a massive jump from just 96 stations before the festival.
  • Tier-2 Vulnerability: The crisis is not confined to state capitals. Industrial and agricultural hubs like Kaithal and Sirsa (Haryana), Ludhiana (Punjab), and Dholpur (Rajasthan) recorded some of the highest PM2.5 readings in the country.

2. The Data Gap Mystery and Green Cracker Illusions

  • Machines Maxing Out: Right when pollution peaked, many stations went blank. The CPCB admitted that its sensors are capped at 1,000 µg/m³. When pollution crosses this hyper-hazardous line, the automated system rejects the reading, creating a “data gap” precisely when citizens breathe the worst air.
  • The Tamil Nadu Blackout: Tamil Nadu stood out for a massive data void—out of its 37 stations, only 9 actually reported PM2.5 levels during the critical hourly windows.
  • Green Crackers Failing to Deliver: The push for eco-friendly ‘green crackers’ was meant to drastically cut Sulphur Dioxide (SO2). However, readings in Delhi, Mumbai, and Kolkata show absolutely no drop in SO2 over the last five years, proving traditional toxic fireworks still dominate the market.

Value Box: Environmental Institutions & Standards
CPCB Origins The Central Pollution Control Board is a statutory body created under the Water Act, 1974, and later given powers under the Air Act, 1981 to regulate national air quality.
CAAQMS & NAQI The Continuous Ambient Air Quality Monitoring Stations provide real-time data to calculate the National Air Quality Index (NAQI), which tracks 8 core pollutants (PM10, PM2.5, NO2, SO2, CO, O3, NH3, and Pb).
Green Crackers Developed by CSIR-NEERI (brands like SWAS, SAFAL, STAR). They eliminate banned chemicals like barium nitrate and use additives to suppress dust, aiming to cut emissions by 30%.

Practice MCQ

Q. Consider the following statements regarding India’s air quality monitoring frameworks:

  1. The Central Pollution Control Board (CPCB) was originally established as a statutory organisation under the Air (Prevention and Control of Pollution) Act, 1981.
  2. The National Air Quality Index (NAQI) simplifies complex air quality data into a single number based on the measurement of exactly eight core pollutants.

Which of the statements given above is/are correct?

(a) 1 only     (b) 2 only     (c) Both 1 and 2     (d) Neither 1 nor 2

Answer: (b) 2 only
Hint: Statement 1 is incorrect because the CPCB was originally established under the Water (Prevention and Control of Pollution) Act, 1974 (it was later entrusted with powers under the Air Act of 1981). Statement 2 is correct; the NAQI relies on 8 specific core pollutants.
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