Pollution from winter waste burning in cities three times higher than summer, study finds
2-minute summary
A study by the World Resources Institute (WRI) India (2019-2026) across 11 Indian cities reveals that open waste burning increases threefold during winter compared to summer in terms of incidence, quantity, and emissions. While open burning contributes less than 1% of overall citywide PM2.5 and PM10, its proximity to households causes high localized exposure to toxic smoke. Tier 2 cities (population 0.5 to 5 million) burn the largest absolute quantities of waste, while Tier 3 cities experience the highest winter incidence (49.6 incidents/sq km/day). The study highlights a stark socio-economic divide: low-income areas suffer significantly higher burning rates due to inadequate municipal waste collection. The winter surge is driven by meteorological factors like temperature inversions and weak winds, alongside the practice of burning paper and plastic waste for warmth. In response, the Commission for Air Quality Management (CAQM) has initiated targeted measures under 'Operation Clean Air' to identify waste-sensitive sites and provide alternative heating facilities for outdoor workers.
Why it's in the news
A long-term study (2019-2026) by WRI India has highlighted that winter waste burning in Indian cities is three times higher than in summer, exposing critical gaps in urban solid waste management and seasonal pollution control strategies.
Background and context
Municipal Solid Waste Management (MSWM) remains a persistent challenge in rapidly urbanizing Indian cities. Although the Solid Waste Management Rules, 2016 strictly prohibit the open burning of municipal solid waste, enforcement remains weak, especially in Tier 2 and Tier 3 cities. During winter, the Indo-Gangetic Plain and other urban basins experience meteorological phenomena such as temperature inversions—where a layer of warm air traps cooler air and pollutants close to the ground—and low wind speeds. This drastically reduces the dispersion of pollutants. Consequently, localized emissions from open waste burning, which is often resorted to by urban poor and outdoor workers for warmth due to the lack of shelter and heating facilities, lead to severe public health hazards.
Constitutional provisions
- Article 21 — Interpreted by the Supreme Court to include the right to a clean, healthy, and pollution-free environment as part of the right to life.
- Article 48A — Directive Principle of State Policy directing the State to endeavor to protect and improve the environment.
- Article 243W read with the 12th Schedule — Powers, authority, and responsibilities of Municipalities, explicitly listing public health, sanitation, conservancy, and solid waste management as municipal functions.
Committees and reports
- WRI India Working Paper on Open Waste Burning (2026) — Provides empirical evidence on the seasonal variations, socio-economic disparities, and tier-wise distribution of open waste burning in Indian cities.
Government schemes
- Swachh Bharat Mission-Urban (SBM-U) 2.0 — Focuses on making cities completely 'garbage-free', ensuring 100% source segregation, scientific processing of municipal solid waste, and remediation of legacy dumpsites.
- National Clean Air Programme (NCAP) — Aims to achieve a 20% to 30% reduction in particulate matter concentrations in non-attainment cities, where localized waste burning is a key target area.
International organisations
- World Resources Institute (WRI) — A global research non-profit organization that conducts independent studies to promote environmental sustainability and economic opportunity.
Previous UPSC questions on this theme
- Mains GS-3 2018 — What are the impediments in disposing the huge quantities of discarded solid wastes which are continuously being generated? How do we remove safely the toxic wastes that have been accumulating in our habitable environment?
- Mains GS-3 2020 — What are the key features of the National Clean Air Programme (NCAP) initiated by the Government of India?
Mains practice: Analyze the socio-economic and meteorological factors that lead to a spike in localized air pollution in Indian cities during winter. Suggest policy measures to address this challenge.
A recent study by the World Resources Institute (WRI) India highlights that urban open waste burning is three times higher in winter than in summer. While it contributes less than 1% of citywide PM2.5, it creates severe localized health hazards due to its proximity to residential areas.
### Meteorological Factors Exacerbating Winter Pollution
• **Temperature Inversion:** During winter, ground-level air cools rapidly, trapping a layer of warm air above it. This prevents the vertical mixing of air, keeping toxic smoke from waste burning close to the ground.
• **Weaker Wind Speeds:** Stagnant atmospheric conditions post-monsoon reduce the horizontal dispersion of particulate matter, leading to localized pollution hotspots.
### Socio-Economic Factors
• **Heating Requirements:** Vulnerable populations, including the urban poor, security guards, and municipal workers, lack adequate shelter and heating facilities. They resort to burning paper, dry leaves, and plastic waste for warmth.
• **Municipal Disparities:** Low-income neighborhoods in Tier 2 and Tier 3 cities suffer from irregular waste collection services. Accumulated waste piles are frequently burned as a cheap disposal method.
• **Infrastructural Deficits:** Tier 2 and Tier 3 cities often lack the processing capacity to handle municipal solid waste, leading to informal dumping and subsequent burning.
### Policy Measures Required
• **Equitable Waste Collection:** Strengthen municipal services under Swachh Bharat Mission 2.0, prioritizing low-income and informal settlements to prevent waste accumulation.
• **Alternative Heating Facilities:** As recommended by the Union Environment Ministry, urban local bodies must provide dedicated heating facilities or green heaters to outdoor and night-shift workers.
• **Strict Enforcement and Monitoring:** Scale up the Commission for Air Quality Management’s (CAQM) 'Operation Clean Air' model, identifying 'waste-sensitive' sites and utilizing remote sensing/drones to enforce a zero-tolerance policy on open burning.
• **Public Awareness:** Conduct targeted campaigns to educate communities on the toxic health hazards of burning plastics and synthetic materials.
In conclusion, addressing winter air pollution requires transitioning from reactive emergency measures to proactive, decentralized municipal governance that integrates environmental justice with robust waste management infrastructure.
Prelims practice questions
Q1. With reference to the Commission for Air Quality Management (CAQM), consider the following statements: 1. It is a statutory body established under the Environment (Protection) Act, 1986. 2. Its jurisdiction extends over the National Capital Region (NCR) and adjoining areas. 3. It has the power to issue directions and entertain complaints regarding air pollution in its jurisdiction. Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Answer: B. Statement 1 is incorrect: CAQM is a statutory body established under a dedicated Act—the Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021 (not the EPA 1986). Statements 2 and 3 are correct as it has exclusive jurisdiction over NCR and adjoining areas (Punjab, Haryana, Rajasthan, UP) and possesses wide-ranging powers to issue directions, receive complaints, and regulate air quality.
Q2. Which of the following best describes the phenomenon of 'Temperature Inversion' often observed during winter in northern India?
- The sudden drop in temperature due to heavy post-monsoon rainfall.
- An increase in temperature with an increase in altitude near the Earth's surface.
- The rapid lateral movement of cold air masses over warm water bodies.
- A decrease in temperature with an increase in altitude.
Answer: B. Under normal conditions, temperature decreases with altitude. However, during a temperature inversion, a layer of warm air lies over a layer of cooler air near the ground (temperature increases with altitude). This stable air layer prevents vertical mixing and traps pollutants close to the surface.
Q3. According to the Solid Waste Management Rules, 2016 in India, which of the following statements is/are correct? 1. The rules make source segregation of waste mandatory for waste generators. 2. The rules explicitly prohibit the open burning of municipal solid waste. 3. The rules apply only to municipal areas and exclude census towns and defense establishments. Select the correct answer using the code given below:
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Answer: A. Statements 1 and 2 are correct: Source segregation is mandatory, and open burning of waste is strictly prohibited. Statement 3 is incorrect: The SWM Rules, 2016 have an extended jurisdiction beyond municipal areas, applying to urban agglomerations, census towns, notified industrial townships, areas under Indian Railways, airports, defense establishments, and places of religious/historical importance.
Revision flashcards
- What is the primary meteorological reason why urban air pollution worsens during winter in India? Temperature inversion (warm air trapping cold air and pollutants near the ground) combined with low wind speeds, which restrict the dispersion of emissions.
- According to the WRI India study (2019-2026), which city tier had the highest winter incidence of open waste burning? Tier 3 cities recorded the highest winter incidence (49.6 incidents per sq km/day), whereas Tier 2 cities burned the highest absolute quantity of waste.
- Why is open waste burning highly hazardous to health even though it contributes less than 1% of total citywide PM2.5? Because it occurs at ground level directly in neighborhoods, streets, and dumps, causing high localized, short-term exposure to toxic smoke.
- Under which Act was the Commission for Air Quality Management (CAQM) established? The Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021.
- What is CAQM's 'Operation Clean Air' initiative targeting? It targets open waste burning in the NCR by identifying waste-sensitive sites, training workers, conducting public awareness, and ensuring zero-tolerance enforcement.