Top 100 Polluted Cities in the World 2026, Delhi AQI Rankings

Top 100 Polluted Cities in the World 2026 rankings highlight the growing air pollution crisis, particularly in India. According to latest information as on 9 November 2026, India accounted for as many as 99 of the world’s 100 most polluted cities in one morning snapshot, following Diwali celebrations. Cities in Punjab, Haryana, Rajasthan and Uttar Pradesh recorded extremely high Air Quality Index (AQI) levels, raising serious concerns about public health, environmental protection and air pollution control. 

Top 10 Most Polluted Cities in the World

The world’s most polluted cities in November 2026 were largely concentrated in northern India, where hazardous air quality was reported following Diwali and during the crop-residue burning season. According to the latest information as on 9 November 2026, the top 10 cities were:

• Northern India’s Dominance: Nine of the top 10 cities were located in India, mainly in Punjab, Haryana, Rajasthan and Uttar Pradesh.
• Highest Pollution Level: Sri Ganganagar, Rajasthan, recorded the highest AQI of 868, followed by Faridkot (842) and Bathinda (797).
• Pakistan’s Position: Lahore was the only city outside India among the top 10, ranking ninth with an AQI of 446.
• New Delhi’s Ranking: New Delhi ranked 15th, with an AQI of 380 in this particular snapshot.

Which Country Has the Most Polluted Cities in the World?

India accounted for the largest number of cities in the world’s most polluted cities rankings in November 2026, reflecting severe air pollution across the country, particularly in northern states.

• India’s Global Dominance: Following Diwali in 2026, 99 of the world’s 100 most polluted cities were reported to be in India, with Lahore, Pakistan, being the only city outside India in that ranking.
• Changing Pollution Rankings: Other rankings reported 93 Indian cities among the world’s 100 most polluted, showing that pollution levels vary with weather conditions and emissions.
• Most Affected States: Punjab, Haryana, Uttar Pradesh and Rajasthan recorded particularly high pollution levels due to vehicular emissions, industrial activities, crop burning and seasonal weather conditions.
• Seasonal Pollution: Air pollution generally worsens during October-January because of lower temperatures, weak winds, temperature inversions and additional seasonal emissions.

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India’s Position Among the World’s Most Polluted Cities

India’s position in the global air pollution rankings of 2026 reflects worsening urban air quality, particularly following Diwali celebrations and during the winter season.

• High Global Representation: India accounted for approximately 93-99 cities among the world’s 100 most polluted locations in different rankings during November 2026.
• Punjab’s Pollution Crisis: Bathinda and Faridkot recorded some of the highest AQI levels, with readings exceeding 800 in certain reports.
• Delhi’s Air Pollution: New Delhi recorded extremely high AQI levels, reflecting the impact of vehicular emissions, construction dust, industrial pollution and seasonal conditions.
• Pollution Beyond Northern India: Cities such as Bhopal, Pune, Patna, Rajkot and Bhubaneswar also reported elevated pollution levels, indicating that the problem extends beyond Delhi-NCR.
• AQI Classification: The Central Pollution Control Board (CPCB) classifies AQI from 0 to 500, with 401-500 considered severe. Some international monitoring platforms report values exceeding 500 and classify them as hazardous.

Causes of India’s Rising Air Pollution in Cities

Air pollution in Indian cities results from multiple human activities and seasonal factors. Major pollutants include PM2.5, PM10, nitrogen dioxide (NO₂), carbon monoxide (CO), sulphur dioxide (SO₂) and ground-level ozone (O₃).

• Vehicular Emissions: Increasing numbers of petrol and diesel vehicles release particulate matter, nitrogen oxides and other harmful pollutants, contributing significantly to urban air pollution.
• Industrial and Power Plant Emissions: Thermal power plants, factories, brick kilns and small-scale industries release smoke, particulate matter and harmful gases through fossil fuel combustion.
• Stubble Burning: The burning of crop residues in Punjab, Haryana and Uttar Pradesh contributes to seasonal pollution, particularly during the post-harvest period.
• Construction and Road Dust: Construction activities, unpaved roads and dust raised by moving vehicles increase particulate matter concentrations in urban areas.
• Firecrackers and Waste Burning: Diwali fireworks, open garbage burning and landfill fires can cause sharp increases in pollution levels.
• Household Fuel Burning: Burning wood, coal, biomass and other solid fuels for cooking and heating releases harmful particles and gases.
• Unfavourable Winter Weather: Low wind speeds, temperature inversions and reduced atmospheric mixing trap pollutants near the ground, worsening air quality.
• Diesel Generator Sets: Diesel generators used for backup electricity contribute additional particulate matter and nitrogen oxide emissions.

Health and Environmental Impacts of Air Pollution

Air pollution is a major public health and environmental concern, affecting human health, ecosystems, agricultural productivity and economic growth.

• Respiratory Diseases: Exposure to PM2.5, PM10 and other pollutants increases the risk of asthma, bronchitis, chronic obstructive pulmonary disease (COPD) and other respiratory illnesses.
• Cardiovascular Problems: Long-term exposure can contribute to heart disease, stroke and high blood pressure, particularly among vulnerable populations.
• Premature Deaths: According to the State of Global Air Report 2024, air pollution was associated with more than 2 million deaths annually in India, highlighting its serious health burden.
• Impact on Vulnerable Groups: Children, elderly people, pregnant women and individuals with existing illnesses face greater health risks from prolonged pollution exposure.
• Environmental Damage: Air pollutants contribute to smog formation, acid deposition, reduced visibility and damage to natural ecosystems.
• Agricultural Losses: Ground-level ozone and other pollutants can damage crops and vegetation, reducing agricultural productivity.
• Economic Losses: According to a Clean Air Fund-supported economic analysis, India could have gained approximately USD 95 billion in GDP in 2019 if safe air quality levels had been achieved, through higher productivity and reduced health-related losses.

Global Initiatives to Reduce Air Pollution

Several international organisations and global initiatives are working to reduce air pollution through cleaner technologies, stricter emission standards, improved monitoring and international cooperation.

• WHO Global Air Quality Guidelines (2021): The World Health Organization (WHO) recommends an annual average PM2.5 concentration of 5 µg/m³ to reduce health risks from air pollution.
• United Nations Environment Programme (UNEP): Supports countries in improving air quality management, pollution monitoring and environmental policies, while promoting cleaner energy and sustainable development.
• Climate and Clean Air Coalition (CCAC): Established in 2012, this international partnership works to reduce short-lived climate pollutants, including methane, black carbon, hydrofluorocarbons and ground-level ozone.
• Sustainable Development Goals (SDGs): Under the UN 2030 Agenda, SDG 3 (Good Health and Well-being) and SDG 11 (Sustainable Cities and Communities) include targets related to reducing the health and environmental impacts of air pollution.
• Paris Agreement (2015): Encourages clean energy transitions and lower greenhouse gas emissions, which can also help reduce harmful air pollutants.
• International Day of Clean Air for Blue Skies: Observed annually on 7 September, this UN initiative promotes public awareness and international cooperation to improve air quality.

Measures to Control Air Pollution in India

The Government of India has introduced several programmes and regulatory measures to reduce urban air pollution, strengthen monitoring systems and promote cleaner technologies.

• National Clean Air Programme (NCAP): Launched in January 2019 by the Ministry of Environment, Forest and Climate Change (MoEFCC) to improve air quality in Indian cities.
  • Its revised target is to achieve up to a 40% reduction in PM10 concentrations by 2025-26, compared with the 2017-18 baseline, or meet national standards.
  • City-specific Clean Air Action Plans focus on reducing pollution from vehicles, industries, road dust, construction and waste burning.
• Graded Response Action Plan (GRAP): Implemented in Delhi-NCR by the Commission for Air Quality Management (CAQM) to introduce restrictions based on AQI levels and pollution forecasts.
  • Measures include restrictions on polluting vehicles, construction activities, industrial emissions and other pollution-generating activities during severe pollution episodes.
• Bharat Stage-VI (BS-VI) Emission Standards: Introduced nationwide in April 2020 to reduce harmful pollutants from vehicles through stricter fuel and emission standards.
• Promotion of Electric Vehicles: Government initiatives, including the FAME-II scheme, have supported the adoption of electric and hybrid vehicles to reduce dependence on petrol and diesel.
• Control of Stubble Burning: The government provides assistance for crop-residue management machinery, custom hiring centres and paddy-straw processing plants, helping farmers manage agricultural waste without burning it.
• Industrial Emission Control: Measures include stricter emission standards for thermal power plants and industries, cleaner fuel requirements and Online Continuous Emission Monitoring Systems (OCEMS) for highly polluting industrial units.
• Improved Air Quality Monitoring: The Central Pollution Control Board (CPCB) operates air quality monitoring systems and publishes AQI bulletins to provide information about pollution levels and support timely action.
• Dust and Waste Management: Measures include mechanised road sweeping, dust suppression, anti-smog guns, construction-site inspections and improved solid-waste management to reduce particulate pollution.
• Public Awareness and Participation: Initiatives such as the SAMEER app, public complaint systems and awareness campaigns encourage citizens to report pollution and adopt cleaner practices.
• Strengthening Regional Coordination: Greater cooperation among the Central Government, State Governments, CPCB, CAQM and urban local bodies is essential because air pollution often spreads beyond city and state boundaries.