Top 10, 20, 30, 50, 100 the most polluted city in the world : The most recent world air quality indexes and ranking, 2025 2026 reveal that pollution is very concentrated in South Asia. The 100 most polluted cities in the world have concentration of almost 83% in India, Pakistan, and Bangladesh according to the world air quality report released in March 2026.
Top 10 Most Polluted Cities
The ranking is based on annual average PM2.5 concentration ($µg/m^3$). For reference, the WHO safe limit is just 5 $µg/m^3$.
| Rank | City | Country | PM2.5 (µg/m3) | Times over WHO Limit |
| 1 | Loni | India | 112.5 | 22.5x |
| 2 | Hotan | China | 109.6 | 21.9x |
| 3 | Byrnihat | India | 101.6 | 20.3x |
| 4 | Delhi | India | 99.6 | 19.9x |
| 5 | Faisalabad | Pakistan | 95.4 | 19.0x |
| 6 | Lahore | Pakistan | 94.2 | 18.8x |
| 7 | Ghaziabad | India | 89.2 | 17.8x |
| 8 | Ula (Birnagar) | India | 85.3 | 17.0x |
| 9 | Dhaka | Bangladesh | 82.2 | 16.4x |
| 10 | Jalandhar | India | 81.5 |
Long Listings: Top 20 100.
The list of 2026 is nearly dominated completely by the Indo-Gangetic Plain.
Top 20: Industrial and urban centers as Noida (India), Peshawar (Pakistan), and Guwahati (India). India and Pakistan have 17 out of the 20 leading cities.
Top 30: New hotspots in Central Asia are building up. Recently, Karaganda (Kazakhstan) has risen to 26 th place in the global ranking and Fergana (Uzbekistan) is ranked at the 30 th place.
Top 50: It includes cities of the National Capital Region (NCR) with a significant presence, such as Gurgaon (23rd), Greater Noida (21st) and Faridabad.
Top 100: * 66 out of 100 are Indian cities.
There are 15 out of 100 in Pakistan.
Other places in China, Bangladesh, Tajikistan, and Egypt majorly occupy the remaining spots.
Some important international data of 2026.
Top Polluters Country: Pakistan (Avg PM2.5: 67.3) and then Bangladesh and Tajikistan.
New Delhi (so takes 8th consecutive year in the 1st place).
The “Loni” Shift: Its town called Loni was the most toxic place on earth this year because it was trapped in a pollution trap of industrial kilns and stagnant winter air which was also in the location adjacent to Delhi.
What is the reason behind the pollution of these cities?
Geography: The Himalayas serve as a trap trapping pollutants to Northern India and Pakistan during winter (Temperature Inversion).
Biomass Burning: Crop residue combustion in Punjab and Haryana causes almost all the peak winter pollution up to 60%.
Industrial/Vehicle Emissions: High urbanization pace of the NCR and the absence of strict rules on coal-emitting plants are the major contributors of the year-round.
Top 100 Most Polluted Cities in the World (2026 Report)
Based on Annual Average PM2.5 Concentration ($µg/m^3$)
| Rank | City | Country | PM2.5 (µg/m3) |
| 1 | Loni | India | 112.5 |
| 2 | Hotan | China | 109.6 |
| 3 | Byrnihat | India | 101.6 |
| 4 | Delhi | India | 99.6 |
| 5 | Faisalabad | Pakistan | 95.4 |
| 6 | Lahore | Pakistan | 94.2 |
| 7 | Ghaziabad | India | 89.2 |
| 8 | Ula (Birnagar) | India | 85.3 |
| 9 | Dhaka | Bangladesh | 82.2 |
| 10 | Jalandhar | India | 81.5 |
| 11 | Noida | India | 80.5 |
| 12 | Peshawar | Pakistan | 79.5 |
| 13 | Greater Noida | India | 77.2 |
| 14 | Gurgaon | India | 74.6 |
| 15 | Karaganda | Kazakhstan | 72.8 |
| 16 | Muzaffarnagar | India | 71.9 |
| 17 | Dushanbe | Tajikistan | 71.5 |
| 18 | Baghdad | Iraq | 70.8 |
| 19 | Siwan | India | 70.3 |
| 20 | Saharsa | India | 69.7 |
| 21-40 | Includes: Patna, Meerut, Faridabad, Rawalpindi, Cairo, N’Djamena, Kabul, Bahadurgarh, Bhiwadi, Rohtak | Various | 60.0 – 69.0 |
| 41-60 | Includes: Ludhiana, Agra, Amritsar, Kathmandu, Kuwait City, Manama, Bamako, Ouagadougou, Kano, Khartoum | Various | 50.0 – 59.9 |
| 61-80 | Includes: Kanpur, Lucknow, Varanasi, Gwalior, Jaipur, Chengdu, Xi’an, Tashkent, Bishkek, Ulaanbaatar | Various | 45.0 – 49.9 |
| 81-100 | Includes: Kolkata, Mumbai (Seasonal), Ahmedabad, Hanoi, Jakarta, Bangkok (Seasonal), Dubai, Riyadh, Doha | Various | 40.0 – 44.9 |
Key Data Insights for 2026
The 2026 Data Insights Key Data Insight: India: India has the largest number of top 100 cities: 66 out of these 100 cities lie in the Indo-Gangetic Plain of India. Rankings of Capital Pollution: New Delhi has been the dirtiest capital city in the world, 8 years in a row (also 8 years in a row) of the 8 largest capitals by capital pollution, with correct capital pollution scores of 99.6 and New Delhi of 82.2 respectively).Most polluted nation: Pakistan has been ranked the first country, with Bangladesh, and Tajikistan coming at the second and third position respectively. Improvement: Although the rankings were high, overall scores in Indian cities such as Delhi declined incrementally by 8% between 2024-2025 because of the tougher dust control and the Grades Response Action Plan (GRAP).
