World’s Most and Least Polluted Countries (IQAir Report 2024-25)
Analysis:
- Global Air Pollution Context
- Air pollution remains a major environmental health risk globally, contributing to one in nine deaths annually, according to the World Health Organization (WHO).
- PM2.5 (Particulate Matter ≤2.5 micrometers) is the most harmful pollutant as it penetrates deep into lungs and bloodstream.
- Exposure is linked to heart disease, asthma, cancer, respiratory illnesses, and developmental disorders in children.
- Global Pollution Pattern
- South Asia and parts of Africa dominate the list of the most polluted countries.
- Key drivers include:
- Rapid urbanisation
- Industrial emissions
- Vehicular pollution
- Biomass burning
- Climatic and geographical conditions that trap pollutants.
- India’s Position
- Rank: 5th most polluted country globally in 2024.
- Average PM2.5 concentration: 50.6 µg/m³.
- Improvement: Reduced from 54.4 µg/m³ in 2023, resulting in India moving from 3rd to 5th position.
- Top 10 Most Polluted Countries (2024)
| Rank | Country | PM2.5 (µg/m³) |
|---|
| 1 | Chad | 91.8 |
| 2 | Bangladesh | 78 |
| 3 | Pakistan | 73.7 |
| 4 | Democratic Republic of the Congo | 58.2 |
| 5 | India | 50.6 |
| 6 | Tajikistan | 46.3 |
| 7 | Nepal | 42.8 |
| 8 | Uganda | 41 |
| 9 | Rwanda | 40.8 |
| 10 | Burundi | 40.3 |
- Top 10 Least Polluted Countries (2024)
| Rank | Country | PM2.5 (µg/m³) |
|---|
| 1 | Bahamas | 2.3 |
| 2 | French Polynesia | 2.5 |
| 3 | Barbados | 3.1 |
| 4 | Grenada | 3.2 |
| 5 | Iceland | 4 |
| 6 | New Zealand | 4.4 |
| 7 | Australia | 4.5 |
| 8 | Estonia | 4.6 |
| 9 | Finland | 5.2 |
| 10 | Sweden | 5.3 |
- Key Observations
- South Asian countries dominate the most polluted list.
- Nordic countries dominate the cleanest list due to strong environmental governance and sustainable energy systems.
- Island nations such as Bahamas and Barbados benefit from low industrialisation and strong oceanic air circulation.
Static / Background Information
- PM2.5 (Particulate Matter 2.5):
- Airborne particles with diameter ≤2.5 micrometers.
- Considered the most dangerous air pollutant due to its ability to penetrate lungs and bloodstream.
- WHO Air Quality Guideline
- Recommended annual PM2.5 limit: 5 µg/m³.
- Major Sources of PM2.5
- Vehicle emissions
- Industrial activities
- Coal-based power plants
- Agricultural residue burning
- Construction dust
- Biomass burning
- Global Monitoring
- Air pollution rankings are compiled using ground monitoring stations and satellite data.
Updated - 09 May 2025 ; 07:15 PM | News Source: The Indian Express