The air pollution level is quantified by PM2.5 which are minute particles less than 2.5microns. These particles are not safe if they are introduced to the lungs and blood.
The World Health Organization (WHO) considers the PM2.5 level of 5 ug/m2 as safe. This limit is however well surpassed by most of the countries.
Which is the Most Polluted Country in the World?
As per the report from IQ Air, Pakistan is leading in air pollution index with the recent global air quality report indicating that the country has the highest pollutant levels in the world.
In Pakistan, PM 2.5 is 13 times higher than the WHO limit.
This implies that the pollutants can reach the level of exceeding 65 μg/m³ and beyond which is regarded as very unhealthy. The exact μg/m³ concentration in Pakistan is 67.3 as per the report.
Key Data About Global Air Pollution
The following are significant worldwide facts according to WHO and State of Global Air Organisation:
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99 percent of the world’s population is living in the places where levels of air pollution exceed WHO guidelines.
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About 2.6 billion people around the world are exposed to extreme levels of pollution.
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There were 67 million fatalities in 2019 due to exposure to pollution.
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There are only 14 percent of countries in the world that meet the WHO annual PM 2.5 guideline.
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Loni located in India is the most polluted city which recorded an annual average PM2.5 concentration of 112.5 µg/m³.
Such figures demonstrate that air pollution is not a local problem, it is a worldwide health crisis.
Top 10 Most Polluted Countries in the World
According to the IQ Air rankings, the following are the most polluted countries:
| Country/Region | 2025 |
| Pakistan | 67.3 |
| Bangladesh | 66.1 |
| Tajikistan | 57.3 |
| Chad | 53.6 |
| Democratic Republic of the Congo | 50.2 |
| India | 48.9 |
| Kuwait | 45.7 |
| Uganda | 43 |
| Egypt | 40.6 |
| Uzbekistan | 38.1 |
Most Polluted Countries in the World: India’s Rank
India falls in the top 10 list of being the most polluted countries in the world. It is 6th in the list and has and average PM 2.5 level of approximately 48.9 ug/m3. This nearly exceeds WHO limits by 10 fold. According to IQ Air’s most polluted cities list, 5 cities out of the top 10 are from India which shows the pollution crisis in the country.
What are the Reasons for High Pollution Levels Across the World?
The reports according to WHO point to several significant contributors:
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Coal powered energy and industrial emissions.
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Vehicle pollution in populated cities.
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Household combustion devices
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Forest fires and burning of crops
These factors are the most common reasons for air pollution in most countries.
In conclusion, the statistics reveal clearly that air pollution is increasingly becoming a worldwide issue. Countries such as Pakistan, Bangladesh, and India have extremely high PM2.5 levels, and they need to be addressed immediately.
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