Greta Jimenez
Air pollution is a pressing global issue, with 99% of the world's population living in areas with air quality that exceeds the World Health Organisation's (WHO) guideline limits. The burning of fossil fuels, vehicular emissions, industrial activities, and agricultural practices are major contributors to this problem. While there have been efforts to reduce pollution, such as China's investments in solar energy, many cities continue to struggle with poor air quality. As of 2025, the top 10 most polluted cities include Byrnihat and Delhi in India, and Karaganda in Kazakhstan. In 2024, Lahore, Pakistan, topped the list with a PM2.5 level of 150.4 µg/m³, and India had 12 cities in the top 15 most polluted list. This introduction sets the stage for exploring the critical question of which city is currently the most polluted on Earth.
| Characteristics | Values |
|---|---|
| Most polluted city in the world as of 2025 | Delhi, India |
| Previous year's most polluted city | Lahore, Pakistan |
| Causes of air pollution | Fossil fuel use, vehicular emissions, industrial activities, agriculture, and poor waste management |
| Health impacts | Respiratory conditions, cardiovascular diseases, lung cancer |
| Environmental impacts | Acid rain, eutrophication, climate change |
| Economic impacts | Increased medical costs, reduced productivity |
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What You'll Learn
- India: Home to 12 of the world's 15 most polluted cities
- China: 98% of urban areas exceed WHO guidelines
- Vehicular emissions: Fumes from traffic and fossil fuel-based vehicles
- Industrial activities: Poor pollution standards and industrial work
- Waste management: Burning of waste and poor disposal methods
India: Home to 12 of the world's 15 most polluted cities
India is home to 12 of the world's 15 most polluted cities, according to a 2024 report by Earth.Org. The report is based on data from IQAir's 2021 World Air Quality Report, which found that 99% of the global population lives in areas where the air quality exceeds World Health Organisation (WHO) guideline limits.
The Lancet estimates that air pollution kills over one million people in India every year. The air quality in New Delhi, India's capital, is reportedly 13.2 times higher than the new WHO limit. The poor air quality in India is caused by vehicular traffic fumes, diesel generators, the burning of fossil fuels for cooking, industrial activities, waste burning, and agricultural practices.
India's high level of air pollution can be attributed to various factors, including the burning of fossil fuels, vehicular emissions, industrial activities, agriculture, and poor waste management. These issues are not unique to India, as air pollution is a global issue that affects many countries, particularly those with low to middle incomes. According to the World Air Quality Index project's 2024 rankings, 13 of the 25 most polluted cities are located in India, with Lahore, Pakistan, leading the list with 150.4 µg/m³ of PM2.5.
PM2.5 refers to particulate matter that is 2.5 microns or less in width, which is considered highly dangerous due to its ability to penetrate deep into the lungs and bloodstream. These particles are released into the atmosphere through the burning of fossil fuels, such as coal, oil, and natural gas, and are a major cause of respiratory illnesses and environmental issues.
While India faces significant challenges in improving its air quality, there are ongoing efforts to address these issues. For example, companies like Oizom offer advanced air quality monitoring devices and promote sustainable practices and cleaner technologies. Additionally, India's extensive air pollution monitoring networks help detect pollution levels and inform necessary improvements.
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China: 98% of urban areas exceed WHO guidelines
While there are no explicit rankings of the most polluted city on Earth at this current moment, there are several cities that are frequently mentioned as being among the most polluted. According to a 2024 update, 13 of the 25 most air-polluted cities are located in India, 3 in China, and 3 in Pakistan. Other countries on the list include Bangladesh, Iraq, Israel, South Africa, Nepal, and Uganda. Lahore, Pakistan, leads the list with 150.4 µg/m³ of PM2.5, closely followed by several other cities.
In the context of China, it is important to note that while the country has made significant efforts to reduce air pollution, challenges persist. As of 2024, China has only 3 cities in the top 25 most polluted cities, down from 10 in previous years. This reduction can be attributed to concerted efforts by major Chinese cities to reduce particle pollution. For instance, Beijing banned coal heating in favor of natural gas, and the country as a whole has promoted clean energy. China is investing more in solar energy than any other nation, and by 2024, it is expected to generate twice as much power from solar as the United States.
Despite these efforts, air pollution remains a significant issue in China. As mentioned earlier, 3 Chinese cities are among the 25 most polluted globally. Additionally, 98% of China's urban areas exceed previous World Health Organization (WHO) guidelines, and 53% exceed the country's own less stringent national standards. This highlights that, while progress has been made, much remains to be done to improve air quality in China's urban areas.
The sources of air pollution in China are diverse and multifaceted. One significant contributor is the burning of fossil fuels, including coal, oil, and natural gas, for power generation and transportation. China's rapid industrialization and economic growth have likely contributed to the high levels of air pollution. Additionally, cultural and social factors play a role. For instance, fireworks during Lunar New Year celebrations are a significant source of air pollution in many Chinese cities.
To address the air pollution challenge, China has implemented various measures. In addition to the transition to natural gas and renewable energy sources, China has also worked to reduce particle pollution from industry and traffic. Furthermore, the government has tackled fuels used in homes for cooking and heating. These comprehensive efforts demonstrate China's commitment to improving air quality and reducing the health and environmental impacts of air pollution.
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Vehicular emissions: Fumes from traffic and fossil fuel-based vehicles
While I cannot determine which city is the most polluted at this exact moment, I can provide information on vehicular emissions and air pollution.
Vehicular emissions from traffic and fossil fuel-based vehicles are a significant contributor to air pollution. The burning of fossil fuels, such as gasoline and diesel, releases carbon dioxide, methane, nitrous oxide, and hydrofluorocarbons into the atmosphere. These emissions are not limited to the combustion process but also include the refining and distribution of fuels, as well as the manufacturing and disposal of vehicles. Cars, trucks, and buses powered by fossil fuels emit pollutants throughout their lifecycle, impacting both human health and the environment.
Transportation is a major source of heat-trapping emissions, with tailpipe emissions from road vehicles accounting for over one-fifth of the United States' total. In addition to carbon dioxide, vehicles emit harmful pollutants such as nitrogen oxides, volatile organic compounds (VOCs), and particulate matter. These emissions react with other substances in the atmosphere, forming smog and ground-level ozone, which are linked to increased respiratory illnesses and adverse effects on nearly every organ system in the body. The exposure to pollution from vehicles is inequitable, disproportionately affecting Latinos, Blacks, and lower-income households.
To address vehicular emissions, electric vehicles (EVs) have been introduced, offering a zero-tailpipe emission alternative. Fuel cell electric vehicles (FCEVs) operating on hydrogen only emit water vapor. Plug-in hybrid electric vehicles (PHEVs) can also reduce emissions, especially when operating on electricity alone. However, the overall emissions of PHEVs depend on their specific operation, battery capacity, driving patterns, and charging frequency.
Some countries and cities are taking initiatives to transition to zero-emission transportation. For example, New York and Los Angeles have committed to adopting 100% zero-emission transit buses, and China is investing heavily in solar energy, aiming to generate twice as much power from solar as the US by 2024. These efforts, along with improved fuel and vehicle technologies, can significantly reduce emissions and improve air quality, ultimately reducing the health and environmental risks associated with vehicular emissions.
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Industrial activities: Poor pollution standards and industrial work
Poor pollution standards and industrial work are significant contributors to air pollution in cities. Industrial activities, such as manufacturing, power generation, and fossil fuel combustion, release harmful emissions and pollutants into the atmosphere. These emissions often include nitrogen oxides, carbon dioxide, carbon monoxide, and sulfur oxides, which contribute to the formation of ground-level ozone and smog.
Industrial pollution encompasses various forms, including air, water, and soil pollution. It is caused by the improper disposal of industrial waste and emissions, as well as the release of chemicals and contaminants during industrial processes. For example, the Tamar estuary in Tasmania, Australia, has been affected by industrial development, with elevated levels of heavy metals detected in the water. Similarly, the burning of fossil fuels in power plants to generate electricity releases significant amounts of air pollutants and emissions, impacting both human health and the environment.
The exponential increase in industrialization has led to the consumption of large areas of agricultural land and serious environmental degradation of soil. Industrial waste contains pollutants such as metal contaminants and persistent organic pollutants (POPs), which can be transported by physical processes like wind and water currents or by living organisms, impacting ecosystems and the environment.
Urban regulations play a crucial role in mitigating industrial air pollution. Strategic placement of industries, zoning laws, and emission standards help reduce community exposure to pollutants. For instance, London's Ultra-Low Emission Zone (ULEZ) has successfully reduced vehicle emissions and improved air quality. Similarly, Beijing has improved its air quality by reducing coal consumption and increasing renewable energy use.
However, despite efforts to improve air quality, industrial activities continue to contribute significantly to global pollution levels, particularly in rapidly industrializing nations. Poor pollution standards and a lack of enforcement of emission limits in certain countries exacerbate the problem. As a result, air pollution from industrial activities poses a major threat to global health, causing respiratory illnesses and contributing to millions of deaths worldwide each year.
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Waste management: Burning of waste and poor disposal methods
While it is challenging to identify the single most polluted city on Earth at any given moment, India's New Delhi was ranked as the city with the worst air quality in the world in 2021. Air pollution in India is caused by vehicular traffic fumes, diesel generators, the burning of fossil fuels for cooking, industry, the burning of waste, and agricultural practices.
The burning of waste and poor disposal methods are significant contributors to air pollution, which affects human health and nature. Waste disposal releases harmful substances into the air, worsening existing health problems and making it difficult to breathe. Open-air incinerators and uncontrolled dumping release pollutants into the atmosphere, increasing the risk of respiratory illnesses and other health issues such as nose and throat infections, inhalation difficulties, bacterial infections, and asthma.
In addition to air pollution, poor waste disposal methods can also lead to water pollution. Landfills, for example, can contaminate groundwater and water supplies. Inadequate waste management practices, such as mixing household and commercial garbage with hazardous waste and storing waste in old or poorly managed facilities, contribute to environmental pollution and public health problems.
The impact of poor waste management is more severe in low- and middle-income countries, where 99% of the population is exposed to polluted air. The burning of fossil fuels, including coal, oil, and natural gas, is a significant source of air pollution, releasing pollutants and emissions that contribute to smog and respiratory illnesses.
To address the issue of air pollution caused by waste management, proper waste disposal methods such as recycling, composting, and safe waste treatment are essential. Public awareness campaigns can also play a role in encouraging people to stop littering and adopt proper waste disposal practices. By improving waste management practices and transitioning to cleaner energy sources, cities can reduce air pollution and improve the health and well-being of their residents.
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Frequently asked questions
As of 2025, the top 10 most polluted cities include Byrnihat, Karaganda, and Delhi, with the latter two located in India and Kazakhstan, respectively.
India, with 12 out of the world's 15 most polluted cities.
Vehicular emissions, industrial activities, fossil fuel use, agriculture, and poor waste management are the major causes of air pollution in these cities.
Air pollution has been linked to respiratory conditions, cardiovascular diseases, lung cancer, and increased mortality from stroke.
Some measures to reduce air pollution include adopting clean energy sources, improving fuel standards for vehicles and homes, and implementing sustainable practices in industries.
