Meghan Hodges
Air pollution is a significant issue in Southeast Asian cities, with 37 out of the 40 most polluted cities in the world located in this region. On January 24, 2025, Ho Chi Minh City in Vietnam was ranked as the second most polluted city in the world, with levels of fine inhalable particles 11 times higher than the recommended level by the World Health Organization. Hanoi, the capital of Vietnam, was previously ranked as the world's most polluted city, and other Southeast Asian cities like Bangkok, Phnom Penh, and Jakarta also consistently rank among the most polluted globally. The main sources of air pollution in these cities include vehicles, power plants, industrial emissions, crop-related burning, and heavy traffic. The pollution has severe health impacts, reducing life expectancy and causing various ailments and chronic diseases.
| Characteristics | Values |
|---|---|
| Most Polluted City in Southeast Asia | Ho Chi Minh City, Vietnam |
| Date of Ranking | 24 January 2025 |
| Ranking Organization | IQAir |
| Level of Fine Inhalable Particles | 11 times higher than the recommended level by the World Health Organization |
| Second Most Polluted City | Phnom Penh |
| Third Most Polluted City | Bangkok, Thailand |
| Primary Causes of Air Pollution | Crop-related burning, industrial pollution, and heavy traffic |
| Effects of Air Pollution | Congestion, irritation of the eyes, cardiovascular and respiratory ailments, and headaches |
| Long-term Effects of Air Pollution | Oxidative stress, inflammation in human cells, cancer, cardiovascular disease, respiratory diseases, diabetes, and obesity |
| Government Measures | Free public transportation for a week, promotion of electric vehicles, and carbon tax |
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What You'll Learn
Ho Chi Minh City, Vietnam
The primary sources of pollutants in Ho Chi Minh City are vehicular pollution and industrial emissions. The number of vehicles on the road has been increasing, and transport contributes significantly to the emission of PM2.5, PM10, and Black Carbon. The manufacturing and energy sectors are the biggest contributors to sulfur dioxide and nitrogen dioxide emissions in the city. Additionally, with Vietnam's rapid industrialization, the number of factories and industrial zones, particularly in and around major cities, has increased significantly. These industries often rely on fossil fuels and emit pollutants such as particulate matter, sulfur dioxide, and nitrogen oxides.
The city's air pollution has severe health implications for its residents. The high levels of pollutants in the air can cause short-term acute side effects such as cardiovascular and respiratory ailments, headaches, and eye irritation. Long-term exposure to air pollution has even more concerning health effects and has been linked to chronic diseases, including cancer, cardiovascular disease, respiratory diseases, diabetes, and obesity.
To combat air pollution, the Vietnamese government has implemented several short-term solutions. These include tighter regulations on vehicle emissions and improved traffic control systems. The government has also suggested that construction sites must take more responsibility for controlling dust and other pollutants generated by their activities. Additionally, there is a push for the adoption of electric vehicles and the promotion of public transportation to reduce the number of cars on the road.
In conclusion, Ho Chi Minh City, Vietnam, is one of the most polluted cities in Southeast Asia, facing severe air quality issues due to various factors, primarily vehicular and industrial pollution. The government and citizens are working towards implementing short-term and long-term solutions to mitigate the pollution and improve the health and well-being of the city's residents.
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Hanoi, Vietnam
The pollution in Hanoi has severe health implications for its residents. Many people have complained about respiratory problems and breathing difficulties, with some reporting that they do not feel they can breathe easily in the open air and must wear masks all the time. The WHO has linked air pollution exposure to a range of serious health conditions, including strokes, heart disease, and lung cancer.
The Vietnamese government has acknowledged the severity of the issue and has urged the public to take protective measures, such as wearing masks and eye protection. Authorities have also pushed for longer-term solutions to tackle pollution, including the promotion of electric vehicles (EVs) and the implementation of a carbon tax. Hanoi has set a target for at least 50% of buses and 100% of taxis to be EVs by 2030.
The pollution in Hanoi is not an isolated issue within Southeast Asia. The region experiences some of the worst air pollution in the world, with 37 out of the 40 most polluted cities globally located in Southeast Asia. Cities like Jakarta, Bangkok, and Ho Chi Minh City also consistently rank among the most polluted, with air pollution spiking during the dry months when meteorological conditions combine with pollutants from fossil fuels and other sources.
The high levels of pollution in Hanoi and other Southeast Asian cities are caused by a combination of natural and human factors. Human-caused sources include vehicle emissions, power plants, industrial emissions, and agricultural burning. Natural factors, such as warmer temperatures, lack of rainfall, and meteorological conditions associated with the El Niño weather pattern, also contribute to the degradation of air quality in the region.
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Jakarta, Indonesia
There are several factors contributing to Jakarta's poor air quality. Firstly, the city experiences a significant influx of commuters from surrounding areas, with around 10 million people entering the city daily, leading to a high volume of vehicle emissions. As of 2018, there were approximately 20 million motorized vehicles in Jakarta, including 13 million motorcycles, and this number continues to grow annually. The transport sector is the primary contributor to air pollution in Jakarta, with vehicles emitting fine particulate matter such as PM2.5, PM10, and Black Carbon. These particles are associated with vehicle exhaust, coal plant emissions, and industrial processes.
Secondly, meteorological conditions play a significant role in Jakarta's air pollution. The city's dry season, typically from June to August, experiences a lack of moisture in the atmosphere, higher temperatures, low humidity, and low wind speeds. These conditions create an ideal environment for the buildup of pollutants, leading to a visible haze that can impact lung and heart function. The El Niño weather pattern often extends the dry season, further intensifying the pollution levels.
Additionally, the manufacturing and energy sectors in Jakarta are significant contributors to the city's air pollution. These industries emit pollutants such as sulfur dioxide (SO2) and nitrogen dioxide (NO2).
To address the air pollution crisis, organizations like WRI Indonesia are working on projects like the Clean Air Catalyst, funded by the U.S. Agency for International Development. The project aims to utilize weather forecasting, atmospheric chemistry models, and additional air quality monitoring tools to pinpoint the exact sources and causes of Jakarta's pollution. By understanding the specific contributors, more effective solutions can be implemented to reduce pollution levels and improve the health and well-being of Jakarta's residents.
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Bangkok, Thailand
Bangkok's air pollution is caused by a combination of crop-related burning, industrial pollution, and heavy traffic. The city's air quality is worst during the dry season, from November to April, when farmers burn fields and weather conditions trap smoke and pollutants close to the ground. The dry season is prolonged by the El Niño weather pattern, which also exacerbates ground-level ozone, a pollutant that can impact lung and heart function.
In 2022, 72% of Bangkok's pollution was attributed to combustion engines. The manufacturing and energy sectors are also major contributors to the city's air pollution, particularly in terms of sulfur dioxide and nitrogen dioxide emissions. The health effects of air pollution are wide-ranging, from short-term respiratory issues like coughing and wheezing to severe long-term health issues such as cardiovascular disease, stroke, and lung cancer. Bangkok's Air Quality Index (AQI) often reaches unhealthy levels, indicating substantial health risks for the general population.
To address the issue of air pollution, the Bangkok Metropolitan Administration (BMA) has implemented a range of measures. In January 2025, the government allowed free public transportation for a week to reduce the number of vehicles on the roads. The city has also distributed nearly a million PM2.5 masks to vulnerable groups and set up dust-free rooms in public spaces. Designated surveillance zones have been identified, with tailored interventions to reduce public exposure to harmful fine particulate matter.
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Air pollution causes and solutions
Air pollution is a significant issue in Southeast Asian cities, with 37 out of the 40 most polluted cities in the world located in the region. This is due to a combination of natural and human-caused factors. The two most damaging types of air pollution in Asia are fine particulate matter and ground-level ozone.
Causes
Fine particulate matter, or PM2.5, is a group of microscopic substances measuring less than 2.5 microns in diameter. These particles can penetrate deep into the lungs and enter the bloodstream, causing serious health issues such as heart disease and lung cancer. In Southeast Asian cities, PM2.5 levels often exceed the World Health Organization's guidelines, with Vietnam's Ho Chi Minh City experiencing levels 11 times higher than the recommended amount.
The primary sources of PM2.5 in Southeast Asian cities are vehicles, power plants, and industrial emissions. Jakarta, for example, experiences a daily influx of 10 million commuters, resulting in a high volume of car traffic. As of 2018, there were 20 million motorized vehicles in the city, and emissions inventories confirm that transport contributed significantly to PM2.5, PM10, and Black Carbon emissions. Similarly, in Bangkok, combustion engines were attributed to 72% of the city's pollution in 2022. The manufacturing and energy sectors are also major contributors to sulfur dioxide and nitrogen dioxide emissions in Jakarta and other cities.
Ground-level ozone, or O3, is a gas that forms when fuel vapors, chemical solvents, and other pollutants are heated by the sun. It is a common ingredient in smog and is linked to respiratory issues such as asthma, emphysema, and chronic bronchitis. Warmer temperatures, lack of rainfall, increased sunshine, and changes in wind speed and direction can exacerbate the formation of ground-level ozone and degrade air quality in tropical monsoon climates.
Solutions
To address air pollution in Southeast Asian cities, governments are considering both short-term and long-term solutions. In the short term, authorities in Hanoi, Vietnam, issued a warning about the health risks of air pollution and urged the public to wear masks and eye protection. Similarly, in Bangkok, Thailand, the government offered free public transportation for a week to reduce traffic-related pollution.
For long-term solutions, governments in Southeast Asia are exploring options such as implementing a carbon tax and promoting the use of electric vehicles. Additionally, the IQAir report recommends that governments invest in renewable energy initiatives, provide incentives for cleaner vehicles, improve infrastructure for better pedestrian mobility, and ban agricultural burning practices.
By implementing a combination of short-term and long-term strategies, Southeast Asian countries can effectively tackle the issue of air pollution and improve the health and well-being of their citizens.
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Frequently asked questions
Hanoi in Vietnam was ranked the world's most polluted city in January 2025. Ho Chi Minh City, also in Vietnam, was ranked the second-most polluted city in the world during the same period.
The major sources of air pollution in Southeast Asian cities are vehicles, power plants, and industrial emissions. In 2020, an emissions inventory confirmed that transport contributed 67% of PM2.5 emissions, 58% of PM10 emissions, and 84% of Black Carbon emissions in Jakarta, Indonesia. Similarly, 72% of Bangkok's pollution was attributed to combustion engines in 2022.
Air pollution is associated with various short-term and long-term health effects. Short-term effects include cardiovascular and respiratory ailments, headaches, and eye irritation. Long-term exposure to air pollution is linked to more severe health issues such as cancer, cardiovascular disease, respiratory diseases, diabetes, and obesity. Additionally, research has found connections between air pollution and adverse pregnancy outcomes, such as low birth weight, miscarriages, and stillbirths.
