Helena Joyce
Ho Chi Minh City, Vietnam's largest city, is facing a significant air pollution crisis, with levels of PM2.5 exceeding national standards and WHO guidelines. The primary sources of pollutants are vehicular emissions and industrial activities, which cause traffic congestion and increase the emission of air pollutants. The high levels of air pollution have been linked to an increased risk of respiratory diseases, especially among children. While Hanoi has been reported to suffer from worse air pollution due to agricultural burning, Ho Chi Minh City is not far behind, with residents experiencing coughing, sore throats, and other health issues. The city's air quality index has frequently exceeded the 'unhealthy' threshold, indicating a severe air quality issue that needs to be addressed.
| Characteristics | Values |
|---|---|
| Air Quality Index (AQI) | 50 |
| Nitrogen Dioxide (NO2) AQI | 36 |
| Ozone (O3) AQI | 30 |
| Carbon Monoxide (CO) AQI | 8 |
| Fine Particulate Matter (PM2.5) | Exceeds Vietnam National Standard and WHO guideline |
| Coarse Particulate Matter (PM10) | Positively associated with Acute Lower Respiratory Infection (ALRI) admissions during the dry season |
| Primary Sources of Pollutants | Vehicular pollution, industrial emissions, agricultural burning, construction activities |
| Health Effects | Respiratory diseases, especially in children |
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What You'll Learn
Air pollution and health
Air pollution in Ho Chi Minh City, Vietnam, is a pressing issue with significant health implications. The city's air quality index (AQI) frequently exceeds the "unhealthy" threshold, indicating severe air pollution that poses risks to human health.
One of the primary sources of air pollution in Ho Chi Minh City is vehicular emissions, with the large and growing number of motor vehicles causing traffic congestion and increased air pollutant emissions. This includes particulate matter such as PM2.5 and PM10, which have been linked to adverse health effects, particularly respiratory issues. Studies have shown that high levels of PM2.5 are associated with an increased risk of hospital admission for acute lower respiratory infection (ALRI) among young children in the city. The risk of ALRI admission increases by 3.51 for every 10 μg/m3 increase in PM2.5 exposure. Similarly, an increase in PM2.5 levels is associated with a higher risk of pneumonia admission among children aged 0-17 and 1-5 years old.
In addition to vehicular emissions, industrial emissions also contribute significantly to air pollution in Ho Chi Minh City. The rapid industrialization of Vietnam's economy has led to a rise in factories and industrial zones, particularly around major cities. These industries often rely on fossil fuels and emit pollutants such as particulate matter, sulfur dioxide, and nitrogen oxides. The combination of vehicular and industrial emissions has led to a growing air quality crisis in Ho Chi Minh City, with the city ranking among the world's most polluted according to IQAir's 2021 World Air Quality Report.
The health effects of air pollution in Ho Chi Minh City are not limited to respiratory issues. High levels of air pollutants can also cause other health problems such as sinusitis and an increased risk of hospital admission for various diseases. The pollution is so severe that some residents have reported developing a cough and sore throat after just one week of exposure. To mitigate the health risks, residents may need to rely on air purifiers, air conditioners, and high-quality respirator masks to protect themselves from the harmful effects of air pollution.
While Ho Chi Minh City faces significant air pollution challenges, it is important to note that the situation is not unique to the city. Vietnam as a whole is experiencing a growing air quality crisis due to rapid urbanization and industrialization, particularly in major cities. Ho Chi Minh City's air pollution levels may be influenced by regional factors, such as the burning of rice husks by farmers during the harvest season, which contributes to dangerous pollution levels across Southeast Asia.
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Vehicular pollution
Ho Chi Minh City is frequently ranked among the most polluted cities in Vietnam, with air pollution levels often exceeding WHO air quality guidelines. Vehicular pollution is one of the primary sources of this issue, along with industrial emissions, agricultural burning, construction activities, household pollution, waste burning, and transboundary air pollution.
The economic liberalization of Vietnam has resulted in a significant increase in vehicular traffic, industrialization, and urbanization, all of which have contributed to the degradation of air quality in Ho Chi Minh City. The rise in the number of motorbikes, cars, and public transport vehicles on the roads has led to elevated levels of particulate matter (PM2.5), nitrogen dioxide (NO2), and other harmful pollutants in the city's atmosphere. According to data from May 31, 2025, Ho Chi Minh City's nitrogen dioxide (NO2) AQI was 36, and its ozone (O3) AQI was 30.
The impact of vehicular pollution on the city's environment and public health is significant. Air pollution contributes to respiratory diseases, cardiovascular problems, reduced lung function, and even mental health issues such as depression. To protect themselves from the harmful effects of air pollution, residents are advised to regularly check the AQI, wear N95 masks, stay indoors during periods of high pollution, use air purifiers, and refrain from outdoor exercise during peak pollution times.
While the situation is dire, there is hope for improvement through specific interventions and broader economic shifts. Historical data has shown that air quality improvements can be achieved, and recent initiatives aimed at tackling pollution offer a positive outlook. However, challenges in policy implementation persist, and the complex nature of the issue, influenced by rapid urbanization and industrialization, demands continuous effort and effective environmental policies.
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Industrial emissions
A study by the Vietnam Environment Administration highlighted that industrial emissions are one of the three main causes of deteriorating air quality in HCMC. Gas emissions from vehicles and air pollutants from construction sites were the other two leading causes. The specific pollutants emitted by industries include particulate matter, sulfur dioxide, and nitrogen oxides.
The industrial sector has been identified as contributing 44% of PM2.5 emissions in HCMC. This fine particulate matter, along with nitrogen dioxide and other harmful pollutants, has been found at elevated levels in HCMC due to the rise in industrial factories. Historical data and studies have consistently shown these high levels, which have negatively impacted human health in the city.
To address the issue of industrial emissions in HCMC, studies have recommended avoiding further industrial development in the upwind areas to achieve better air quality. Emission control strategies should focus on reducing emissions in the downtown area, where about half of the emissions originate. The eastern areas of the city also need to limit industrial development due to the wind patterns that blow pollutants to the west and north.
Overall, the industrial activities in and around HCMC have significantly contributed to the city's poor air quality. Implementing effective emission control strategies and improving industrial practices are crucial steps towards improving the respiratory health of HCMC residents.
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High levels of PM2.5
Ho Chi Minh City (HCMC) is the most populous city in Vietnam, and it is also one of the most air-polluted cities in the country. The city has high levels of PM2.5, which are fine particulate pollutants that pose a high health risk to residents.
PM2.5 concentrations were measured at various sites across the city from March 2017 to March 2018, with levels ranging from 10.4 to 110.8 µg m–3 and an annual mean of 36.3 ± 13.7 µg m–3. These levels exceed the Vietnamese standard of 25 µg m–3 and the World Health Organization's (WHO) air quality guideline of 10 µg m–3.
The COVID-19 pandemic and associated restrictions led to a downward trend in PM2.5 concentrations in HCMC. During the pandemic period from 2020 to 2021, PM2.5 levels decreased by 18% compared to the previous three years. However, even during the pandemic, about half of the days still had PM2.5 levels exceeding the WHO standard.
Meteorological factors, such as wind speed and air temperature, also influenced PM2.5 levels in the city. The rainy season and the west-south-west monsoon wind direction contributed to reduced PM2.5 concentrations. In contrast, the dry season and months with heavy rains were associated with higher PM2.5 levels, possibly due to the biomass burning of rice straw residues in the Mekong Delta area.
The high levels of PM2.5 in HCMC have prompted the use of low-cost PM2.5 sensors to monitor real-time air pollution levels and evaluate the health impacts on the city's residents.
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Air quality in different districts
Air quality in Ho Chi Minh City varies across different districts. The Air Quality Index (AQI) is a standard measurement system that indicates how clean or polluted the air is, and it is used to determine the overall air quality in Ho Chi Minh City and its individual districts.
On one particular day, May 31st, 2025, the AQI for Ho Chi Minh City as a whole was rated as n/a, indicating a lack of data or inconclusive results. However, delving into specific districts reveals varying levels of air pollution. For example, the district of Quan Chin had an AQI of 80, while the district of Can Gio had a significantly lower AQI of 68.
Quan Chin's AQI of 80 suggests that the air quality is moderate, which means that sensitive groups, such as people with respiratory issues or the elderly, may experience some health effects, while the general population is unlikely to be impacted. On the other hand, Can Gio's AQI of 68 indicates good air quality, with little to no health concerns for the majority of individuals.
Other districts in Ho Chi Minh City also showed varying levels of air quality on the same day. For instance, the district of Cu Chi had an AQI of 83, which is considered moderate, while the district of Thu Duc had a much lower AQI of 52, indicating generally good air quality.
It is important to note that air quality can fluctuate and vary from day to day, and even within different areas of the same district. Real-time air quality monitoring applications and websites can provide more up-to-date and specific information on the air quality in Ho Chi Minh City and its individual districts.
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Frequently asked questions
Air pollution in Ho Chi Minh City has been linked to an increased risk of respiratory diseases, especially in young children. Studies have found a correlation between high levels of PM2.5 and hospital admissions for acute lower respiratory infection (ALRI) and pneumonia in children under five years old.
The primary sources of air pollution in Ho Chi Minh City are vehicular emissions and industrial activities. The large number of motor vehicles on the road contributes to traffic congestion and increases the emission of air pollutants. Additionally, the rapid increase in construction and industrial activities in and around the city has led to a rise in industrial emissions, with many factories relying on fossil fuels.
Ho Chi Minh City is one of the most polluted cities in Vietnam, along with Hanoi. According to IQAir's 2021 World Air Quality Report, both cities frequently rank among the most polluted globally. Hanoi tends to have slightly worse air pollution due to agricultural burning, while Ho Chi Minh City's pollution is more closely linked to vehicular emissions and industrial activities.
Yes, there are several apps and tools available to monitor air quality in real-time. The AirVisual app provides updates on air quality in different areas of the city. There are also browser plugins available for Chrome and Firefox that provide real-time air pollution levels.
Improving air quality in Ho Chi Minh City requires a comprehensive approach. This includes implementing policies to reduce vehicular emissions, such as promoting public transportation, electric vehicles, and stricter emission standards. Additionally, regulating industrial activities, encouraging the use of cleaner energy sources, and increasing green spaces in the city can help improve air quality over time.
