Kiera Jefferson
Bangladesh has some of the most polluted air in the world. In 2024, it was ranked as the second most polluted country in the world for PM2.5 concentration, which was 15.6 times the World Health Organization's annual PM2.5 guideline value. Air pollution causes severe physical and mental health issues, including breathing difficulties, lower respiratory tract infections, and depression, and it is estimated that each resident of the country is losing 6.8 years of life expectancy. The main causes of air pollution in Bangladesh are vehicular emissions, fumes from factories and brick kilns, dust accumulation, and the burning of fossil fuels and biomass. Rapid urbanization, population growth, and the changing climate are also contributing factors.
| Characteristics | Values |
|---|---|
| Vehicular emissions | Carbon monoxide (CO), ozone, nitrogen dioxide (NO2), sulfur dioxide (SO2) |
| Fumes from factories | Black carbon, furans, dioxins, lead, mercury, polynuclear aromatic hydrocarbons, polychlorinated biphenyls |
| Brick kilns | Black carbon, furans, dioxins, lead, mercury, polynuclear aromatic hydrocarbons, polychlorated biphenyls |
| Dust accumulation | PM2.5, PM10 |
| Population growth | 162 million people |
| GDP loss | 3.9 to 4.4% |
| Deaths caused by air pollution in 2019 | 78,145–88,229 |
| Health risks | Miscarriage, stillbirth, underweight babies, premature births, breathing difficulties, cough, lower respiratory tract infections, depression |
| Natural disasters | Tropical cyclones, severe flooding |
| Nuclear energy capacity | 2.4 gigawatts |
| Nuclear energy cost | $12.65 billion |
Explore related products
What You'll Learn
Population growth and urbanisation
Bangladesh is the world's most polluted country, and its capital, Dhaka, is one of the most densely populated cities in the world. Dhaka's population growth rate is 3.48% per year, driven by a high urbanization rate of 77.36%. This rapid urbanization has resulted in a massive influx of rural-to-urban migration, with people moving from rural and suburban areas to the city in search of better opportunities. As a result, Dhaka has a population of 12.5 million people, and its air quality is severely impacted.
The combination of population growth and urbanization has led to several interconnected problems in Dhaka. Firstly, the city has experienced rapid and unchecked expansion, with informal settlements and slums proliferating due to uncontrolled urbanization. These areas are characterized by high population density, inadequate housing, and a lack of basic services. The overcrowding and lack of proper infrastructure have contributed to the spread of infectious diseases and respiratory illnesses.
Secondly, the growing population has increased the demand for transportation, leading to more vehicles on the roads and contributing to traffic congestion. Dhaka's air quality has been greatly impacted by this congestion, with vehicles emitting pollutants such as nitrogen dioxide (NO2) and sulfur dioxide (SO2). In addition, the introduction of CNG and the prohibition of two-stroke engines have inadvertently worsened air quality, as the conversion of diesel vehicles has increased high-emission particulates and black carbon.
Moreover, the population growth and urbanization have also impacted industrial activities. Brick kilns and factories have sprung up to meet the demands of the growing population, but these contribute significantly to air pollution. These kilns, often operated out of family homes or shops, use crude oil, fossil fuels, coal, and biomass as energy sources, releasing pollutants such as black carbon and organic carbon into the atmosphere.
The combination of population growth and urbanization has resulted in a complex set of challenges for Dhaka. The high population density and inadequate infrastructure have exacerbated the city's air pollution levels, posing significant risks to the health and well-being of its residents. Addressing these issues will require collective efforts from both the government and citizens, including the implementation of fines, education, and the promotion of cleaner fuel sources.
Techniques to Remove Air Pollutants from the Atmosphere
You may want to see also
Explore related products
Vehicular emissions
Bangladesh's air quality is among the worst in the world. Vehicular emissions are a major contributor to the country's poor air quality. The country's rapid urbanization has led to a massive influx of rural-to-city migration, resulting in an increase in the number of vehicles on the roads. This, in turn, has led to a rise in vehicle emissions, which include pollutants such as nitrogen dioxide, carbon monoxide, ozone, sulfur dioxide, black soot, sulfur, and other toxic compounds and gases. These emissions have severe health impacts on the population, including irritation to mucous membranes, increased bouts of chest infections, and susceptibility to respiratory conditions such as influenza and pneumonia.
The lack of regulations regarding engine and motor standards in Bangladesh exacerbates the problem. Many cars, motorbikes, and buses are kept in use long after they should have been taken off the road. These older vehicles, running on fossil fuels such as diesel, release large amounts of pollutants into the atmosphere, contributing significantly to the country's high levels of ambient pollution. The situation is made worse by the country's growing consumption of fossil fuels, particularly oil, coal, and natural gas, which not only worsens air pollution but also contributes to negative climate impacts.
To address the issue of vehicular emissions, Bangladesh could consider adopting cleaner fuels and introducing new regulations. While nuclear energy is an option, it is costly and challenging to expand in the near term. Liquefied natural gas (LNG) is a more affordable and nearer-term option, as it burns cleaner than coal and oil. Additionally, improving public transportation and encouraging the use of electric vehicles can help reduce vehicle emissions.
The government has taken some steps to address the country's air pollution issues. The Air Pollution Control Rules, published in 2022, form the basis for the National Air Quality Management Plan, which is expected to be finalized in early 2024. However, implementing these rules and improving air pollution data monitoring systems remain significant challenges.
The severe air pollution in Bangladesh has dire health consequences for its citizens. It is estimated that air pollution caused about 78,145–88,229 deaths in the country in 2019. Additionally, high levels of air pollution are associated with increased risks of breathing difficulties, coughs, lower respiratory tract infections, depression, and other health issues. The World Bank report, 'Breathing Heavy: New Evidence on Air Pollution and Health in Bangladesh', emphasizes the urgent need for improving public health services and response mechanisms to mitigate the impacts of air pollution on the population's health.
Air Pollution: The Costly US Crisis
You may want to see also
Explore related products
Industrial fumes
Bangladesh's air quality is among the worst in the world. The country's growing use of fossil fuels has worsened air pollution and contributed to climate change, which, in turn, exacerbates air quality. Notably, the country's consumption of coal is far lower than that of regional neighbours, such as China.
Coal-fired brick kilns are another major source of air pollution in Bangladesh. These kilns emit black carbon, which absorbs solar radiation and releases it as heat. Black carbon is also released from factories and automobiles, and it accumulates in the atmosphere and on roads. Other pollutants emitted from kiln fires include furans, dioxins, lead, mercury, polynuclear aromatic hydrocarbons, and polychlorinated biphenyls, all of which have disastrous effects on human health, wildlife, and vegetation. Fine particulate matter (PM2.5) is found in high concentrations in areas near brick kilns, and it is considered the most hazardous to health.
To improve air quality, Bangladesh is pursuing nuclear energy, with its first reactor set to begin operation soon. Nuclear energy produces no emissions or pollutants, but it has been a costly endeavour for the country. A more affordable option for reducing air pollution is liquefied natural gas (LNG), which burns cleaner than coal and oil.
The Main Culprits Behind Air Pollution
You may want to see also
Explore related products
Fossil fuels and biomass burning
Bangladesh's air quality is among the worst in the world. Fossil fuel combustion contributes to 21.6% of overall PM2.5 from September 2013 to December 2017, with a higher contribution of 44.3% during the monsoon season. The growing use of fossil fuels has worsened air pollution and contributed to climate impacts, which will have negative economic effects. For example, the United Nations Intergovernmental Panel on Climate Change predicts that Bangladesh could lose 2 to 9 percent of its GDP due to more frequent natural disasters.
Bangladesh's electricity production heavily relies on fossil fuels, particularly natural gas, which makes up approximately 54% of the current installed capacity. The worldwide reliance on fossil fuels has surged, leading to a significant rise in carbon dioxide emissions. To address this, Bangladesh is building two new nuclear power plants, with its first reactor set to begin operation soon. While nuclear energy produces no emissions or pollutants, it has been a costly pursuit for the country. A more affordable option for reducing air pollution is liquefied natural gas (LNG), which burns cleaner than coal and oil.
Biomass burning, on the other hand, contributes to 40.2% of overall PM2.5 from September 2013 to December 2017, with a higher contribution of 41.4% during the non-monsoon season. Biomass is a significant source of energy in Bangladesh, providing 73% of total energy in rural areas. Biomass resources include wood, cow dung, agricultural wastes, and municipal solid waste. These are burned to generate heat and drive turbines for electricity production. The use of biomass offers advantages such as low cost and high energy conversion efficiency compared to fossil fuels.
To address the air pollution crisis in Bangladesh, a combination of short-term and long-term solutions is necessary. While nuclear energy and liquefied natural gas can provide some relief, the country should also focus on utilizing biomass as a renewable energy source. Additionally, improving public health services, air pollution data monitoring, and early warning systems are crucial to mitigate the health impacts of air pollution.
How Coal Burning Causes Air Pollution
You may want to see also
Explore related products
Transboundary pollution
Bangladesh is one of the most polluted countries in the world. While there are many areas of pristine beauty and clean air in the country, particularly in rural areas, the extremely poor placing in terms of its pollution levels is due to major cities such as Dhaka. The city of Dhaka and its vicinity severely suffer from high levels of particulate matter (PM) concentrations in the atmosphere, especially during the dry season (November–April).
The sources in the eastern Indian regions bordering Bangladesh, in the northern and northeastern Indian regions bordering Nepal, and in Nepal and its neighbouring areas, have a high probability of contributing to the PM2.5 concentrations in Dhaka. Transboundary PM from the eastern direction might not be as important as the C5 trajectories responsible for carrying pollution from the east were very low and they did not dominate any specific time period. However, transboundary transport of PM is crucial in such a continental pollution scenario as fine particles (PM2.5) have days to weeks of lifetime in the atmosphere and can travel hundreds or thousands of kilometres, polluting transboundary regions.
The probability of contributions of transboundary sources to PM pollution in Dhaka was investigated through different approaches. Ninety-six-hour backward trajectories with every 3-hour interval were computed and clustered into six groups based on angle distance matrices. The North-western Indian regions, Nepal and its neighbouring areas, and the Indian state of West Bengal were identified as the most probable zones that might have contributed to PM pollution in Gazipur, Dhaka. November to January is when the station experienced fine particles from those transboundary regions.
To combat transboundary air pollution, four South Asian countries – Bangladesh, India, Nepal and Pakistan – agreed on the need to reduce national annual average PM 2.5 levels to 35 micrograms per cubic meter by 2030. The declaration was forged in Nepal in December 2022, during meetings facilitated by the World Bank and the International Centre for Integrated Mountain Development. However, this transboundary agreement has yet to garner political endorsement.
Air Pollution's Impact: Understanding the Human Health Cost
You may want to see also
Frequently asked questions
Bangladesh's air pollution is caused by a combination of emissions from old vehicles, brick kilns, construction work, burning fossil fuels and biomass, and dust accumulation. The country's growing population and rapid urbanization have also contributed to the problem.
Air pollution has severe health impacts on the people of Bangladesh. It has been linked to breathing difficulties, coughs, lower respiratory tract infections, depression, and other health conditions. According to a World Bank report, air pollution caused about 78,145–88,229 deaths in Bangladesh in 2019.
Bangladesh is taking initiatives to improve its air quality, such as investing in nuclear energy and liquefied natural gas (LNG). The country is also addressing the multidimensional and multisectoral drivers of air pollution, with a focus on reducing emissions and improving air quality through comprehensive policy reforms.
