
Transboundary haze pollution is an environmental issue caused by land and forest fires that spread across national borders. It is a significant problem in Southeast Asian countries, with Singapore, Malaysia, Brunei, and Thailand all affected by the haze from forest fires in Indonesia. The haze is an almost annual occurrence during the dry season from June to September, when monsoon winds can shift it from Indonesia towards the Malay Peninsula and Singapore, creating a thick haze that can last for weeks and cause a range of environmental, social, and economic issues.
| Characteristics | Values |
|---|---|
| Cause | Forest fires, land clearing for agriculture, slash-and-burn culture |
| Affected regions | Southeast Asian countries including Singapore, Malaysia, Brunei, Thailand, Indonesia, and the Malay Peninsula |
| Environmental consequences | Deforestation, soil erosion and degradation, global warming, threats to biodiversity |
| Societal consequences | Regional tension, health risks, economic and productivity losses, food insecurity |
| Treaties and agreements | ASEAN Agreement on Transboundary Haze Pollution (2002), Transboundary Haze Pollution Act (Singapore, 2014) |
| Monitoring and prevention | Joint haze monitoring system approved by ASEAN leaders in 2013 for $100,000 |
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What You'll Learn

The ASEAN Agreement on Transboundary Haze Pollution
Haze pollution is a recurring issue in Southeast Asian countries, including Singapore, Malaysia, Brunei, and Thailand. The pollution is largely caused by forest fires in Indonesia, which are often the result of slash-and-burn practices. This has led to severe environmental and societal consequences, including deforestation, soil erosion, global warming, threats to biodiversity, regional tension, health risks, and economic losses.
To address this issue, the ASEAN Agreement on Transboundary Haze Pollution was signed in 2002 by the member states of the Association of Southeast Asian Nations. This legally binding environmental agreement aims to reduce haze pollution in Southeast Asia. The agreement recognizes that transboundary haze pollution, resulting from land and/or forest fires, requires mitigation through coordinated national efforts and international cooperation.
The implementation of the agreement is managed by the Ministers of Environment and other representatives from the respective ASEAN countries. To support this, two sub-regional ministerial steering committees were established to address haze-related issues in the northern and southern ASEAN regions: the Sub-regional Ministerial Steering Committee on Transboundary Haze Pollution (MSC) and the Sub-regional Ministerial Steering Committee on Transboundary Haze Pollution in the Mekong Sub-region (MSC-Mekong). Additionally, the ASEAN Task Force on Peatlands (ATFP) was set up in September 2013 to assist in monitoring and implementing the agreement.
The agreement has faced challenges due to the ASEAN style of regional engagement, which prioritizes national sovereignty, leading to states acting in their self-interest. However, as of September 2014, all ten ASEAN countries had ratified the agreement, demonstrating a collective commitment to addressing the haze pollution crisis that affected the region in the late 1990s.
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Forest fires and slash-and-burn culture in Indonesia
Transboundary haze pollution is an environmental issue that affects Southeast Asian countries, particularly Singapore, Malaysia, Brunei, and Thailand. It is caused by forest fires resulting from extensive slash-and-burn practices in Indonesia.
Indonesia's forests are essential for biodiversity and are a key factor in the country's economic development and cultural heritage for Indigenous communities. However, these forests are under constant threat due to rampant forest fires, with the country experiencing a significant surge in wildfires in 2023. During that year, the total area burned reached 1.16 million hectares, a fivefold increase from 2022. Human activities, driven by social and cultural factors, are responsible for 98% of these fires. The primary motive is to clear land for crops, especially oil palm plantations, as fire is a cheaper and easier method.
The slash-and-burn culture in Indonesia has severe environmental and societal consequences. Deforestation, soil erosion, degradation, global warming, and threats to biodiversity are among the environmental impacts. The haze caused by these fires leads to regional tensions, health risks, economic losses, productivity losses, and food insecurity.
Indonesia's government has implemented interventions and regulations to control and limit forest burning for commercial gain. They have sealed land operated by 30 companies and brought criminal charges against four of them. Additionally, authorities in West Kalimantan have tightened rules to curb slash-and-burn clearances by plantation companies. However, concerns remain about the Indonesian government's ability to effectively monitor and implement changes to address the issue.
The ASEAN Agreement on Transboundary Haze Pollution, signed in 2002, is a legally binding treaty among Southeast Asian nations to reduce haze pollution. It recognizes the need for national efforts and international cooperation to mitigate transboundary haze pollution resulting from land and forest fires. Indonesia, as the primary haze-producing party, was the last ASEAN country to ratify the agreement in 2014.
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Transboundary haze and air pollution in Singapore
Transboundary haze pollution in Southeast Asia is largely attributable to forest fires in Indonesia, particularly on the Indonesian island of Sumatra. This is often caused by the slash-and-burn (S&B) method, which has detrimental environmental consequences, including deforestation, soil erosion, global warming, and threats to biodiversity.
Singapore is one of the Southeast Asian countries affected by transboundary haze pollution. In 2015, Singapore's air pollution levels were pushed to hazardous levels due to transboundary smoke, with a cost of $1.83 billion (USD). The 2015 haze was exacerbated by the weather phenomenon El Niño, which fuelled forest fires during Indonesia's dry season. Singapore has also experienced haze during the monsoon season when southwest monsoon winds shift the haze from Sumatra towards the Malay Peninsula and Singapore, sometimes lasting for weeks.
The haze has significant impacts on Singapore's households, leading to increased water and electricity consumption as people stay indoors to minimise exposure to health risks. It also disrupts transportation and increases public health costs for respiratory, eye, and skin conditions. Singapore's NEA closely monitors air pollution and provides residents with real-time air quality data, such as the Pollution Standards Index (PSI) and PM2.5 readings, to help them make informed decisions and manage their exposure.
To address transboundary haze pollution, Singapore enacted the Transboundary Haze Pollution Act in 2014 to penalize emissions that cause harm across national boundaries. Singapore has also offered to work directly with Indonesian farmers to encourage sustainable practices and minimise the problem at its source. Additionally, Singapore has adopted more stringent measures on vehicle emissions by implementing the Euro VI standards.
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The Singapore Transboundary Haze Pollution Act
Transboundary haze pollution is a severe issue that affects several Southeast Asian countries, including Singapore. It is primarily caused by rampant forest fires in Indonesia, often linked to the extensive slash-and-burn (S&B) culture and agricultural burning practices. The resulting haze, carried by monsoon winds, can lead to dangerous levels of air pollution, posing significant health, environmental, and economic risks.
To address this issue, Singapore enacted the Transboundary Haze Pollution Act (THPA) in 2014. This legislation is a crucial step in Singapore's efforts to combat transboundary haze pollution and hold responsible parties accountable. Here is a detailed look at the Act:
Overview:
The Transboundary Haze Pollution Act of 2014 is a statute of the Parliament of Singapore that specifically targets transboundary haze pollution affecting the country. The Act seeks to deter firms or entities, either based in Singapore or abroad, from engaging in activities that contribute to haze pollution impacting Singapore. It is important to note that the Act targets companies that pollute or condone pollution by other entities they manage.
Legal Actions and Enforcement:
The Act empowers Singapore to address transboundary haze pollution through legal means. It enables the National Environment Agency (NEA) of Singapore to issue legal notices to companies suspected of causing fires that contribute to haze pollution in Singapore. These notices hold companies directly accountable for transboundary pollution. The NEA can initiate investigations and enforce penalties, including fines and imprisonment, for non-compliance.
International Cooperation:
While the Act empowers Singapore to request information and take legal action independently, collaboration with other countries, particularly Indonesia, is vital for comprehensive enforcement. Singapore has expressed its intention to prosecute Indonesian companies found responsible for fires that cause haze pollution in Singapore, despite potential challenges and backlash from its neighbour.
Public Health and Safety:
The THPA plays a crucial role in safeguarding the health and safety of Singapore's residents. By targeting companies responsible for forest fires, the Act helps mitigate the adverse effects of air pollution on public health.
Preventive Measures:
The Act also includes provisions for preventive measures to mitigate haze pollution. It grants the relevant authorities the power to issue notices to entities, requiring them to take steps to prevent, reduce, or control haze pollution. This proactive approach aims to reduce the occurrence of haze pollution before it affects Singapore.
Civil Liability and Penalties:
The THPA establishes civil liability for entities causing haze pollution in Singapore. It outlines offences and penalties for non-compliance, empowering the authorities to take legal action against those contributing to haze pollution.
The Transboundary Haze Pollution Act of 2014 is a significant tool in Singapore's fight against transboundary haze pollution. By holding companies accountable, deterring polluting activities, and addressing public health concerns, the Act demonstrates Singapore's commitment to tackling this regional environmental challenge.
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Economic and societal consequences of haze pollution
Transboundary haze pollution is an environmental issue that occurs when smoke and other pollutants are carried by the wind from one country to another, causing reduced air quality and visibility in the affected regions. This type of pollution has been a particularly acute problem in Southeast Asian countries, with forest fires in Indonesia being a major source of haze affecting neighbouring countries such as Singapore, Malaysia, Brunei, and Thailand.
The economic and societal consequences of haze pollution are significant and far-reaching. Haze pollution has been shown to have negative impacts on economic vitality and fluctuations. It can reduce enterprise performance and block foreign direct investment, leading to economic losses and inhibited economic growth. Additionally, haze pollution can lower agricultural yield, further impacting the economies of affected regions.
Haze pollution also poses serious health risks to those exposed to it. The inhalation of smoke and other pollutants can cause respiratory issues and other health problems. This, in turn, can lead to increased demand for healthcare services and commercial health insurance. The risk perception of residents plays a crucial role in their demand for insurance, and access to timely and accurate environmental information is essential in mitigating these risks.
The recurrence of haze pollution can result in regional tensions and food insecurity. Additionally, haze can have negative impacts on biodiversity and contribute to global warming and climate change. The environmental consequences of haze pollution often have societal implications, affecting the social and economic fabric of the affected regions.
To address these economic and societal consequences, countries have implemented various measures. For example, Singapore enacted the Transboundary Haze Pollution Act in 2014 to penalize emissions that cause harm across national boundaries. Additionally, Singapore has worked directly with Indonesian farmers to encourage sustainable practices and minimize the occurrence of haze pollution.
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Frequently asked questions
Transboundary haze pollution is air pollution in the form of haze that crosses national borders. It is caused by forest fires, often linked to the practice of slash-and-burn agriculture and the clearing of land for industrial plantations.
Transboundary haze pollution is a recurring issue in Southeast Asian countries, including Singapore, Malaysia, Brunei, and Thailand. In 2019, transboundary haze from forest fires in Indonesia reached Singapore and Malaysia, leading to a noticeable decline in air quality.
Transboundary haze pollution has various environmental, social, and economic impacts. It contributes to deforestation, soil erosion, global warming, and threats to biodiversity. It also poses health risks and leads to increased household consumption of water and electricity as people try to mitigate these health risks. Additionally, it causes regional tensions and economic and productivity losses.










































