Meghan Hodges
Transboundary pollution is a type of pollution that originates in one country but can cause damage to another country's environment. It is not contained within the borders of a single nation and can be transported through water or air across hundreds or thousands of kilometres. Transboundary pollution can be caused by catastrophic events, such as the Chernobyl nuclear explosion, or the gradual creeping of industrial discharge that eventually impacts adjacent countries. It poses a challenge for environmental governance and has led to a shift towards more international levels of governance and cooperation. Transboundary pollution has become an increasingly important issue for politicians, economists, and natural scientists.
| Characteristics | Values |
|---|---|
| Definition | Transboundary pollution is pollution that originates in one country but causes damage in another country's environment by crossing borders through pathways like water or air. |
| Common Carriers | Water, air currents, and the ocean's currents. |
| Examples | The Chernobyl nuclear explosion, industrial discharge, marine pollution, forest fires, and upstream activities. |
| Treaties and Conventions | The Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter, The Convention for the Prevention of Marine Pollution by Dumping from Ships and Aircraft, Transboundary Watercourses Convention, Transboundary Industrial Accidents Convention, and the Protocol on Civil Liability for Damage and Compensation for Damage Caused by Transboundary Effects of Industrial Accidents on Transboundary Waters. |
| Organizations | EPA, ICAO, Arctic Council, and the Association of Southeast Asian Nations (ASEAN). |
| Initiatives | Operation Water Pollution, Task Force on Hemispheric Transport of Air Pollution (TF HTAP), and the North American Emission Control Area (ECA). |
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What You'll Learn
Transboundary air pollution
The concept of transboundary air pollution gained prominence in the 1950s when people began to theorize that air pollution could be transported over large distances and cross borders. However, it became a significant concern in the late 1960s and 1970s, with the UK's Clean Air Act of 1956 being an early response to the issue. Today, it is recognized that air pollution knows no boundaries, and countries are working together to address this global issue.
To address transboundary air pollution, international collaboration is essential. Agreements like the 1979 LRTAP Convention and the Minamata Convention on Mercury aim to reduce emissions and mitigate the impact of pollutants. Organizations like the US Environmental Protection Agency (EPA) and the World Health Organization are actively involved in monitoring and reducing transboundary air pollution through various initiatives and partnerships.
The impact of transboundary air pollution is widespread and detrimental. It affects the health and well-being of people worldwide, with 99% of the global population breathing air that exceeds World Health Organization guidelines. It also damages ecosystems, as pollutants accumulate in the environment and move up the food chain, making certain organisms harmful to humans. Addressing this issue requires continued global cooperation and the implementation of measures to reduce pollution emissions and improve air quality.
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Transboundary water pollution
The Arctic region is particularly vulnerable to transboundary water pollution. Arctic seabirds, for instance, transport human-made pollutants from the south, such as mercury and DDT, which concentrate in their droppings (guano). These pollutants can reach levels up to 60 times greater than at unaffected sites, and as guano is an important fertiliser in the Arctic, it serves as a mechanism for contaminants to enter the Arctic food web.
Addressing transboundary water pollution requires international cooperation and the implementation of global frameworks. The United Nations Economic Commission for Europe (UNECE) Water Convention provides a legal basis for transboundary water cooperation, aiming to strengthen the linkages between terrestrial, freshwater, and marine environments. However, as of 2024, only 43 out of 153 countries sharing transboundary waters had operational arrangements covering 90% or more of their shared water sources. This highlights the need for improved monitoring systems, data sharing, and cooperative management of shared waters and adjacent floodplains to protect ecosystem services and support sectors such as agriculture, industry, and water supply.
To promote sustainable development and peace, initiatives like the Water Convention and the Protocol on Water and Health are essential. Bangladesh, for instance, has become the first South Asian country to join the UN Water Convention, fostering improved cross-border cooperation. These efforts are vital to address the increasing water-related crises and build resilience to the impacts of climate change in vulnerable regions.
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Transboundary marine pollution
Transboundary pollution is the movement of pollution across national borders, impacting the environment of nations other than the origin of the pollution. Marine pollution is a significant example of transboundary pollution, as it involves numerous nation-states and countless sources of pollution. Marine transboundary pollution is caused by both on-shore and off-shore industrial processes that utilise the ocean as a waste disposal site.
Marine pollution can be transported over vast distances, and its impact is not limited to a single nation. This is particularly evident in the Arctic, where human-made pollutants from the south are carried by wind and deposited in the region. The droppings (guano) of Arctic seabirds, which contain high levels of pollutants such as mercury and DDT, further contribute to the concentration of contaminants in the Arctic environment.
Additionally, the Global Partnership on Marine Litter (GPML) addresses the global issue of marine litter, with 11 regional seas implementing Regional Marine Litter Action Plans. These action plans provide policy, regulatory, and technical measures for waste management, sustainable consumption, and production, as well as coordination among all actors to address land-based sources of marine pollution, including plastics.
The issue of remedies for transboundary marine pollution is also a critical aspect. Remedies often take the form of fines or measures to ensure compliance with best practices. However, the challenge lies in ensuring that the charges are sufficient to offset the costs of controlling and monitoring pollution to prevent transboundary impacts effectively.
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Transboundary industrial accidents
Transboundary pollution refers to pollution that does not remain contained within the borders of a single nation-state but travels across national borders. It can be transported through water or air across hundreds or thousands of kilometres. Transboundary pollution can be caused by catastrophic events, such as the Chernobyl nuclear explosion, or by the gradual build-up of industrial discharge that eventually impacts adjacent countries.
Industrial accidents can have severe consequences on human health and the environment, including in other countries. The Convention on the Transboundary Effects of Industrial Accidents, signed in 1992, aims to protect human health and the environment from the impacts of industrial accidents that cross national borders. The convention promotes international cooperation between countries before, during, and after such accidents. It covers four main elements: prevention, preparedness, response, and notification.
To prevent accidents, parties must identify hazardous operations within their borders that could have transboundary effects if an accident occurs. They must also share information about these activities with other parties. In terms of preparedness, the convention outlines how parties can maintain a high level of readiness to respond to industrial accidents, particularly if they spill over into another country. Hazardous operations must have both on-site and off-site contingency plans, and local residents should be informed and involved in the development of prevention and preparedness measures.
In the event of an industrial accident, the convention requires parties to take swift and effective steps to minimise the effects of the accident, including any transboundary impacts. Affected countries should work together to address the impacts and help one another. To enable a coordinated response, the convention calls for the establishment of special notification systems, including early warning mechanisms, information sharing, and assistance requests.
The Convention on the Transboundary Effects of Industrial Accidents is an important tool for addressing the challenges posed by industrial accidents that have consequences beyond national borders. By promoting international cooperation and outlining specific measures for prevention, preparedness, response, and notification, the convention seeks to protect human health and the environment from the transboundary effects of industrial accidents.
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Transboundary acid rain
Transboundary pollution is pollution that does not respect national borders. Instead, it travels across them, impacting countries other than the one in which it originated. This could be through water or air, and it can be carried across hundreds or thousands of kilometres.
Acid rain is a type of transboundary pollution. It is caused by emissions of sulphur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere, which are then transported by wind and air currents. These emissions react with water, oxygen, and other chemicals to form sulphuric and nitric acids, which fall to the earth as wet or dry deposition. Acid rain typically has a pH between 4.2 and 4.4, while normal rain has a pH of around 5.6.
Acid rain can have harmful effects on soil, forests, streams, and lakes, as well as human health. It can also turn lakes and streams acidic. Due to its ability to be transported over long distances by wind and air currents, acid rain is a problem that affects many nations, not just those closest to the sources of the emissions that cause it.
The issue of acid rain as a form of transboundary pollution has been recognised for several decades, leading to scientific and political collaboration and the implementation of policies to reduce air emissions and their impacts on ecosystems. For example, the United Nations' Economic Commission for Europe (UNECE) Convention on Long-range Transboundary Air Pollution, signed in 1979, has resulted in significant reductions in emissions of key air pollutants, including sulphur dioxide.
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Frequently asked questions
Transboundary pollution is the pollution that originates in one country but can cause damage in another country by crossing borders through pathways like water or air.
Some examples of transboundary pollution include acid rain, smog, haze, smoke, and downstream river or ocean pollution due to upstream activities. Marine pollution is another example, with pollutants being transported from the North Atlantic Ocean, the Middle East, and Africa to the South Asian region.
One challenge is that the liability for damage caused by transboundary pollution is typically owed from one state to another, while the nationals of states suffer the most damage. Additionally, there is a lack of a global governing body to enforce international policies, making it difficult to coordinate and cooperate across nations.
There have been various international agreements and conventions aimed at addressing transboundary pollution, such as the Convention on Long-Range Transboundary Air Pollution (LRTAP) and the Transboundary Watercourses Convention, which focuses on preventing, controlling, and reducing transboundary water pollution. The EPA in the United States has also been working to reduce transboundary air pollution through initiatives like the Task Force on Hemispheric Transport of Air Pollution (TF HTAP).
