Helena Joyce
The Baltic Sea is often referred to as the world's most polluted sea, but it is difficult to confirm this with certainty. However, there is no doubt that it is one of the most polluted seas in the world. The Baltic Sea is an inland sea with limited water exchange, causing toxins and other pollutants to remain in the water for extended periods. Eutrophication, driven by excess nutrient loads, is the most critical environmental challenge facing the Baltic Sea, leading to severe ecological imbalances. These nutrients, such as nitrogen and phosphorus, act as fertilizers, promoting excessive growth of algae and aquatic plants. The sources of pollution include industrial waste, agricultural runoff, municipal waste, and atmospheric deposition. Additionally, urban litter, microplastics, and remnants from historical conflicts contribute to the pollution of the Baltic Sea.
| Characteristics | Values |
|---|---|
| Eutrophication | Driven by excess nutrient loads, this is the most critical environmental challenge facing the Baltic Sea. |
| Sources of Eutrophication | Agricultural runoff, urban runoff, natural background sources, industrial waste, municipal waste, atmospheric inputs, and agricultural activities. |
| Algal blooms | Eutrophication causes algal blooms, depleting oxygen and making the water dark and murky. |
| Hazardous substances | Heavy metals, persistent organic pollutants (POPs), pharmaceuticals, DDT, PCBs, mercury, microplastics, pharmaceutical residues, dioxins, flame retardants, and oil spills. |
| Marine litter | Plastics, packaging, fishing gear, microplastics, and nanoparticles. |
| Climate change | The Baltic Sea is warming rapidly, and massive algae growth often prevents it from being suitable for bathing. |
| Overfishing | Stocks of species like Baltic Cod have collapsed, disturbing the fishing industry across the region. |
| Chemical contamination | Chlorinated compounds from cellulose manufacturing and paper mills contaminated coastal waters until the 1980s, and remnants from World War II remain in the sea. |
| Water exchange | The Baltic Sea is almost totally surrounded by land, with limited water exchange, causing pollutants to remain in the water for longer. |
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What You'll Learn
Eutrophication and oxygen depletion
Eutrophication is the most critical environmental challenge facing the Baltic Sea. It occurs when there is an excessive amount of nutrients, such as nitrogen and phosphorus, in the water. These nutrients act as fertilisers, boosting the growth of algae and other aquatic plants. While nutrients are essential for life, an overabundance can lead to environmental imbalances.
The Baltic Sea is particularly susceptible to eutrophication due to its limited water exchange with the North Sea. As an inland sea, it has a very slow water turnover, which means that toxins and other pollutants remain in the water for a long time. This has been made worse by human activities, particularly since the 1950s and 1960s, with the expansion of farming, industries, transport, growing cities, and other sea-based activities in the region.
Agricultural runoff is the largest human-caused contributor to eutrophication in the Baltic Sea. Significant nutrients are released into waterways through runoff from fertilisers and animal waste. Urban runoff from streets and lawns also contributes to nutrient loads, as do wastewater treatment plants and shipping. Natural background sources, such as soil erosion and rock weathering, also play a role, but they must be distinguished from anthropogenic sources to effectively manage eutrophication.
The consequences of eutrophication in the Baltic Sea are severe. One of the most visible and detrimental effects is harmful algal blooms, especially cyanobacteria or blue-green algae. These blooms can cover up to 200,000 km2 every summer, impacting marine life, human health, and regional economies. They also contribute to eutrophication by adding nitrogen to the system, further stimulating sediment oxygen demand and leading to hypoxia.
Oxygen depletion, or hypoxia, is a well-documented phenomenon in the Baltic Sea, with both its spatial extent and intensity known to have increased due to anthropogenic eutrophication. The lack of oxygen at the seabed caused by eutrophication damages the food web and puts biodiversity in the Baltic Sea at risk. As of 2009, at least 115 sites in the Baltic Sea had experienced hypoxia since 1955, with the coastal zone containing over 20% of all known hypoxic sites worldwide.
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Hazardous substances
The Baltic Sea is one of the most polluted seas in the world. It is burdened by hazardous substances, including heavy metals, persistent organic pollutants (POPs), emerging contaminants like pharmaceuticals, DDT, PCBs, mercury, microplastics, pharmaceutical residues, dioxins, flame retardants, and oil spills. These substances are toxic, difficult to break down, and can persist in ecosystems and living organisms. The sea's limited water exchange, caused by its semi-enclosed location, allows pollutants to accumulate over time.
The sources of these hazardous substances are primarily land-based human activities, including industrial waste, municipal waste, agricultural runoff, and atmospheric deposition. Industrial activities contribute hazardous substances such as petroleum pitch, untreated waste from oil shale mining, and poisonous chlorinated compounds from cellulose manufacturing and paper mills. These substances contaminate rivers and the sea itself, impacting the ecosystem and human health.
Agricultural runoff introduces excess nutrients like nitrogen and phosphorus, leading to eutrophication and severe ecological imbalances. Urban runoff from streets and lawns also contributes to nutrient loads. Atmospheric inputs, mainly from traffic and agriculture, release pollutants into the air that eventually reach the sea.
Addressing the issue of hazardous substances in the Baltic Sea requires a comprehensive approach. Stricter regulations, improved wastewater treatment, and sustainable practices in agriculture and industry are crucial to reducing pollution. The Helsinki Commission (HELCOM) has been working towards reducing dangerous pollutants and has achieved positive results in some areas.
The presence of hazardous substances in the Baltic Sea poses risks to marine life, human health, and regional economies. It is important to recognize that the consequences of historical emissions will persist due to the slow water exchange. Efforts to restore the ecological balance and protect the fragile ecosystem of the Baltic Sea are ongoing, and there is hope for a positive impact through coordinated regional initiatives.
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Marine litter
The sources of marine litter in the Baltic Sea are diverse and include municipal and industrial waste, agricultural runoff, and atmospheric deposition from traffic and agriculture. Rivers flowing into the Baltic Sea also carry waste from population centres, industry, and agriculture, contributing to the pollution. The European Union (EU) has implemented strategies to address this issue, such as the EU Strategy for the Baltic Sea Region (EUSBSR), which aims to strengthen cooperation between the countries bordering the sea.
Litter in the Baltic Sea comes in various forms, with plastic waste being a significant concern. Bottles, cans, plastic bags, and other waste items are commonly found along the coast, and plastic waste swirls have been observed in the sea. Microplastics, defined as plastic particles between 2 and 5 millimetres in size, are also prevalent in the Baltic Sea. A sand rake method survey found that 69.9% of the litter pieces collected were in the microplastic size range.
In addition to plastic pollution, the Baltic Sea is affected by other types of marine litter. Industrial pellets were the most common type of litter found in the sand rake survey, accounting for 19.8% of the total litter pieces. Cigarette butts and paraffin were also significant contributors to marine litter, making up 15.3% and 11.9% of the total, respectively. The presence of these litter items poses a threat to the unique ecosystems supported by the Baltic Sea.
Efforts are being made to reduce marine litter and improve the health of the Baltic Sea. The Helsinki Commission (HELCOM), founded in 1974, coordinates and enforces the Baltic monitoring program and international research projects. The EU is also taking steps to remove pollutants, such as through the "Fit for REACH" project, which aims to replace harmful chemical substances with safer alternatives in industrial production processes.
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Climate change
The Baltic Sea is one of the most polluted bodies of water in the world. It is severely affected by general threats like biodiversity loss and climate change, and local pressures such as eutrophication, overfishing, and elevated levels of contaminants.
The sea is almost entirely surrounded by land, making it more vulnerable to pollution than other marine areas. Municipal and industrial waste, as well as atmospheric inputs from traffic and agriculture, are all sources of pollution that directly enter the sea or flow into it via rivers. The increase in inorganic plant nutrients (NH3, NOx, PO4) has caused eutrophication and consequent oxygen depletion in coastal bottom waters and the open sea. This has led to the production of hydrogen sulfide by bacteria, which can destroy bottom fauna. Climate change is exacerbating these issues, with rising water temperatures affecting the sea's ecosystems, water quality, and coastal communities.
The Baltic Sea's limited water exchange means that toxins and other pollutants remain in the water for extended periods, accumulating over time. This includes harmful substances like DDT, PCBs, mercury, microplastics, pharmaceutical residues, dioxins, flame retardants, and oil spills. The slow water turnover also means that the consequences of historical emissions, such as the dumping of chemical munitions during World War II, will persist for a long time.
Addressing the issues in the Baltic Sea requires international cooperation and immediate action. Innovative solutions and sustainable practices are emerging, and initiatives like the EU's LIFE programme and the Helsinki Commission (HELCOM) are working to protect and restore the marine ecosystem. The implementation of advanced technologies in wastewater treatment plants is also improving water quality and reducing eutrophication.
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Pollution sources
The Baltic Sea is almost totally surrounded by land, which means that sources of marine pollution are located mainly inland. More than 80% of marine pollution comes from land-based activities. The southern part of the Baltic Sea Region is more densely populated, with predominant agriculture areas, which is a cause of this region’s greater pollution.
The sources of marine pollution are industrial, agricultural, and municipal waste inputs directly into the sea or via rivers, and atmospheric inputs mainly from traffic and agriculture. The increase of nutrients (phosphorus and nitrogen compounds) caused eutrophication and consequently, oxygen depletion in the bottom of coastal waters as well as in the depths of the open sea. Eutrophication is driven by excess nutrient loads, which leads to severe ecological imbalances, harming marine life and human activities alike. These nutrients act as fertilizers, boosting the growth of algae and other aquatic plants. While nutrients are essential for life, an overabundance can lead to environmental imbalances.
Agriculture is the largest human-caused contributor, releasing significant nutrients into waterways through runoff from fertilizers and animal waste. Urban runoff, from areas like streets and lawns, also contains pollutants that contribute to nutrient loads. Natural background sources, such as soil erosion, rock weathering, and non-anthropogenic atmospheric deposition, significantly contribute to nutrient loading in the Baltic Sea.
Marine litter is another significant source of pollution, which primarily consists of plastics, including packaging, fishing gear, and microplastics. These pollutants threaten marine life, human health, and regional economies. They originate from human activities and enter the sea through wastewater treatment plants, surface runoff, and airborne deposition.
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Frequently asked questions
Yes, the Baltic Sea is one of the most polluted seas in the world.
The Baltic Sea is almost entirely surrounded by land, so most of the pollution comes from human activities on land. These include industrial, agricultural, and municipal waste, as well as atmospheric inputs from traffic.
The Baltic Sea is polluted with hazardous substances such as heavy metals, persistent organic pollutants (POPs), pharmaceuticals, microplastics, nanoparticles, and larger litter. There are also remnants from the Second World War, including chemical munitions and other war material.
Pollution in the Baltic Sea has led to eutrophication, which is an ecological imbalance caused by excessive nutrients such as nitrogen and phosphorus. This results in oxygen depletion and harms marine life, such as the collapse of Baltic Cod stocks, and human activities. It also makes the water dark and murky due to algal blooms.
Efforts are being made to reduce pollution and restore the Baltic Sea's ecological balance. The Helsinki Commission (HELCOM) has coordinated the Baltic Sea Action Plan, which has led to the reduction of dangerous pollutants and the regeneration of flora and fauna in some areas. Additionally, local stakeholders in the 1,500 municipalities in the Baltic Sea watershed are working to address the issue.
