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Human Health Effects
19,869 resultsAccumulation of Microplastic on Shorelines Woldwide: Sources and Sinks
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Researchers found microplastic contamination on shorelines across all six continents, with higher concentrations near densely populated areas. A major source appears to be synthetic clothing fibers released during laundry, with a single garment shedding over 1,900 fibers per wash that pass through wastewater treatment and end up in the ocean.
River plastic emissions to the world’s oceans
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Researchers built a global model to estimate how much plastic waste enters the ocean from rivers, combining data on waste management, population density, and water flow patterns. They estimated that rivers deliver between 1.15 and 2.41 million tonnes of plastic to the oceans annually, with over 74% of emissions occurring between May and October. The top 20 polluting rivers, mostly in Asia, accounted for 67% of the global total, providing key data for targeting cleanup and prevention efforts.
Emerging threats and persistent conservation challenges for freshwater biodiversity
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This review provides a comprehensive overview of microplastic pollution in freshwater environments, covering sources, distribution, and ecological impacts in rivers, lakes, and reservoirs. Researchers found that freshwater microplastic contamination is widespread globally but that standardized sampling and analysis methods are still lacking. The study calls for more consistent research approaches so that contamination levels across different water bodies can be meaningfully compared.
Plastic and Human Health: A Micro Issue?
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This review evaluates the potential human health impacts of microplastic exposure through food and air, drawing on evidence from particle toxicology and related fields. Researchers note that if inhaled or ingested, microplastics could accumulate in tissues and cause localized inflammation, while chemical additives and adsorbed pollutants may leach out and cause additional toxic effects. The paper emphasizes that chronic, long-term exposure is likely the greater concern, though current data on actual human exposure levels remains limited.
Microplastic Ingestion by Zooplankton
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This study examined whether tiny marine animals called zooplankton can ingest microplastics, and researchers found that thirteen different zooplankton species consumed plastic beads of various sizes. The plastics also stuck to the animals' outer shells and significantly reduced their normal feeding on algae, suggesting that microplastic pollution could disrupt the base of the marine food web.
Are We Speaking the Same Language? Recommendations for a Definition and Categorization Framework for Plastic Debris
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This review examines the full lifecycle of microplastic pollution, from how plastics enter waterways to how they degrade and interact with ecosystems. Researchers found that microplastics serve as carriers for chemical pollutants and pathogens, and that their small size allows them to be ingested by a wide range of organisms across the food chain. The study emphasizes that understanding the fate and transport of microplastics is essential for developing effective pollution mitigation strategies.
Human Consumption of Microplastics
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Researchers evaluated the American diet and estimated that the average person consumes between 39,000 and 52,000 microplastic particles per year through food alone, with the number rising significantly when inhalation and bottled water consumption are included. The study analyzed data from 26 prior studies covering common food categories. The findings highlight that microplastic exposure through everyday eating and drinking is widespread and substantial.
Environmental exposure to microplastics: An overview on possible human health effects
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This review examines the potential health effects of human exposure to microplastics through ingestion, inhalation, and skin contact. Researchers found that microplastic exposure may cause oxidative stress, inflammation, and immune system disruption, with the body's inability to break down synthetic particles potentially leading to chronic inflammation. The study emphasizes that while evidence of harm is growing, microplastic toxicity varies greatly depending on particle properties, concentration, and individual susceptibility.
Microplastics in freshwaters and drinking water: Critical review and assessment of data quality
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Researchers critically reviewed fifty studies on microplastics in freshwater and drinking water and found significant quality issues, including inconsistent sampling methods and inadequate contamination controls. Many studies lacked proper quality assurance, making it difficult to draw reliable conclusions about actual contamination levels. The study emphasizes that standardized methods are urgently needed before the true extent of microplastic contamination in drinking water can be assessed.
Ingested Microscopic Plastic Translocates to the Circulatory System of the Mussel, Mytilus edulis (L.)
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Researchers discovered that microplastic particles ingested by mussels can move from the gut into the circulatory system within three days and persist in the body for over 48 days. Smaller particles accumulated more readily than larger ones, suggesting that as plastic debris breaks down into ever-smaller fragments in the environment, the potential for it to build up inside living organisms increases.
Microplastics as an emerging threat to terrestrial ecosystems
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This paper highlights microplastics as an overlooked threat to terrestrial ecosystems, noting that most plastic pollution originates on land before reaching the oceans. Researchers discuss evidence that microplastics interact with soil organisms, fungi, and pollinators that provide essential ecosystem services. The study calls for urgent research into how microplastics affect land-based environments, which may be experiencing significant but understudied ecological impacts.
Waste Mismanagement in Developing Countries: A Review of Global Issues
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This narrative review examines the global environmental and social consequences of solid waste mismanagement in developing countries, documenting how open dumping and burning drive marine litter, air and soil contamination, and serious health risks for informal waste pickers, while calling for integrated waste collection and treatment systems to address these interconnected crises.
Uptake and Accumulation of Polystyrene Microplastics in Zebrafish (Danio rerio) and Toxic Effects in Liver
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Researchers exposed zebrafish to polystyrene microplastics of two different sizes and tracked where the particles accumulated in the body. They found that smaller particles (5 micrometers) built up in the gills, liver, and gut, while larger particles (20 micrometers) mainly stayed in the gills and gut. The microplastics caused liver inflammation, oxidative stress, and disrupted fat metabolism, suggesting that ingested microplastics can damage internal organs in fish.
Microplastics Can Change Soil Properties and Affect Plant Performance
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Researchers tested six different types of microplastics in soil and found that they altered key soil properties including water-holding capacity, bulk density, and microbial activity. These changes in soil structure had cascading effects on plant growth, with some microplastic types reducing above-ground biomass. The study demonstrates that microplastics can fundamentally change how soil functions, with consequences for plant health and ecosystem stability.
A Detailed Review Study on Potential Effects of Microplastics and Additives of Concern on Human Health
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This detailed review examines the potential health effects of microplastics and the chemical additives they contain, which can include plasticizers, flame retardants, and stabilizers. Researchers describe how humans are exposed to these hazardous chemicals through ingestion, inhalation, and skin contact as microplastics break down in the environment. The study emphasizes that the combination of physical particle effects and chemical toxicity makes microplastics a uniquely complex health concern.
Oyster reproduction is affected by exposure to polystyrene microplastics
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Researchers exposed Pacific oysters to polystyrene microplastics during their reproductive period and found significant impacts on their ability to reproduce. Exposed oysters produced fewer and smaller egg cells and slower-swimming sperm, resulting in fewer offspring that also developed more slowly. The study demonstrates that microplastic pollution could threaten the reproductive success of commercially and ecologically important shellfish populations.
Microplastics in Seafood and the Implications for Human Health
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This review examines how humans are exposed to microplastics through seafood consumption and discusses the potential health implications. Researchers note that shellfish and small fish eaten whole pose the greatest concern because the entire digestive tract, where microplastics accumulate, is consumed. The evidence suggests that any toxicity depends on factors like particle size, polymer type, and the chemicals attached to the plastic surfaces.
Are Agricultural Soils Dumps for Microplastics of Urban Origin?
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Researchers investigated whether agricultural soils serve as dumping grounds for urban-origin microplastics, finding evidence that sewage sludge application and atmospheric deposition deliver city-sourced plastics to farmland.
Uptake and Effects of Microplastics on Cells and Tissue of the Blue Mussel Mytilus edulis L. after an Experimental Exposure
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Researchers exposed blue mussels to high-density polyethylene microplastics and found the particles were drawn into the gills and digestive system within just three hours. The microplastics triggered a strong inflammatory response and damaged cell membranes, providing direct evidence that microplastics can enter animal cells and cause significant tissue-level harm.
Airborne microplastics: Consequences to human health?
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Researchers reviewed existing evidence on airborne microplastics and their potential effects on human respiratory health. Studies of workers exposed to plastic fibers and particles have documented airway inflammation and breathing difficulties, suggesting that susceptible individuals may face health risks even from environmental concentrations. The paper calls for greater awareness and future research into the health consequences of inhaling microplastic particles.
Marine microplastic debris: An emerging issue for food security, food safety and human health
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This review examines the evidence for microplastic contamination in seafood and discusses what it means for food security and human health. Researchers found that microplastics have been detected in commercially important fish and shellfish species worldwide, but the actual health risks to humans from consuming contaminated seafood remain poorly understood. The study identifies critical knowledge gaps and calls for standardized methods to better assess the dietary exposure and potential toxicity of microplastics.
Anthropogenic debris in seafood: Plastic debris and fibers from textiles in fish and bivalves sold for human consumption
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Researchers examined fish and shellfish sold for human consumption in markets in Indonesia and California and found anthropogenic debris, including microplastic fibers and fragments, in every species tested. Fish tended to contain debris in their gastrointestinal tracts, while shellfish, which are eaten whole, contained it in their edible tissues. The findings raise direct concerns about human exposure to microplastics and textile fibers through everyday seafood consumption.
Microplastic as a Vector for Chemicals in the Aquatic Environment: Critical Review and Model-Supported Reinterpretation of Empirical Studies
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Researchers critically reviewed the widespread hypothesis that microplastics transfer harmful chemicals to marine animals after being ingested. Using new modeling calculations, they found that for most organisms in most scenarios, the contribution of microplastics to chemical exposure is actually very small compared to what animals absorb through water and food. The study suggests that while microplastics are a legitimate environmental concern, their role as a significant chemical delivery vehicle has been overstated in much of the scientific literature.
Wear and Tear of Tyres: A Stealthy Source of Microplastics in the Environment
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This paper compiles existing knowledge on tire wear as a major but often overlooked source of microplastics, estimating global per-person emissions at about 0.8 kilograms per year. Tire particles enter waterways, air, and soil, with an estimated 5-10% of ocean plastic pollution originating from tire wear. The study calls for increased awareness and creative solutions to address this stealthy yet substantial contributor to microplastic contamination.