Microplastics in Cox’s Bazar, Bangladesh – Occurrence, Characteristics, and Risk Implications

Cox’s Bazar, renowned for its long sandy beach and vibrant tourism industry, faces increasing environmental challenges due to plastic pollution. Microplastics—tiny plastic particles less than 5 mm—have emerged as a significant pollutant affecting coastal sediments and groundwater. Recently Ahmed et al. 2026 reported on the prevalence and potential hazards of MPs in surface sediment and shallow groundwater samples collected from 12 sites in Cox's Bazar, Bangladesh, from August to October 2023. Using stereomicroscopy and FTIR, MPs were quantified, with concentrations ranging from 60 to 813.33 MPs/kg in surficial sediment and 3.34 to 36.66 MPs/L in shallow groundwater, with mean values of 294.38 ± 26.61 MPs/kg and 18.91 ± 4.75 MPs/L. This report explores the occurrence, characteristics, and potential risks associated with microplastics in this region, highlighting the urgent need for sustainable waste management practices.

Dr. Hossain (muzammel3@gmail.com) is seeking a fellowship, grant for microplastics research.  

Occurrence of Microplastics

In Coastal Sediments

High Plastic Waste Input: The region experiences substantial plastic waste from tourism, fishing activities, and local communities.

Sediment Contamination: Microplastics are prevalent in the seabed sediments, accumulating over time due to ocean currents and sedimentation processes.

Sources: Fragmentation of larger plastic debris, fishing gear, and mismanaged waste contribute to sediment contamination.

In Shallow Groundwater

Infiltration Pathways: Microplastics enter shallow groundwater through surface runoff, leachates, and wastewater discharge.

Detection: Recent studies indicate the presence of microplastics in groundwater sources used for drinking and domestic purposes, raising health concerns.

Characteristics of Microplastics

Size & Shape: Predominantly fibers and fragments, varying in size from visible particles to microscopic scales.

Polymer Types: Mainly polyethylene (PE), polypropylene (PP), and polystyrene (PS), reflecting local plastic consumption patterns.

Color & Composition: Microplastics exhibit diverse colors, often matching common plastic products like bottles, caps, and fishing gear.

Surface Traits: Many microplastics show biofouling—colonization by microorganisms—affecting their transport and environmental interactions.

Risk Implications

Environmental Risks

Disruption of benthic ecosystems due to ingestion by sediment-dwelling organisms.

Alteration of sediment chemistry and physical properties, impacting habitat quality.

Human Health Risks

Potential ingestion of microplastics through contaminated groundwater sources.

Microplastics may carry toxic chemicals and pathogens, posing health hazards when ingested.

Ecological Risks

Microplastics act as vectors for persistent organic pollutants (POPs), bioaccumulating in marine and terrestrial food webs.

Impact on fisheries and local livelihoods dependent on seafood.

Evidence from Cox’s Bazar

Recent environmental assessments reveal significant microplastic concentrations in coastal sediments.

Detection of microplastics in shallow groundwater sources suggests infiltration from land-based sources.

The findings underscore the need for comprehensive policies targeting waste reduction, plastic recycling, and water quality monitoring.

Conclusion

The presence of microplastics in Cox’s Bazar’s coastal sediments and groundwater poses serious environmental and health concerns. Addressing this issue requires integrated efforts involving community awareness, stricter waste management regulations, and scientific research to monitor and mitigate microplastic pollution.

Reference

Ahmed, M., Seddique, A.A., Manik, M., Jahid, SK.A., Hossain, M.M., Pastorino, P. (2026) Occurrence, Characteristics, and Risk Implications of Microplastics in Coastal Sediments and Shallow Groundwater: Evidence from Cox’s Bazar, Bangladesh.  Microplastics 5(2),64. https://doi.org/10.3390/microplastics5020064.