This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/kg d.w.) in shoreline and seabed sediments in the Narragansett Bay, Rhode Island, USA, during 2020-09-25 to 2021-06-03. Microplastics in the shoreline sediments were collected using a metal spoon while those in the seabed sediments were collected using a Van Veen grab sampler. Data on sediment dry weight (reported in unit of g) and individual counts of microplastic fibers, fragments and films are provided. This dataset contains the results from all 76 shoreline and 7 seabed sediment samples, in a spreadsheet format.

This study was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces kg-1 d.w.) concentration in deep sea sediments in the northeast Atlantic Ocean margins. Microplastics data was collected from 2019-08-03 to 2019-08-19 using a remotely operated vehicle aboard RV Celtic Explorer. This dataset contains the results from all 40 sampling efforts, in a spreadsheet format.

This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/m3 and items/km2) in the surface waters of Kingston Harbor, Jamaica collected from 2017-09-14 to 2017-12-15. Microplastics were collected using a Manta net with a mesh size of 335 μm, towed at 1 knot for 15 minutes. This dataset contains the results from all 32 surface water samples, in a spreadsheet format.

This study estimated the load of surface microplastics in the surface waters around Scotland from 2014-01-06 to 2020-01-18. Microplastics data were collected using neuston net aboard MRV Scotia, MRV Alba na Mara and RV Sir John Murray. This dataset contains the results from all 398 surface net tows, in a spreadsheet format.

This study was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces per 100 g of d.w.) concentration in benthic sediments in primary fishing grounds in the northeast Atlantic Ocean. Microplastics data was collected from 2020-06-07 to 2021-02-27 using a Day grab. This dataset contains the results from all 17 sampling efforts, in a spreadsheet format.

This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm) in the surface water (reported in unit of pieces/m3) and sediments (reported in unit of pieces kg-1 d.w.) of River Karnaphuli (a tidal confluence river in the southeast coast of Bangladesh) from 2019-09-07 to 2020-03-14. Microplastics in the surface water were collected using a manta net while those in the sediment were collected using an Ekman dredge. This dataset contains the results from all 45 surface water and 45 sediment samples, in a spreadsheet format.

This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm) in seawater (reported in unit of items/m3), and sediments (reported in unit of items/kg d.w.), in the Hangzhou Bay, China during 2020-09-11 to 2020-11-21. Microplastics in the seawater were collected using a plankton net while those in the sediment were collected using a sediment grab sampler. Data on hydrologic conditions in the study area were also collected. These include water depth (reported in unit of m), seawater temperature (reported in unit of oC), seawater dissolved oxygen (reported in unit of mg/L), seawater pH, and seawater salinity (reported in unit of ‰). This dataset contains the results from all 26 seawater, and 26 sediment samples, in a spreadsheet format.

This study estimated the monthly concentration of microplastics (i.e. plastics measuring less than 5mm) in surface water (reported in units of items/L) and sediments (reported in unit of items/kg d.w.) in six sampling sites along the Thoothukudi region, south Tamil Nadu, southeast India, during 2021-01-03 to 2021-12-08. Microplastics in the surface water were collected with a plankton net while those in the sediments were collected using a shovel. This dataset contains the results from all 72 surface water and 72 sediment samples, in a spreadsheet format.

This study was carried out to estimate the floating microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/m^3) concentration in the South Pacific subtropical gyre. Microplastics data were collected with manta nets during an expedition that occurred between 2011-03-28 to 2011-04-21. This dataset contains the results from all 48 sampling stations, in a spreadsheet format.