This study estimated the concentration of microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/kg d.w.) on beaches along the eastern Gulf of Thailand from 2019-04-11 to 2019-05-28. Microplastic data were collected using a metal spoon. This dataset contains the results from all 34 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/m^3) concentration in surface waters along Manila Bay, Philippines from 2018-10-07 to 2019-02-11. A metallic bucket was used to collect water from 0 to 12 cm below the surface water. Water from the bucket was poured unto stacked stainless sieves with varying mesh sizes. Microplastics were identified and counted under a stereo microscope. This dataset contains the results from all 5 sampling stations, in a spreadsheet format.

This study estimated the concentration of surface microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/m3) in the Salento coastal seas (Southern Puglia, Italy) from 2020-10-17 to 2021-06-28. Microplastic data were collected aboard R/V Pelagia using a manta net. This dataset contains the results from all 18 surface water samples, in a spreadsheet format.

This study estimated the abundance of microplastics (i.e., plastics measuring less than 5mm) on marine turtle nesting beaches during 2018-08-04 to 2020-01-24. Samples were collected with metallic trowel. Sand samples were collected from 209 sites spanning six oceans and 39 countries by a global network of marine turtle scientists. Microplastics were extracted through stacked sieves, visually identified, and a sub-sample verified via Fourier-transform infrared spectroscopy. Microplastic particles were counted and weighed, which in combination with the dry sand sample weight and volume, allowed multiple units of measure to be calculated: Plastic weight per kg of dry sediment (g kg-1), plastic particle number per kg of dry sediment (particle kg-1), and plastic particle number per m-3 of dry sediment (particle m-3). Plastic particles were also categorized into five types: industrial plastic pellets, foams, fragments, sheetlike user plastics and threadlike user plastics. This dataset contains the results from all 209 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 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; reported in unit of items/kg d.w) in subtidal sediments from the Sado River estuary and the Arrábida marine park, Portugal collected from 2018-08-22 to 2019-02-27. Microplastics were collected using a petite Ponar benthic grab. This dataset contains the results from all 36 sediment samples, in a spreadsheet format.

This study was carried out to estimate the pelagic microplastics (plastics from size 0.5mm to 5mm, reported in unit of pieces/m^3) concentration in the North Atlantic Ocean. Microplastics data was collected from 2020-11-06 to 2020-11-29 aboard RV Pelagia, using a manta net. This dataset contains the results from all 36 sampling efforts, in a spreadsheet format.

This study assessed the load of surface microplastics (i.e. plastics less than 5mm, reported in unit of pieces/m^3) abundance at 124 sites in the Mediterranean Sea from 2014-06-03 to 2014-11-08. Microplastics data were collected aboard R/V Tara using manta net, towed at the top 10 cm of the sea surface with an average speed of 2.5-3 knots for 60 minutes. This dataset contains the results from all 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/m^3) concentration in the mid-North Pacific Ocean. Microplastics data was collected from 2019-09-19 to 2019-10-30 aboard RV XIANG YANG HONG 03. Microplastics samples were collected using manta net. This dataset contains the results from all 15 sampling stations, 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/m^3) concentration in the Algerian surface waters. Microplastics data was collected over four seasons from 2018-01-28 to 2018-11-29 using a manta net. This dataset contains the results from all 24 sampling stations, in a spreadsheet format.