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 estimated the concentration of microplastics (i.e. plastics measuring less than 5mm) in the surface water (reported in unit of pieces/m3), beach sediments (reported in unit of pieces/m3), and crude salt (reported in unit of pieces/kg), in the northern Bay of Bengal, Bangladesh coast during 2019-03-22 to 2020-01-05. Microplastics in the surface water were collected using a manta net while those in the sediment and crude salt were collected using a trowel. This dataset contains the results from all 18 surface water, 60 sediment, and 27 crude salt 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 microplastics (i.e. plastics measuring less than 5mm; reported in unit of items/kg d.w) in beach sediments along the Thoothukudi coast, Gulf of Mannar region, India, during 2021-01-03 to 2021-06-08. Microplastics in the sediments were collected using a shovel. This dataset contains the results from all 36 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 was carried out to estimate the microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/m^3) concentration in the Bay of Bengal and South Pacific Ocean. Microplastics data was collected from 2013-05-27 to 2015-11-04. The Bay of Bengal expedition was aboard SV Mir while the South Pacific Ocean expedition was aboard RV Cabo de Hornos. During the two expeditions, the study investigated whether the microplastics sampling instruments, the new, high-speed AVANI trawl (All-purpose Velocity Accelerated Net Instrument) collected similar amounts and types of microplastics as two established scientific trawl designs, the manta trawl and the neuston net. The AVANI trawl can collect microplastics from the sea surface at relatively higher speeds up to 8 knots and during long transits (allowing for a nearly continuous sampling effort over long distances), whereas the manta and neuston trawls must be towed slowly in a less turbulent sea state and often represent shorter tow lengths. This dataset contains the results from all 36 sampling stations in the Bay of Bengal and 52 sampling stations in the South Pacific Ocean, 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 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 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 estimated the concentration of microplastics (i.e. plastics measuring less than 5mm, reported in unit of pieces/kg d.w.) on beaches along the western Gulf of Thailand during 2019-09-22. Microplastic data were collected using a metal spoon. This dataset contains the results from all 25 beach samples, in a spreadsheet format.