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The Scottish Government currently monitors plastic pollution in the sea through microplastics in surface water, sea-floor litter, and beach litter. We have initiated work to collect data on plastic pollution in waterways though supporting and funding Keep Scotland Beautiful’s Upstream Battle project. The National Litter and Flytipping Strategy action plan contains a number of actions related to improving data capture on litter and flytipping, with the aim of improving our knowledge of these issues.

The Scottish Government microplastics monitoring programme began in 2013, and has undertaken annual surveys since that time. Microplastics are present in the surface waters of all Scottish Marine Regions, although have not been found to be present at all sample sites. Scottish Marine Regions next to the most urbanised and industrialised areas of the country have been shown to have higher concentrations of microplastics. Annual surveys continue to gather data, and would contribute to any baseline developed in the future.

Sea-floor litter data is collected during Scottish Government fish surveys which sample Scottish waters. There is now over 10 years of data, from 2012 onwards, which is used nationally and internationally as part of wider efforts to monitor changes in marine litter levels in the North-East Atlantic. There is evidence of an apparent decrease in litter density over time for some areas of Scotland’s seas.

The density and type of litter found on Scotland’s beaches has been recorded by the Marine Conservation Society since 1993. This data has been used by the Scottish Government to produce the pilot Scottish Beach Litter Performance Indicators. Beach litter loadings have been calculated for five sub-regions around the Scottish coastline. The amounts of litter found in the five sub-regions show a variety of trends, dependent on the litter type and location.

Information on these monitoring programmes has been published in Scotland’s Marine Assessment 2020 and can be found at https://marine.gov.scot/sma/assessment-theme/marine-litter

Research and monitoring shows that the majority of litter which ends up in the sea or in waterways has come from land-based sources. These sources include on-the-go food and drinks containers, sanitary items incorrectly disposed of through the sewer system, and flytipping. Maritime and aquatic sources also contribute to litter found at sea and in waterways, and these include maritime industries such as fishing, aquaculture, and shipping, as well as other sources such as angling.