This classification is based on the thresholds detailed in GESAMP report # 99 on recommendation from the SDG 14 indicator team. While the definition is in accordance with the common use of this term (as per GESAMP report # 99), alternative size classifications exist. An alternative classification is a piece of plastic which has a diameter less than 100 nanometres. The GESAMP report states that it assumes a spherical shape for this size classification, which was understood to mean the generalised form of diameter, i.e. the largest distance between two points belonging to an object.
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