Both types are recognized to persist in the environment at high levels, particularly in aquatic and marine ecosystems, where they cause water pollution. Such sources of secondary microplastics include water and soda bottles, fishing nets, plastic bags, microwave containers, tea bags and tire wear. Secondary microplastics arise from the degradation (breakdown) of larger plastic products through natural weathering processes after entering the environment. These include microfibers from clothing, microbeads, and plastic pellets (also known as nurdles). Primary microplastics include any plastic fragments or particles that are already 5.0 mm in size or less before entering the environment. Two classifications of microplastics are currently recognized. They cause pollution by entering natural ecosystems from a variety of sources, including cosmetics, clothing, and industrial processes. National Oceanic and Atmospheric Administration (NOAA) and the European Chemicals Agency. Microplastics are fragments of any type of plastic less than 5 mm (0.20 in) in length, according to the U.S.
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