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t i i . . . .. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . i i i i i i i i i i i i i . i >< i >< i >< i >< i >< i >< . r i . J . . i r i i i i i i i i i i J i J i J FRAGMENTING BY PHYSICAL AND CHEMICAL WEATHERING BIOLOGICAL FRAGMENTATION of plastic debris at sea Howmicroplastics are generated CONSUMER PRODUCTS MEDICAL APPLICATIONS H INDOOR PARTICULATE EMISSIONS URBAN AND TRANSPORT INFRASTRUCTURE INTENTIONAL SHREDDING AND FRAGMENTING PLASTIC AGRICULTURE .. . . . . . . . . . . .. . . . . . . . . . . . . Primary source (Human activities) Secondary source (Natural processes)SOURCES