The biggest source of microplastics in California coastal waters? Car tires

(CNN)Cars may be doing more damage to our environment than we realized.

According to a study from the San Francisco Bay Microplastics Project, the biggest source of microplastic pollution in California’s coastal waters may come from car tires.
Microplastics are defined by the National Oceanic and Atmospheric Association (NOAA) as fragments of plastic that are less than 5 mm in length (think the size of a sesame seed).
    Microplastics have been found in the stomachs of a number of marine organisms, and chemical additives from microplastics can also bleed out into the ocean, according to the NOAA. It is also possible that contaminants from the water may adhere to microplastics.
    The NOAA has not yet been determined if these contaminants transfer through the food chain.
    The San Francisco Estuary Institute teamed up with the 5 Gyres Institute to complete a three-year study in what they claim is the first comprehensive regional study of microplastic pollution.
    The study found that more than 7 trillion pieces of microplastics wash into the San Francisco Bay each year, with much of it coming from tire particles that were left behind on streets.
    Those 7 trillion pieces of microplastics are 300 times greater than the discharge that comes from all wastewater treatments plants discharging into San Francisco Bay annually.
      The study of microplastic pollution is a relatively new field, and microplastics are difficult to study because their size and seemingly endless sources. There is no accepted standard for sample collection, processing, analysis and reporting.
      The San Francisco Bay Microplastics Project aims to contribute to the development of those standards, to discover a baseline for future monitoring and to ultimately facilitate policy options with recommendations on the reduction of microplastics.

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