Skip to main content
Sister Publication Links
  • Sustainable Plastics
  • Rubber News
Subscribe
  • Sign Up Free
  • Login
  • Subscribe
  • News
    • Processor News
    • Suppliers
    • More News
    • Digital Edition
    • End Markets
    • Special Reports
    • Newsletters
    • Videos
    • Podcasts
    • Injection Molding
    • Blow Molding
    • Film & Sheet
    • Pipe/Profile/Tubing
    • Rotomolding
    • Thermoforming
    • Recycling
    • Machinery
    • Materials
    • Molds/Tooling
    • Product news
    • Design
    • K Show
    • Mergers & Acquisitions
    • Sustainability
    • Public Policy
    • Material Insights Videos
    • Numbers that Matter
    • Automotive
    • Packaging
    • Medical
    • Consumer Products
    • Construction
    • Notable Leaders in Sustainability
    • Processor of the Year
    • Best Places to Work
    • Women Breaking the Mold
    • Rising Stars
    • Diversity
    • Most Interesting Social Media Accounts in Plastics
  • Opinion
    • The Plastics Blog
    • Kickstart
    • One Good Resin
    • Pellets and Politics
    • All Things Data
    • Viewpoint
    • From Pillar to Post
    • Perspective
    • Mailbag
    • Fake Plastic Trees
  • Shop Floor
    • Blending
    • Compounding
    • Drying
    • Injection Molding
    • Purging
    • Robotics
    • Size Reduction
    • Structural Foam
    • Tooling
    • Training
  • Events
    • Plastics News Events
    • Industry Events
    • Injection Molding & Design Expo
    • Livestreams/Webinars
    • Editorial Livestreams
    • Ask the Expert
    • Plastics News Events Library
    • Plastics News Executive Forum
    • Injection Molding & Design Expo
    • Plastics Caps + Closures: A Global Online Event
    • Women Breaking the Mold Networking Forum
    • Bioplastics Live
    • Numbers that Matter Live
    • PFAS Live
    • Plastics in Politics Live
    • PN Live: Mergers and Acquisitions
    • Polymer Points Live
    • Sustainable Plastics Live
    • Plastics Caps & Closures Library
    • Plastics in Healthcare Library
    • Women Breaking the Mold Networking Forum Library
  • Rankings & Data
    • Injection Molders
    • Blow Molders
    • Film Sheet
    • Thermoformers
    • Pipe Profile Tubing
    • Rotomolders
    • Mold/Toolmakers
    • LSR Processors
    • Recyclers
    • Compounders - List
    • Association - List
    • Plastic Lumber - List
    • All
  • Directory
  • Resin Prices
    • Resin Prices Overview
    • Commodity Thermoplastics
    • High Temperature Thermoplastics
    • Engineering Thermoplastics
    • Recycled Plastics
    • Thermosets
    • Europe - Virgin
    • Europe - Recycled
    • Europe - Feedstock
  • Custom
    • Sponsored Content
    • LS Mtron Sponsored Content
    • Conair Sponsored Content
    • KraussMaffei Sponsored Content
    • ENGEL Sponsored Content
    • White Papers
    • Classifieds
    • Place an Ad
    • Sign up for Early Classified
MENU
Breadcrumb
  1. Home
  2. News
June 12, 2020 04:51 AM

It’s raining plastic, say researchers

Karen Laird
Editor, Sustainable Plastics
Sustainable Plastics
  • Tweet
  • Share
  • Share
  • Email
  • More
    Reprints Print
    Janice-Brahney-03-UST.jpg
    Janice Brahney, Utah State University

    Microscope image of microplastics in atmospheric particulate samples. 500 pm. 

    A team of researchers at Utah State University, who collected samples of microplastics in 11 national parks and wilderness areas in the western part of the US, are appalled at what they found.

    The team examined weekly wet and monthly dry samples from these 11 sites. Using high-resolution atmospheric deposition data, the researchers, led by Utah State University Assistant Professor Janice Brahney, analyzed the samples to determine the composition of these plastics, identify their source and track their movement and fallout.

    They calculated that over 1000 tons of microplastics are deposited onto protected lands in the western U.S. each year, equivalent to more than 123 million plastic water bottles.

    "We were shocked at the estimated deposition rates and kept trying to figure out where our calculations went wrong," Brahney said. "We then confirmed through 32 different particle scans that roughly 4 percent of the atmospheric particles analyzed from these remote locations were synthetic polymers."

    Microplastics have long been known to accumulate in wastewaters, rivers, and ultimately the worlds' oceans. But, as Brahney's team shows, they also accumulate in the atmosphere, ultimately ending up in remote and protected environments through a phenomenon known as atmospheric deposition.

    Atmospheric deposition has often been described as the "cleansing" mechanism of the earth’s atmosphere is called. Airborne particles, gases, pollutants and other materials are carried through the atmosphere and deposited in soil and water through dry deposition; in wet deposition, these are mixed with suspended water in the atmosphere and washed out through rain, snow or fog.

    "Several studies have attempted to quantify the global plastic cycle but were unaware of the atmospheric limb," Brahney said. "Our data show the plastic cycle is reminiscent of the global water cycle, having atmospheric, oceanic, and terrestrial lifetimes."

    The study examined the source and life history of both wet (rain) and dry microplastic deposition. Cities and population centers were found to serve as the initial source of plastics associated with wet deposition, but secondary sources included the redistribution of microplastics re-entrained from soils or surface waters. In contrast, dry deposition of plastics showed indicators of long-range transport and was associated with large-scale atmospheric patterns. This suggests that microplastics are small enough to be entrained in the atmosphere for cross-continental transport.

    The plastics deposited in both wet and dry samples mainly consisted of microfibers sourced from both clothing and industrial materials. Approximately 30 percent of the particles were brightly colored acrylic microbeads, likely derived from industrial paints and coatings.

    As clear and white particles were not included — they did not meet the researchers' criteria for visual counting under magnification — the calculated deposition rates are likely to be an underestimate.

    Other particles were fragments of larger pieces of plastic. The report notes that "this result, combined with the size distribution of identified plastics, and the relationship to global-scale climate patterns, suggest that plastic emission sources have extended well beyond our population centers and, through their longevity, spiral through the Earth system."

    "This ubiquity of microplastics in the atmosphere and the subsequent deposition to remote terrestrial and aquatic environments raise widespread ecological and societal concerns," Brahney said. "Identifying the key mechanisms of plastic emission to the atmosphere is a first step in developing global-scale solutions."

    The findings are reported in the June 12 issue of Science Magazine in the article, Plastic Rain in Protected Areas of the United States.

    In a statement in response to the study, the American Chemistry Council said scientific research does not suggest that human health is harmed at current levels of exposure to microplastics, and it advocated a “risk-based” framework.

    “ACC and its partners around the world are committed to helping people better understand what we know, based on science, about microplastics and their potential effects on human health and the environment,” the Washington-based group said. 

    “The current scientific literature does not suggest human health is affected from microplastics at current, very low levels of exposure, and in fact, a the World Health Organization recently concluded that there is no evidence to indicate a human health concern from drinking water,” ACC said.

    It pointed to efforts to reduce plastic waste in the environment, such as the Alliance to End Plastic Waste and the ACC’s goal of having all plastic packaging by reused, recycled or recovered by 2040, and that all of it be recyclable or recoverable by 2030.

    Brahney, Janice, Margaret Hallerud, Eric Heim, Maura Hahnenberger, Suja Sukumaran. "Plastic Rain in Protected Areas of the United States," Science, 12 June 2020 DOI: 10.1126/science.aaz5819

    RECOMMENDED FOR YOU
    Tennessee-based insulation maker adding equipment, jobs
    Letter
    to the
    Editor

    Do you have an opinion about this story? Do you have some thoughts you'd like to share with our readers? Plastics News would love to hear from you. Email your letter to Editor at [email protected]

    Most Popular
    1
    An 8,000-ton dream for Milacron, 20/20 Custom Molded Plastics
    2
    US Merchants opens curtain on growing injection molding operations
    3
    Report: Tekni-Plex may be for sale
    4
    Rising costs prompt delay in Corpus Christi PET plant construction
    5
    Plastics processors face automation needs, sustainability demands
    SIGN UP FOR OUR FREE NEWSLETTERS
    EMAIL ADDRESS

    Please enter a valid email address.

    Please enter your email address.

    Please verify captcha.

    Please select at least one newsletter to subscribe.

    Find more newsletters at plasticsnews.com/newsletters.

    You can unsubscribe at any time through links in these emails. For more information, see our Privacy Policy.

    Get our newsletters

    Staying current is easy with Plastics News delivered straight to your inbox, free of charge.

    Subscribe today

    Subscribe to Plastics News

    Subscribe now
    Connect with Us
    • LinkedIn
    • Facebook
    • Twitter
    • Instagram

    Plastics News covers the business of the global plastics industry. We report news, gather data and deliver timely information that provides our readers with a competitive advantage.

    Contact Us

    1155 Gratiot Avenue
    Detroit MI 48207-2997

    Customer Service:
    877-320-1723

    Resources
    • About
    • Staff
    • Editorial Calendar
    • Media Kit
    • Data Store
    • Digital Edition
    • Custom Content
    • People
    • Contact
    • Careers
    • Sitemap
    Related Crain Publications
    • Sustainable Plastics
    • Rubber News
    • Tire Business
    • Urethanes Technology
    Legal
    • Terms and Conditions
    • Privacy Policy
    • Privacy Request
    Copyright © 1996-2023. Crain Communications, Inc. All Rights Reserved.
    • News
      • Processor News
        • Injection Molding
        • Blow Molding
        • Film & Sheet
        • Pipe/Profile/Tubing
        • Rotomolding
        • Thermoforming
        • Recycling
      • Suppliers
        • Machinery
        • Materials
        • Molds/Tooling
        • Product news
        • Design
      • More News
        • K Show
        • Mergers & Acquisitions
        • Sustainability
        • Public Policy
        • Material Insights Videos
        • Numbers that Matter
      • Digital Edition
      • End Markets
        • Automotive
        • Packaging
        • Medical
        • Consumer Products
        • Construction
      • Special Reports
        • Notable Leaders in Sustainability
        • Processor of the Year
        • Best Places to Work
        • Women Breaking the Mold
        • Rising Stars
        • Diversity
        • Most Interesting Social Media Accounts in Plastics
      • Newsletters
      • Videos
      • Podcasts
    • Opinion
      • The Plastics Blog
      • Kickstart
      • One Good Resin
      • Pellets and Politics
      • All Things Data
      • Viewpoint
      • From Pillar to Post
      • Perspective
      • Mailbag
      • Fake Plastic Trees
    • Shop Floor
      • Blending
      • Compounding
      • Drying
      • Injection Molding
      • Purging
      • Robotics
      • Size Reduction
      • Structural Foam
      • Tooling
      • Training
    • Events
      • Plastics News Events
        • Plastics News Executive Forum
        • Injection Molding & Design Expo
        • Plastics Caps + Closures: A Global Online Event
        • Women Breaking the Mold Networking Forum
      • Industry Events
      • Injection Molding & Design Expo
      • Livestreams/Webinars
      • Editorial Livestreams
        • Bioplastics Live
        • Numbers that Matter Live
        • PFAS Live
        • Plastics in Politics Live
        • PN Live: Mergers and Acquisitions
        • Polymer Points Live
        • Sustainable Plastics Live
      • Ask the Expert
      • Plastics News Events Library
        • Plastics Caps & Closures Library
        • Plastics in Healthcare Library
        • Women Breaking the Mold Networking Forum Library
    • Rankings & Data
      • Injection Molders
      • Blow Molders
      • Film Sheet
      • Thermoformers
      • Pipe Profile Tubing
      • Rotomolders
      • Mold/Toolmakers
      • LSR Processors
      • Recyclers
      • Compounders - List
      • Association - List
      • Plastic Lumber - List
      • All
    • Directory
    • Resin Prices
      • Resin Prices Overview
      • Commodity Thermoplastics
      • High Temperature Thermoplastics
      • Engineering Thermoplastics
      • Recycled Plastics
      • Thermosets
      • Europe - Virgin
      • Europe - Recycled
      • Europe - Feedstock
    • Custom
      • Sponsored Content
      • LS Mtron Sponsored Content
      • Conair Sponsored Content
      • KraussMaffei Sponsored Content
      • ENGEL Sponsored Content
      • White Papers
      • Classifieds
        • Place an Ad
        • Sign up for Early Classified