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Co-Designing a School-Based Citizen Science Protocol to Investigate Tire-Related Pollutants in Barcelona
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Barcelona students helped scientists design a way to measure pollution from tire wear, tiny rubber particles and chemicals that flake off tires and float into the air we breathe. Working directly with teens made the study more practical and revealed how little people know about this hidden pollution source. This approach could help identify tire-related chemical exposure risks in schools and neighborhoods with heavy traffic.
Adolescents are both key beneficiaries and underrepresented partners in urban exposure research. We co-designed the CIRCULATE study with students from two secondary schools in the Metropolitan Area of Barcelona to collaboratively develop research questions and a feasible school-based protocol for investigating non-exhaust traffic emissions, specifically tire-related pollutants. Applying an Urban Health Laboratory methodology, the process unfolded in three stages: (i) participatory diagnosis to identify students' environmental concerns and build a shared understanding of tire-related pollution, (ii) citizen science co-definition and prioritization of research questions within the predefined thematic framework of tire-related chemicals (TRCs), and (iii) collaborative design of a school-compatible study protocol (variables, tools, where and when to sample). Across the two schools, traffic-related pollution consistently emerged as the dominant concern; tires were widely recognized as a pollution source, yet knowledge about tire-wear particles and associated additives was limited. Students produced idea summaries that were iteratively refined into draft research questions and categorized for analysis, prioritizing exposure pathways close to where they live and study. The co-design process proved feasible and context-appropriate for schools, integrating low-cost personal monitoring (passive/low-burden/voluntary silicone wristbands, portable sensors) and biological monitoring (urine samples) with school-level observation and structured discussions to guide near-term interventions. The co-creation process increased literacy, ownership, and motivation to act, and yielded a protocol that may be adapted and tested in future deployments across neighborhoods with varying traffic loads and urban morphologies. Overall, including adolescent perspectives strengthens the relevance and practicality of urban exposure research, surfaces blind spots on tire wear, and mobilizes school-level actions while laying groundwork for larger, comparative deployments.
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Researchers modeled airborne concentrations of tire wear particles — tiny plastic-containing fragments released when vehicle tires rub against road surfaces — across Stockholm, finding that these microplastic particles are widespread in cities and make up 4–6% of total air particle pollution, with concentrations highest near busy highways and in narrow street canyons.
Chemical tracers for assessing the contribution of tire wear particles in atmospheric aerosol: analytical approaches, challenges and future perspectives
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Every time your car's tires grip the road, they shed tiny plastic particles that become part of the air pollution you breathe, and this can account for more air pollution than what comes out of your tailpipe. This review paper looks at the scientific methods used to detect these tire particles in air pollution and finds that there's currently no reliable single test for them, meaning scientists still need better tools to figure out exactly how much of the air we breathe contains this tire-derived microplastic pollution and its associated chemicals. This matters because until we can accurately measure it, it's hard to fully assess the health risks these particles and their leaching chemicals may pose.
Tire Wear Particles' Environmental Distribution and Potential Threats to Human Health
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Researchers reviewed the environmental distribution and health hazard profile of tire wear particles, highlighting that their complex rubber-carbon black-additive matrix—particularly the chemical 6PPD-quinone, which is acutely lethal to coho salmon below 1 µg/L—distinguishes them toxicologically from conventional microplastics and demands specialized monitoring and risk assessment frameworks.
Comparison of traffic-related micro- and nanoplastic concentrations at three urban locations
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Researchers measured airborne tire and road wear particles (microplastics shed from vehicle tires) at a busy urban road, a highway, and a park, finding rubber particle concentrations were 2-5 times higher near traffic compared to the park, with levels closely tracking other traffic pollutants like black carbon.
Assessment of tire wear emission in a road tunnel, using benzothiazoles as tracer in tunnel wash water
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Researchers developed a methodology to quantify tire wear emissions in a road tunnel using benzothiazoles — chemical components of tire rubber — as tracers in tunnel wash water. The approach offers a practical way to estimate how much tire particle pollution, a major source of microplastics, is generated on busy road corridors.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.