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Behavior-Driven Emissions and Risk Prioritization of Tire Additives and Their Transformation Products in Driving Training Fields: Implications for Nonexhaust Traffic Pollution Management
Summary
Every time tires grip the road, they shed tiny particles loaded with chemical additives — and this study found that certain driving moves, especially sharp turns, release far more of these chemicals into road dust than driving straight. Researchers tested dust from driving schools and identified over 100 different tire chemicals, some never documented before, then flagged 22 of them as high-priority pollutants based on how toxic, persistent, and likely to build up in the body they are. This matters because these particles settle into the dust around roads and parking lots where people (and kids) are regularly exposed, suggesting that how we drive — not just how much — could be a meaningful
With the increasing release of tire wear particles, environmental exposure to tire additives and their transformation products (TATPs) has grown substantially; however, their risks remain poorly characterized and potentially underestimated. Dust samples from six driving training modules across 20 driving schools in Qingdao, China, were analyzed to investigate TATPs and their behavioral drivers. A total of 124 TATPs (median: 1.31 × 10 4 ng/g) were detected, including 12 newly reported compounds. Antioxidants (median: 7.03 × 10 3 ng/g) dominated, followed by plasticizers (median: 4.14 × 10 3 ng/g) and vulcanization accelerators (median: 1.27 × 10 3 ng/g). TATP concentrations varied significantly across training modules, with quarter turning modules showing the highest levels (median: 3.47 × 10 4 ng/g) and straight driving modules the lowest (median: 4.69 × 10 3 ng/g). Random forest and nonlinear models identified training module type as the key driver, with TATP enrichment increasing with driving intensity. These modules serve as proxies for urban traffic behavior, capturing fundamental tire–road interaction regimes. Integrating persistence, bioaccumulation, toxicity, and exposure, two high-priority and 20 medium-priority pollutants were identified. Overall, these results underscore the critical role of driving behavior in regulating TATP emissions and provide a basis for prioritizing high-risk pollutants in nonexhaust traffic pollution management.