In 2023, researchers tested a Vancouver rain garden against a tire-derived toxin; it kept more than 90% from passing through into drainage

A Vancouver bioretention cell showed a 95% reduction in 6PPD-quinone mass. Researchers found bioretention cells offer a 10-fold reduction in this tire chemical. Modeling predicted over 90% mitigation of loadings under typical storm conditions. This study provides evidence for bioretention's effectiveness in managing tire-derived chemicals.