"US playgrounds: fears grow over health risks from rubber particles" https://www.theguardian.com/us-news/2019/jun/25/lawmakers-concerned-chemicals-rubber-playg

"US playgrounds: fears grow over health risks from rubber particles" https://www.theguardian.com/us-news/2019/jun/25/lawmakers-concerned-chemicals-rubber-playgrounds-push-safety-rules https://www.theguardian.com/us-news/2019/jun/25/lawmakers-co... "Profiling and potential cancer risk assessment on children exposed to PAHs in playground dust/soil: a comparative study on poured rubber surfaced and classical soil playgrounds in Seoul " https://pubmed.ncbi.nlm.nih.gov/31134396/ https://pubmed.ncbi.nlm.nih.gov/31134396/ "substances of concern that were recently detected in recycled tire rubber samples.3 The nine chemicals are benzo(a)pyrene, hexavalent chromium, zinc, 4-methyl--pentanone, benzothiazole, lead, dibutyl phthalate, diethylhexyl phthalate, and 4-tert-octylphenol. UC staff identified acute, subchronic, and chronic TRVs, where available, for the oral, inhalation, and dermal routes" https://www.cpsc.gov/s3fs-public/Final-Report-on-Technical-Support-Activities-for-a-Screening-Level-Risk-Assessment-of-Playground-Surfaces.pdf?VersionId=MyHH6XdEqwCuuFUkSr4a4sPnfJMjGVT3 https://www.cpsc.gov/s3fs-public/Final-Report-on-Technical-S... There's a vast array of stuff on google if you search for playground cancer.