In February, a train was partially derailed while carrying a number of chemicals. The subsequent attempt at containment resulted in the release of many thousands of gallons of these chemicals. What were those chemicals? What are the risks involved in their release?
References:

https://www.nytimes.com/article/ohio-train-derailment.html
https://www.ntsb.gov/news/press-releases/Pages/NR20230214.aspx
https://www.tandfonline.com/doi/abs/10.1080/0002889718506429
https://www.sciencedirect.com/science/article/pii/S0160412007001390
https://www.sciencedirect.com/science/article/pii/S0304389421030533
https://pubs.acs.org/doi/full/10.1021/es1013664#https://www.mdpi.com/1422-0067/20/3/617
https://www.sciencedirect.com/science/article/pii/S0013935105001921
https://news.wosu.org/2023-03-01/could-dioxins-be-in-the-soil-after-the-east-palestine-train-derailment-experts-weigh-in