Nitric acid
https://www.indystar.com/story/news/local/2021/06/03/indianapolis-traffic-interstate-70-indiana-nitric-acid-cause-orange-smoke-east-side-i-70-emerson-ave/7522965002/
Family spokesman Armando Gutierrez let in Associated Press photographer Alan Diaz through the front door so he could record the event.
https://www.pulitzer.org/winners/staff-48
AP & Pulitzer - the DS dream team of Fake News.