Coal rolling, a fad for trolling environmentalists, is against the law as far as the Environmental Protection Agency agency is concerned.
Anti-environmentalists have started rigging their trucks to expel more and darker exhaust than normal as a sort of counter-attack to environmentalists advocating lower emissions from vehicles. It's called "coal rolling."
TPM reached out to Liz Purchia, the press secretary for the EPA, about the changes. Purchia told TPM "the short answer is this is illegal."