Claim: " is among the worst in toxic air pollution in the entire United States ... and churns out more climate-changing greenhouse gases than oil giants Chevron, Shell and Valero."
Fact-check: Fact-check: Kochs worse polluters than oil giants?
Verdict: mostly-true
Organisation: PolitiFact
Author: Riley Snyder
Date published: 2016-07-19T00:00:00