You're right, it's with Environment. This was a decision that was taken in 1999, I think, to separate environmental issues from safety issues. Yes, we've all followed the Volkswagen diesel saga, a very sad saga, but it is not a safety-related issue; it is certainly a serious environmental issue, but that is now the responsibility of the Department of Environment and Climate Change.
On September 26th, 2017. See this statement in context.