On Tuesday, Inhabitat published an article reporting that the MTA distributed a flyer thanking NYC train riders for participating in an NYPD study where perfluorocarbon gas would be pumped into the subway system. Yesterday, we learned that the flyer itself was not an official MTA communication, and was actually handed out by an unknown party. While the flyer was unauthorized, the gas tests, called the Subway-Surface Air Flow Exchange program, are real and trace amounts of perfluorocarbon gas will, in fact, be introduced into the subway system on certain dates in July.