Sorry, Emmanuel, but many people, with good cause, don't believe what the EPA says.  The EPA kind of reminds me of the stickers that warn of cancer causing "in the state of California".  

Everything is dangerous in enough quantity.  The real, scientific question is what is the real danger of these "leaks, flares and other plant operations".  Let's see some scientific evidence or pragmatic proof that "leak sniffing" needs to be done each month, and not every two months, or that the levels released justify the expense. 

Based on experience with the them, I wouldn't put any weight at all on the EPA's opinion.   The truth is the EPA runs off bureaucratic protocol.  My interaction with them has not been in enforcement, either; I have no ax to grind with them specifically.   It is just that this is most likely a waste of money that, in the end, comes out of our pocket as consumers, and serves no benefit to anyone except some bureaucrats in the EPA.