WASHINGTON (AP) — The Environmental Protection Agency says it will conduct helicopter overflights to look for methane “super emitters” in the nation’s largest oil and gas producing region.

EPA’s Region 6 headquarters in Dallas, Texas, issued a news release about a new enforcement effort in the Permian Basin on Monday, saying the flights would occur over the next two weeks.

The announcement came four days after The Associated Press published an investigation that showed 533 oil and gas facilities in the region are emitting excessive amounts of methane and named the companies most responsible.

Colorless and odorless, methane is a potent greenhouse gas that traps 83 times more heat in the atmosphere over a 20 year period than an equivalent amount of carbon dioxide.

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