Methane

Aerodynamics mobile laboratory
Drexel University

EDITOR'S NOTE: The original version of this story incorrectly said Bentley Systems was a funder of the research. Also, the research shows carbon monoxide levels dropped. The original story said carbon dioxide.

The percentage of methane in the air of a Marcellus Shale area of northern Pennsylvania was reported in the Drexel University analysis to be higher than it was before the oil and gas drilling boom came there.