Scientists affiliated with the National Oceanic and Atmospheric Administration (NOAA) have determined that oil and gas operations on Colorado's front range are pumping almost three times more methane and seven times more benzene into the air than previously estimated.
Researchers collected air samples from an airplane over Weld County over two days in May 2012. Previous studies measured air samples taken at ground-level or from a 985-foot tall tower. This is the first study to measure airborne contaminants from an airplane.
Researchers found that 24,000 active oil and gas wells active in Weld County in May 2012 were emitting a total of 19.3 tons of methane each hour, or about triple the amount the U.S. Environmental Protection Agency estimated would come from industry-reported emissions.
Drilling operations emitted benzene at a rate of 380 pounds each hour, or about seven times more than the 50 pounds an hour the Colorado Department of Public Health and Environment estimated based on industry-reported data.