U.S. oil field linked to global uptick in air pollution

WASHINGTON — An oil and natural gas field in the western United States is largely responsible for a global uptick of the air pollutant ethane, according to a new study.

The team led by researchers at the University of Michigan found that fossil fuel production at the Bakken Formation in North Dakota and Montana is emitting roughly 2 percent of the ethane detected in the Earth’s atmosphere.

Along with its chemical cousin methane, ethane is a hydrocarbon that is a significant component of natural gas. Once in the atmosphere, ethane reacts with sunlight to form ozone, which can trigger asthma attacks and other respiratory problems, especially in children and the elderly. Ethane pollution can also harm agricultural crops. Ozone also ranks as the third-largest contributor to human-caused global warming after carbon dioxide and methane.

“We didn’t expect one region to have such a global influence,” said Eric Kort, lead author of the study and an assistant professor of climatic science at the University of Michigan in Ann Arbor.

The study was launched after a mountaintop sensor in the European Alps began registering surprising spikes in ethane concentrations in the atmosphere starting in 2010, following decades of declines. The increase, which has continued over the last five years, was noted at the same time new horizontal drilling and hydraulic fracturing techniques were fueling a boom of oil and gas production from previously inaccessible shale rock formations in the United States.

Searching for the source of the ethane, an aircraft from the National Oceanic and Atmospheric Administration in 2014 sampled air from directly overhead and downwind of drilling rigs in the Bakken region. Those measurements showed ethane emissions far higher than what was being reported to the government by oil and gas companies.

The findings solve an atmospheric mystery — where that extra ethane was coming from, said Colm Sweeney, a study co-author from the Cooperative Institute for Research in Environmental Sciences at the University of Colorado in Boulder.

The researchers said other U.S. oil and gas fields, especially the Eagle Ford in Texas, are also likely contributing to the global rise in ethane concentrations. Ethane gets into the air through leaks from drilling rigs, gas storage facilities and pipelines, as well as from intentional venting and gas burnoffs from extraction operations.

“We need to take these regions into account because it could really be impacting air quality in a way that might matter across North America,” Kort said.

Helping drive the high emission levels from the Bakken has been the oil field’s meteoric growth. Efforts to install and maintain equipment to capture ethane and other volatile gases before they can escape have lagged behind drilling, said North Dakota Environmental Health Chief Dave Glatt.

Glatt’s agency has stepped up enforcement efforts in response. Last year, the state purchased a specialized camera that can detect so-called fugitive gas emissions as they escape from uncontained oil storage tanks, leaky pipelines, processing facilities and other sources.

“You’re able to see what the naked eye can’t and it reveals emissions sources you didn’t know where there,” Glatt said. “It’s a game changer. A lot of the companies thought they were in good shape, and they looked through the camera and saw they weren’t.”

Regulators at the Environmental Protection Agency were reviewing the study’s results. Spokeswoman Laura Allen said Friday that new clean air rules recently announced by the Obama administration to curb climate-warming methane leaks from oil and gas drilling operations should also help address the harmful ethane emissions.

There are other ways ethane gets into the atmosphere — including wildfires and natural seepage from underground gas reserves. But fossil fuel extraction is the dominant source, accounting for roughly 60 to 70 percent of global emissions, according to a 2013 study from researchers at the University of California.

Talk to us

> Give us your news tips.

> Send us a letter to the editor.

> More Herald contact information.

More in Local News

A firefighter stands in silence before a panel bearing the names of L. John Regelbrugge and Kris Regelbrugge during the ten-year remembrance of the Oso landslide on Friday, March 22, 2024, at the Oso Landslide Memorial in Oso, Washington. (Ryan Berry / The Herald)
‘Flood of emotions’ as Oso Landslide Memorial opens on 10th anniversary

Friends, family and first responders held a moment of silence at 10:37 a.m. at the new 2-acre memorial off Highway 530.

Julie Petersen poses for a photo with images of her sister Christina Jefferds and Jefferds’ grand daughter Sanoah Violet Huestis next to a memorial for Sanoah at her home on March 20, 2024 in Arlington, Washington. Peterson wears her sister’s favorite color and one of her bangles. (Annie Barker / The Herald)
‘It just all came down’: An oral history of the Oso mudslide

Ten years later, The Daily Herald spoke with dozens of people — first responders, family, survivors — touched by the deadliest slide in U.S. history.

Victims of the Oso mudslide on March 22, 2014. (Courtesy photos)
Remembering the 43 lives lost in the Oso mudslide

The slide wiped out a neighborhood along Highway 530 in 2014. “Even though you feel like you’re alone in your grief, you’re really not.”

Director Lucia Schmit, right, and Deputy Director Dara Salmon inside the Snohomish County Department of Emergency Management on Friday, March 8, 2024, in Everett, Washington. (Ryan Berry / The Herald)
How Oso slide changed local emergency response ‘on virtually every level’

“In a decade, we have just really, really advanced,” through hard-earned lessons applied to the pandemic, floods and opioids.

Ron and Gail Thompson at their home on Monday, March 4, 2024 in Oso, Washington. (Olivia Vanni / The Herald)
In shadow of scarred Oso hillside, mudslide’s wounds still feel fresh

Locals reflected on living with grief and finding meaning in the wake of a catastrophe “nothing like you can ever imagine” in 2014.

Everett mall renderings from Brixton Capital. (Photo provided by the City of Everett)
Topgolf at the Everett Mall? Mayor’s hint still unconfirmed

After Cassie Franklin’s annual address, rumors circled about what “top” entertainment tenant could be landing at Everett Mall.

Everett
Everett man sentenced to 3 years of probation for mutilating animals

In 2022, neighbors reported Blayne Perez, 35, was shooting and torturing wildlife in north Everett.

Dorothy Crossman rides up on her bike to turn in her ballot  on Tuesday, Aug. 1, 2023 in Everett, Washington. (Olivia Vanni / The Herald)
Everett leaders plan to ask voters for property tax increase

City officials will spend weeks hammering out details of a ballot measure, as Everett faces a $12.6 million deficit.

Starbucks employee Zach Gabelein outside of the Mill Creek location where he works on Friday, Feb. 23, 2024 in Mill Creek, Washington. (Olivia Vanni / The Herald)
Mill Creek Starbucks votes 21-1 to form union

“We obviously are kind of on the high of that win,” store bargaining delegate Zach Gabelein said.

Lynnwood police respond to a collision on highway 99 at 176 street SW. (Photo provided by Lynnwood Police)
Police: Teen in stolen car flees cops, causes crash in Lynnwood

The crash blocked traffic for over an hour at 176th Street SW. The boy, 16, was arrested on felony warrants.

The view of Mountain Loop Mine out the window of a second floor classroom at Fairmount Elementary on Wednesday, Jan. 10, 2024 in Everett, Washington. (Olivia Vanni / The Herald)
County: Everett mining yard violated order to halt work next to school

At least 10 reports accused OMA Construction of violating a stop-work order next to Fairmount Elementary. A judge will hear the case.

Imagine Children's Museum's incoming CEO, Elizabeth "Elee" Wood. (Photo provided by Imagine Children's Museum)
Imagine Children’s Museum in Everett to welcome new CEO

Nancy Johnson, who has led Imagine Children’s Museum in Everett for 25 years, will retire in June.

Support local journalism

If you value local news, make a gift now to support the trusted journalism you get in The Daily Herald. Donations processed in this system are not tax deductible.