For the first time, natural gas production linked to lower birth weights in a national study

The impacts were most significant among Black and Asian women

Across the U.S., birth weights have declined as rates of natural gas production have increased, according to a new, first-of-its-kind national study.


While previous studies linked increases in fracking and natural gas production to lower birth weights in high-producing states like Texas and Pennsylvania, this is the first to examine associations across states where extraction occurs.

“Those single-state studies are important, but you have to consider whether that information is generalizable to other parts of the country,” Summer Sherburne Hawkins, an associate professor at the Boston College School of Social Work and senior author of the study, told EHN. “With our study, we’re able to say that this is not unique to a specific state, but is true across the country.”

The study, published in the journal Preventive Medicine Reports, found that every 10% increase in natural gas development in U.S. counties is associated with a corresponding decrease in average birth weight of 1.48 grams, or 0.003 pounds. Among women of color, the impact was more significant: With every 10% increase in natural gas production, Asian babies’ average birth weight decreased by 2.76 grams, or 0.006 pounds; and Black babies’ average birth weight decreased by 10.19 grams, or 0.02 pounds.

“That might not seem like a lot, but in some parts of the U.S. rates of natural gas production are increasing by thousands of percentage points over a very short period of time,” Hawkins said. “Lots of states are considering increasing production and this research allows us to predict the potential implications for public health.”

Low birth weight is associated with higher rates of infant mortality, poor lung development, problems with growth and cognitive development, and increased risk of health problems later in life, including diabetes, heart disease, high blood pressure and developmental disabilities.

The study didn’t look at how natural gas production could cause lower birth weight, but previous research shows harmful chemicals emitted from wells increase levels of air pollution in nearby communities. Exposure to air pollution has also been linked to low birth weight. Water contamination caused by spills on and near well pads could also be a contributing factor.

Environmental justice concerns

To conduct the research, Hawkins and her colleagues looked at more than 33.8 million birth records from 2005 to 2018 from 1,984 counties in the 28 states where natural gas production occurred. They compared birth weights during that period with nine-month county-level averages of natural gas production at both conventional and fracking wells.

Jill Johnston, an associate professor at the University of Southern California Los Angeles who has researched the health impacts of fracking but was not involved in this study, said the findings are significant.

“There have been very few national scale studies that look at these kinds of health impacts,” Johnston told EHN. “It’s a real strength to be able to look more broadly across the U.S. and see that these impacts are happening in many different communities, even if they haven’t been the focus of prior research like places with more intensive shale development.”

Johnston noted that previous investigations on racial disparities in the health impacts of oil and gas development have been limited.

Related: See where toxic PFAS have been used in Pennsylvania fracking wells

“I think this adds to the evidence that the adverse health impacts associated with these kinds of activities should be taken into account, particularly when permitting new wells in environmental justice communities,” she said. “We should be thinking about the cumulative burden and considering more health protective policies for these vulnerable populations.”

While the study didn’t examine why women of color could be more susceptible to birth weight impacts from natural gas development, previous research suggests that women of color are more likely to experience other environmental and social factors that negatively impact birth outcomes.

“We know communities of color and low-income communities bear a disproportionate burden of environmental hazards,” Hawkins said. “Our study indicates that adding new oil and gas development to communities that already face environmental injustice may be compounding these effects — not just for the current population, but also for the next generation.”

Op-ed: Ripe for disaster declarations — heat, wildfire smoke and death data

Currently, the federal data on extreme heat and wildfire smoke itself constitutes a major disaster.

Extreme heat and wildfire smoke should of course be defined as major disasters by the Federal Emergency Management Agency. According to the National Weather Service, heat kills more people in this nation than hurricanes, tornadoes, floods, and lightning combined.
Keep reading...Show less
Senator Whitehouse & climate change

Senator Whitehouse puts climate change on budget committee’s agenda

For more than a decade, Senator Sheldon Whitehouse gave daily warnings about the mounting threat of climate change. Now he has a powerful new perch.
Amid LNG’s Gulf Coast expansion, community hopes to stand in its way
Coast Guard inspects Cameron LNG Facility in preparation for first LNG export in 2019. (Credit: Coast Guard News)

Amid LNG’s Gulf Coast expansion, community hopes to stand in its way

This 2-part series was co-produced by Environmental Health News and the journalism non-profit Economic Hardship Reporting Project. See part 1 here.Este ensayo también está disponible en español
Keep reading...Show less

Wildfire smoke impacts air quality in parts of Canada and western US

Smoke from wildfires across several western US states and Canada has led to air quality alerts in affected regions.

Dorany Pineda reports for The Associated Press.

Keep reading...Show less
uk climate tree species
Credit: RdA Suisse/Flickr

London's Royal Botanical Gardens faces major tree loss due to climate change

Kew Gardens could lose over half of its tree species by 2090 due to climate change, a new study warns.

Helena Horton reports for The Guardian.

Keep reading...Show less

Supreme Court considers halting Biden's EPA climate rule

The Supreme Court may undermine the U.S. Environmental Protection Agency's latest rule on emissions from power plants, following challenges from conservative states and industry groups.

Niina H. Farah reports for E&E News.

Keep reading...Show less
Kamala Harris Environmental Justice
Credit: NASA HQ PHOTO/Flickr

Harris could expand environmental justice efforts as president

Vice President Kamala Harris aims to amplify environmental justice initiatives if she becomes president, building on the Biden administration's legacy of supporting marginalized communities impacted by pollution.

Kevin Bogardus reports for E&E News.

Keep reading...Show less

Millions of Californians face wildfire risks near oil wells

Millions of Californians live near oil and gas wells that are increasingly in the path of wildfires, raising concerns about explosions, pollution and infrastructure damage.

Hayley Smith reports for Los Angeles Times.

Keep reading...Show less
From our Newsroom
pennsylvania fracking

Living near oil and gas operations linked to worse mental health in people hoping to become pregnant

“If we’re concerned about healthy pregnancies, focusing on the period before pregnancy may be even more important.”

climate change flooding

Op-ed: The climate crisis demands a move away from car dependency

Power shutoffs or wildfire evacuations can be deadly for disabled people, especially nondrivers who may not have a way to get to a cooling center or evacuation point.

joe biden

Biden administration unveils plan to wean US government off single-use plastics

“Because of its purchasing power … the Federal Government has the potential to significantly impact the supply of these products.”

chemical recycling

Chemical recycling has an economic and environmental injustice problem: Report

“It wouldn’t even make a dent in the amount of plastic pollution out there.”

carbon capture

30 environmental advocacy groups ask PA governor to veto carbon capture bill

“Putting resources toward carbon capture and storage instead of renewable energy is wasting time we don’t have.”

Stay informed: sign up for The Daily Climate newsletter
Top news on climate impacts, solutions, politics, drivers. Delivered to your inbox week days.