Skip to content ↓

Half of U.S. deaths related to air pollution are linked to out-of-state emissions

Study tracks pollution from state to state in the 48 contiguous United States.
Listen
Press Inquiries

Press Contact:

Abby Abazorius
Phone: 617-253-2709
MIT News Office

Media Download

New MIT study finds more than half of all air-quality-related early deaths in the United States are a result of cross-state pollution, or emissions originating outside of the state in which those deaths occur.
Download Image
Caption: New MIT study finds more than half of all air-quality-related early deaths in the United States are a result of cross-state pollution, or emissions originating outside of the state in which those deaths occur.
Credits: Image: Chelsea Turner, MIT

*Terms of Use:

Images for download on the MIT News office website are made available to non-commercial entities, press and the general public under a Creative Commons Attribution Non-Commercial No Derivatives license. You may not alter the images provided, other than to crop them to size. A credit line must be used when reproducing images; if one is not provided below, credit the images to "MIT."

Close
New MIT study finds more than half of all air-quality-related early deaths in the United States are a result of cross-state pollution, or emissions originating outside of the state in which those deaths occur.
Caption:
New MIT study finds more than half of all air-quality-related early deaths in the United States are a result of cross-state pollution, or emissions originating outside of the state in which those deaths occur.
Credits:
Image: Chelsea Turner, MIT

More than half of all air-quality-related early deaths in the United States are a result of emissions originating outside of the state in which those deaths occur, MIT researchers report today in the journal Nature.

The study focuses on the years between 2005 and 2018 and tracks combustion emissions of various polluting compounds from various sectors, looking at every state in the contiguous United States, from season to season and year to year.

In general, the researchers find that when air pollution is generated in one state, half of that pollution is lofted into the air and carried by winds across state boundaries, to affect the health quality of out-of-state residents and increase their risk of early death.

Electric power generation is the greatest contributor to out-of-state pollution-related deaths, the findings suggest. In 2005, for example, deaths caused by sulfur dioxide emitted by power plant smokestacks occurred in another state in more than 75 percent of cases.

Encouragingly, the researchers found that since 2005, early deaths associated with air pollution have gone down significantly. They documented a decrease of 30 percent in 2018 compared to 2005, equivalent to about 30,000 avoided early deaths, or people who did not die early as a result of pollution. In addition, the fraction of deaths that occur due to emissions in other states is falling — from 53 percent in 2005 to 41 percent in 2018.

Perhaps surprisingly, this reduction in cross-state pollution also appears to be related to electric power generation: In recent years, regulations such as the Environmental Protection Agency’s Clean Air Act and other changes have helped to significantly curb emissions from this sector across the country.

The researchers caution, however, that today, emissions from other sectors are increasingly contributing to harmful cross-state pollution.

“Regulators in the U.S. have done a pretty good job of hitting the most important thing first, which is power generation, by reducing sulfur dioxide emissions drastically, and there’s been a huge improvement, as we see in the results,” says study leader Steven Barrett, an associate professor of aeronautics and astronautics at MIT. “Now it’s looking like other emissions sectors are becoming important. To make further progress, we should start focusing on road transportation and commercial and residential emissions.”

Barrett’s coauthors on the paper are Sebastian Eastham, a research scientist at MIT; Irene Dedoussi, formerly an MIT graduate student and now an assistant professor at Delft University of Technology; and Erwan Monier, formerly an MIT research scientist and now an assistant professor at the University of California at Davis. The research was a collaboration between MIT’s Laboratory for Aviation and the Environment and the MIT Joint Program on the Science and Policy of Global Change.

Death and the matrix

Scientists have long known that pollution observes no boundaries, one of the prime examples being acid rain.

“It’s been known in Europe for over 30 years that power stations in England would create acid rain that would affect vegetation in Norway, but there’s not been a systematic way to capture how that translates to human health effects,” Barrett says.

In the case of the United States, tracking how pollution from one state affects another state has historically been tricky and computationally difficult, Barrett says. For each of the 48 contiguous states, researchers would have to track emissions to and from the rest of the 47 states.

“But now there are modern computational tools that enable you to do these assessments in a much more efficient way,” Barrett says. “That wasn’t really possible before.”

He and his colleagues developed such tools, drawing on fundemental work by Daven Henze at the University of Colorado at Boulder, to track how every state in the contiguous U.S. affects pollution and health outcomes in every other state. They looked at multiple species of pollutants, such as sulfur dioxide, ozone, and fine particulates, from various emissions sectors, including electric power generation, road transportation, marine, rail, and aviation, and commercial and residential sources, at intervals of every hour of the year.

They first obtained emissions data from each of seven sectors for the years 2005, 2011, and 2018. They then used the GEOS-Chem atmospheric chemistry transport model to track where these emissions ended up, from season to season and year to year, based on wind patterns and a pollutant’s chemical reactions to the atmosphere. Finally, they used an epidemiologically derived model to relate a population’s pollutant exposure and risk of early death.

“We have this multidimensional matrix that characterizes the impact of a state’s emissions of a given economic sector of a given pollutant at a given time, on any other state’s health outcomes,” Barrett says. “We can figure out, for example, how much NOx emissions from road transportation in Arizona in July affects human health in Texas, and we can do those calculations instantly.”

Importing pollution

The researchers also found that emissions traveling out of state could affect the health of residents beyond immediate, neighboring states.

“It’s not necessarily just the adjacent state, but states over 1,000 miles away that can be affected,” Barrett says. “Different kinds of emissions have a different kind of range.”

For example, electric power generation has the greatest range, as power plants can loft pollutants far into the atmosphere, allowing them to travel over long distances. In contrast, commercial and residential sectors generally emit pollutants that chemically do not last as long in the atmosphere.  

“The story is different for each pollutant,” Barrett says.

In general, the researchers found that out-of-state air pollution was associated with more than half of all pollution-related early deaths in the U.S. from 2005 to 2018.

In terms of the impact on individual states, the team found that many of the northern Midwest states such as Wyoming and North Dakota are “net exporters” of pollution-related health impacts, partly because the populations there are relatively low and the emissions these states generate are carried away by winds to other states. Those states that “import” health impacts tend to lie along the East Coast, in the path of the U.S. winds that sweep eastward.

New York in particular is what the researchers call “the biggest importer of air pollution deaths”; 60 percent of air pollution-related early deaths are from out-of-state emissions.

“There’s a big archive of data we’ve created from this project,” Barrett says. “We think there are a lot of things that policymakers can dig into, to chart a path to saving the most lives.”

This research was supported, in part, by the U.S. Environmental Protection Agency, the MIT Martin Family Fellowship for Sustainability, the George and Marie Vergottis Fellowship at MIT, and the VoLo Foundation.

Press Mentions

Bloomberg

Bloomberg reporter Leslie Kauffman spotlights a study by MIT researchers that shows roughly half of premature deaths caused by air pollution occur in states where the pollutants did not originate. “The numbers of deaths that are due to cross-state pollution are much bigger than anything we thought,” explains Prof. Steven Barrett.

The Conversation

Writing for The Conversation, Prof. Steven Barrett and research scientist Sebastian Eastham delve into their research exploring how pollution crosses state lines and causes death in other states across the U.S. “Our findings reflect the need not only for ongoing investigation of U.S. cross-state air pollution, but also for federal regulation that’s strong enough to significantly reduce it and help save Americans’ lives,” they write.

Scientific American

Scientific American reporter Jim Daley writes that MIT researchers have found half of the premature deaths linked to poor air quality are caused by out-of-state pollution. The researchers found “nearly 70 percent of deaths related specifically to electric power generation—the sector with the highest cross-border impact on premature mortality—occurred in states other than the one where the involved plant was located.”

CNN

Writing for CNN, Gisela Crespo spotlights how air pollution produced in one state can blow across state lines and contribute to premature deaths in other states. "This situation is a bit like secondhand smoke, but on a national scale," explains Prof. Steven Barrett.

Boston Globe

A study by MIT researchers examines how pollutants carried across state lines have contributed to premature deaths, reports Caroline Enos for The Boston Globe. “There’s a big archive of data we’ve created from this project,” says Prof. Steven Barrett. “We think there are a lot of things that policymakers can dig into, to chart a path to saving the most lives.”

Reuters

A study by MIT researchers provides evidence that half of premature deaths related to air pollution in U.S. states are caused by out-of-state pollution, reports Julie Steenhuysen for Reuters. The researchers found “electric power plants - which emit sulfur dioxide from smokestacks - were the biggest contributor to deaths related to pollution from other states.”

New York Times

MIT researchers have found that half of premature deaths caused by air pollution are linked to pollutants that originate out of state, reports Henry Fountain for The New York Times. “We know air quality is bad in many ways, and if we want to continue to improve it we need to understand what the causes are,” explains Prof. Steven Barrett.

Related Links

Related Topics

Related Articles

More MIT News