CAMBRIDGE, Massachusetts, February 13, 2020 (ENS) – More than half of all early deaths in the United States due to poor air quality are a result of emissions originating outside of the state in which those deaths occur, report researchers with the Massachusetts Institute of Technology, MIT.
Published in the current issue of the journal “Nature,” the study tracks combustion emissions of polluting compounds from various sectors, looking at each state in the lower 48, from season to season and year to year between 2005 and 2018.
The researchers found that when air pollution is generated in one state, half of that pollution is carried by winds across state boundaries, to affect the health 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 indicate. 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.
Still, there was a decline in these early deaths associated with air pollution during the study period. The researchers found that these early deaths decreased 30 percent in 2018 compared to 2005, equivalent to about 30,000 avoided early deaths.
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.
This reduction in cross-state pollution appears to be related to reduction in emissions from electric power generation. During the study period, regulations such as the U.S. Environmental Protection Agency’s Clean Air Act and other changes have helped to curb emissions from this sector across the country.
But the researchers caution that now 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 said.
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.
Scientists have long known that air pollution observes no boundaries; acid rain is one of the prime examples.
“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 said.
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 these tools, drawing on fundemental work by Daven Henze at the University of Colorado at Boulder, to track how every state in the lower 48 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.
The MIT scientists 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 with the 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 said. “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.”
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.”
Electric power generation has the greatest range, as power plants can send pollutants high into the atmosphere, allowing them to travel long distances. In contrast, commercial and residential sectors generally emit pollutants that do not last as long in the atmosphere.
“The story is different for each pollutant,” Barrett says.
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.
The states that “import” health impacts tend to lie along the East Coast, in the path of the winds that sweep eastward across the continent.
New York state is what the researchers call “the biggest importer of air pollution deaths.” Sixty 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 said. “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.