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Black and Hispanic Americans are exposed to higher amounts of air pollution that non-Hispanic white Americans generate, according to new research.

Poor air quality is the largest environmental health risk in the United States. Fine particulate matter pollution is responsible for more than 100,000 deaths each year from heart attacks, strokes, lung cancer, and other diseases.

But not everyone is equally exposed to poor air quality—nor are all people equally responsible for generating it.

The new finding, which quantifies for the first time the racial gap between who generates air pollution and who breathes it, appears in the Proceedings of the National Academy of Sciences.

“Similar to previous studies, we show that racial-ethnic minorities are exposed to more pollution on average than non-Hispanic whites,” says first author Christopher Tessum, a research scientist in the University of Washington’s civil and environmental engineering department and a recent University of Minnesota graduate.

On average, non-Hispanic white Americans spend more money on pollution-intensive goods and services, which means they generate more pollution than other groups

“What is new is that we find that those differences do not occur because minorities on average cause more pollution than whites—in fact, the opposite is true.”

The team compared what people spend their money on—like buying groceries or gas or getting clothes dry-cleaned—to the pollution these activities generate. Then the researchers overlaid these results on a map of where people live to see if there was the difference between the pollution that specific racial-ethnic groups generate and what they experience.

“Someone had to make the pen you bought at the store,” says coauthor Julian Marshall, a professor of civil and environmental engineering. “We wanted to look at where the pollution associated with making that pen is located. Is it close to where people live? And who lives there?”

The team found that on average, non-Hispanic white Americans spend more money on pollution-intensive goods and services, which means they generate more pollution than other groups. But white Americans also experience a “pollution advantage” in that they face exposure to approximately 17 percent less pollution than they generate.

On average, black Americans experience about 56 percent more pollution than they generate. For Hispanics, it is slightly higher: 63 percent.

At the same time, black and Hispanic populations bear a “pollution burden.” On average, black Americans experience about 56 percent more pollution than they generate. For Hispanics, it is slightly higher: 63 percent.

Longstanding societal trends, such as income inequality, may influence these disparities. Also, racial patterns in where people live often reflect segregation or other conditions from decades earlier. Black and Hispanic Americans are more likely to live in locations with higher concentrations of pollution compared to white Americans, which means they have increased average daily exposure to it.

In general, the US has made strides to reduce air pollution across the country: Average exposure to particulate pollution declined approximately 50 percent between 2003 and 2015. But pollution inequity remained high over that same period.

“Our work is at the intersection of many important and timely topics such as race, inequality, affluence, environmental justice, and environmental regulation,” says corresponding author Jason Hill, an associate professor of bioproducts and biosystems engineering at the University of Minnesota.

The team hopes this pollution-inequity metric can provide a simple and intuitive way for policymakers and the public to see the disparity between the pollution that population groups generate and their pollution exposure.

“The approach we establish in this study could be extended to other pollutants, locations, and groupings of people,” Marshall says. “When it comes to determining who causes air pollution—and who breathes that pollution—this research is just the beginning.”

Additional coauthors are from the University of Texas at Austin, the University of New Mexico, Carnegie Mellon University, Lumina Decision Systems, the University of Washington, and the University of Minnesota.

The US Environmental Protection Agency, the US Department of Energy, the US Department of Agriculture, and the University of Minnesota Institute on the Environment funded the study.

Source: University of Washington