A new study published this week shows that both race and class are significant indicators of how much toxic air pollution individuals face in the United States with minorities receiving nearly 40% more exposure to deadly airborne pollutants than whites.

The University of Minnesota study, according to lead researcher Julian Marshall, looked closely at the rates of pollution exposure by race, income, education and other key demographics to establish the key predictors of how specific populations are impacted across the country, state by state.

“The [main] ones are race and income, and they both matter,” Marshall said in an interview with MinnPost. “In our findings, however, race matters more than income.”

Specifically looking at levels of outdoor nitrogen dioxide (NO2), a byproduct found in vehicle exhaust and fossil fuel-fired power plants, the study—titled “”—found that people of color are exposed to 38 percent more of the deadly chemical which experts say can be a key driver of heart disease and other health problems.

According to the study:

Though it has been well-documented that low-income families and minorities have long been forced to live in undesirable neighborhoods near coal plants or high-traffic roadways, this study is being called “ground-breaking” for taking a national look at the issue and using advanced satellite technology to compare specific geographic areas with advanced pollution data.

As Emily Badger writes at the Washington Post:

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