As the United States tries to meet its climate goals and address environmental justice issues, cutting greenhouse gases alone might not help communities of color dealing with air pollution.

In some cases, it might even hurt them, according to a new study from the University of California San Diego.

The study, published in the century-old scientific journal PNAS, reveals how, if the U.S. tries to cut greenhouse gases based on income or other factors instead of race, communities of color could suffer more from air pollution.

Air pollution and greenhouse gases have historically been separated into different categories, despite the fact that both are the end products of burning fossil fuels. But recent efforts, most notably by the Biden administration through the passage of the Inflation Reduction Act, have reclassified carbon dioxide as an air pollutant.

“The U.S. government says they see climate policy as an opportunity to advance equity,” said Pascal Polonik, lead author on the paper and a graduate student at the University of California San Diego. “So one of the questions to me then became, well, what happens if we reduce greenhouse gases? Are we also going to improve [air quality] equity?”

The study focused on a subset of particle pollution, called PM 2.5, that can be found at the end of tailpipes as well as in wildfire smoke. The type of pollution that researchers focused on is particularly harmful because of its small size. The 2.5 refers to particles that are less than 2.5 micrometers in diameter, tiny enough to bypass the body’s defenses and enter the bloodstream.

Meanwhile, the Biden administration introduced several key programs in the past few years to try to advance equity while fighting climate change. The most effective is an EPA initiative to cut power plant pollution by 2040. The move will give overburdened communities relief from excessive emissions.

One of the major programs of the administration is the Justice40 program, which directs 40 percent of federal funding to disadvantaged communities. But a screening tool for the program has been criticized by advocates for not explicitly including race, a key factor in determining where air pollution is the worst.

“Income is not a good proxy, alone, for race,” said Polonik.

Researchers modeled a variety of scenarios and found that cutting pollution based on the lowest cost scenario or randomly cutting pollution across the U.S. wouldn’t solve poor air quality in overburdened communities. In the scenario where the U.S. would use the cheapest option to slash emissions, air quality disparities would go up for Asian, Black, and Hispanic communities.

Read the full article about racism and air pollution by Siri Chilukuri at Grist.