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UNITED STATES (AP) - Across America, people of colour are exposed to more air pollution than whites from industry, vehicles, construction and many other sources, a new study has found.
Using government air pollution and census data, researchers found that disproportionate numbers of non-white people were exposed to potentially hazardous, fine particle pollution from nearly all major US emission sources, regardless of where they live or how much money they make.
The study, published last Wednesday in the journal Science Advances, also found that black people were the only group disproportionately exposed to each of the pollution sources examined.
Researchers found that on average black, Hispanic and Asian people were exposed to higher-than-average levels of fine particle pollution, while white people were subjected to lower-than-average levels.
"It doesn't matter how poor, it doesn't matter how wealthy, the racial disparities exist for all African Americans and other people of colour," said Paul Mohai, a professor of environmental justice at the University of Michigan who was not involved with the study.
He's researched racial disparities in the distribution of hazardous waste dumps, industrial facilities and air pollution at schools - and why and how these disparities exist.
"When you look at the impact of air pollution in the US from all the sources that contribute to fine particulate matter in the atmosphere, there is an overall systemic bias against people of colour," said study co-author Jason Hill, a biosystems engineering professor at the University of Minnesota.
Fine particulate matter comes from a variety of sources, including coal-fired power plants, diesel trucks and farms. Past research shows associations between exposure to particulate matter and health problems such as premature death in people with heart or lung disease, heart attacks, irregular heartbeat, and asthma.
While other studies have shown that non-white people are exposed to more air pollution compared to white people, and that black and Hispanic people breathe far more air pollution than they make, this new study breaks it down by source of pollution.
The researchers sorted the Environmental Protection Agency's emissions inventory of over 5,000 types of fine particulate matter into 14 sources such as industry, passenger cars, diesel trucks, construction, and agriculture. Then they modelled exposure to those pollution sources by calculating average ambient air quality levels for racial groups based on their residential locations in 2014.
"Given that we have this national inequity in pollution exposure, what [sources are] actually driving that?" Hill said. "What this paper shows is that it's pretty much everything."
When looking at exposure disparities in urban areas, researchers found a notable exception: Asians are less exposed to particulate matter than average in urban areas in California such as San Francisco, Los Angeles and San Jose. The study didn't examine the cause of this, said lead author Christopher Tessum, an environmental engineering professor at University of Illinois Urbana-Champaign.
This study appeared days after President Joe Biden convened a summit of world leaders to discuss emissions reductions, as well as shaping policy to protect vulnerable communities like ones disproportionately exposed to air pollution.
Hill said policymakers can use the study's findings to help make the case for tougher federal and state standards for regulating air pollution.
"This is something that needs to be done at a national level," he said in an interview.
Said University of Virginia Economics Professor Jonathan Colmer: "By decomposing disparities in fine particulate matter into their component sources, their research shines a light on where researchers, policymakers, and communities might focus efforts going forward." Colmer, lead author on a 2020 paper about disparities in air pollution, was not part of the new study.
Other researchers said the study illustrates racial disparities in air pollution exposure that can't be explained by income level. Mohai said studies have shown race was a greater predictor of exposure than income, but he's unaware of any others that show racial disparities at each income level.
He said the disparities in air pollution exposure are part of "a long history of slavery and racial discrimination in the US".
"We started to see a pattern with the history of racial discrimination and segregation of industry being located where people of colour are concentrated," Mohai said. "Racism isn't just about racial animus. It's about not caring about the welfare of people of other races - and I think that's been a factor."