Study examines disparities in air pollution affecting American Indian communities
First study to shed light on ambient particulate matter in tribal lands
across the U.S.
Date:
March 23, 2022
Source:
Columbia University's Mailman School of Public Health
Summary:
New research highlights disparities in fine particulate matter
(PM2.5) trends between American Indian (AI) and non-AI populated
U.S. counties.
PM2.5 is one of several air pollutants regulated by the U.S. EPA.
Downward trends in PM2.5 concentrations were steeper among the
non-AI populated compared to AI-populated counties. With most
U.S. air pollution research conducted in urban settings, this is the
first study to detail the extent of particulate air pollution levels
and its potential health consequences among rural AI communities.
FULL STORY ==========================================================================
A new study at Columbia University Mailman School of Public Health
highlights disparities in fine particulate matter (PM2.5) trends between American Indian (AI) and non-AI populated counties of the U.S. PM2.5
is one of several air pollutants regulated by the U.S. Environmental
Protection Agency (EPA), with the current annual standard set at
12?g/m3. Downward trends in PM2.5 concentrations were steeper among the
non-AI populated compared to AI-populated counties. Although AI-populated counties had lower PM2.5 concentrations than non- AI populated counties
in 2000, by 2018, their levels were higher. With most U.S. air pollution research conducted in urban settings, this is the first study to detail
the extent of particulate air pollution levels and its potential health consequences among rural AI communities. The findings are published in
the American Journal of Public Health.
==========================================================================
"Our results underscore the need to strengthen air pollutionregulations
and prevention implementation in tribal territories and areas where
AI populations live," said Maggie Li, PhD candidate in the Department
of Environmental Health Sciences at Columbia Mailman School, and first author."Until now, insight into PM2.5 exposure burdens in AI communities
has been limited, in turn contributing to the lack of air pollution epidemiological studies which include this population in the contiguous
U.S." The researchers compared ambient PM2.5 average concentrations and
trends in AI- populated vs. non-AI-populated counties in the contiguous
U.S. from 2000 to 2018. They conducted their analysis at the county level,
the most relevant unit to inform regulatory action. Population data and household income were obtained from the U.S. 2010 Census.
Average concentrations were 1.46 ?g/m3 lower for modeled PM2.5 in
AI-populated counties vs. non-AI-populated counties in 2000; however,
towards the end of the study period, PM2.5concentrations in AI-populated counties became significantly higher compared to non-AI-populated
counties. By 2018, concentrations were on average 0.66myg/m3higher
in AI-populated counties than non-AI-populated counties. "Although we
observed that average PM2.5 concentrations were higher in non-AI-populated counties at baseline and across most of the study period, the gap between
AI- and non-AI-populated counties decreased over time; after approximately 2015, average PM2.5 concentrations were higher in AI-populated counties," observed Li.
Short- and long-term exposure to particulate matter ? 2.5 mym (PM2.5)
increases the risk of cardiovascular and respiratory disease, among
other health outcomes. In the U.S., socioeconomically disadvantaged
communities are often exposed to higher PM2.5 exposure levels. They
bear a disproportionate burden of disease, even at levels well below
air quality standards set by the U.S.
Environmental Protection Agency.
"Our findings build upon existing studies showing that socioeconomically disadvantaged communities experience disproportionate burdens of
environmental hazards, such as ambient air pollution. Native Americans
may be particularly susceptible to the adverse health effects of PM2.5
and air pollution, but research quantifying air pollution exposures and
impacts on health among this population is lacking," said Marianthi-Anna Kioumourtzoglou, ScD, assistant professor of environmental health sciences
at Columbia Mailman School, and senior author. "These communities already
face a large disease burden attributable to environmental pollution due,
for instance, to extensive mining and water contamination on Tribal
Lands." Cardiovascular disease, one of the outcomes associated with
exposure to PM2.5, and the leading cause of death in AI populations,
occurs at significantly higher rates than in white populations. "There
is a critical need for future investigations of health impacts associated
with air pollution exposure in AI populations, as well as of interventions
to ensure the observed inequalities can be eliminated," noted Ana
Navas-Acien, MD, PhD, professor of environmental health sciences at
Columbia Mailman School, and a senior co-author.
Co-authors are Markus Hilpert, Jenni A. Shearston, and Jeff Goldsmith,
Columbia University Mailman School of Public Health; Jada Brooks,
the University of North Carolina School of Nursing at Chapel Hill;
Steven Chillrud, Lamont- Doherty Earth Observatory, Columbia University; Tauqeer Ali, University of Oklahoma Health Sciences Center; Jason Umans, Georgetown-Howard Universities Center for Clinical and Translational
Sciences; Lyle Best and Joseph Yracheta, Missouri Breaks Industries
Research, Inc.; Aaron van Donkelaar and Randall Martin, Department of
Energy, Environmental & Chemical Engineering, Washington University at
St. Louis.
Support for the study was provided by the National Institute of
Environmental Health Sciences, grants T32 ES007322, P30 ES09089, R01
ES030616, and P42ES010349.
========================================================================== Story Source: Materials provided by Columbia_University's_Mailman_School_of_Public_Health.
Note: Content may be edited for style and length.
========================================================================== Journal Reference:
1. Maggie Li, Markus Hilpert, Jeff Goldsmith, Jada L. Brooks, Jenni A.
Shearston, Steven N. Chillrud, Tauqeer Ali, Jason G. Umans, Lyle
G. Best, Joseph Yracheta, Aaron van Donkelaar, Randall V. Martin,
Ana Navas-Acien, Marianthi-Anna Kioumourtzoglou. Air Pollution
in American Indian Versus Non-American Indian Communities,
2000-2018. American Journal of Public Health, 2022; 112 (4):
615 DOI: 10.2105/AJPH.2021.306650 ==========================================================================
Link to news story:
https://www.sciencedaily.com/releases/2022/03/220323160656.htm
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