• Study examines disparities in air pollut

    From ScienceDaily@1:317/3 to All on Wed Mar 23 22:30:44 2022
    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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