Saturday, October 26, 2024

Curbing air pollution control devices save thousands of lives and billions of dollars


A new commentary in the American Journal of Public Health found that power plants’ use of these devices saved up to 9,100 lives and up to $100 billion in health costs in 2023.



Boston University School of Public Health




A new commentary found that power plants’ use of these devices saved up to 9,100 lives and up to $100 billion in health costs in 2023. These estimates reveal the substantial health benefits that could be at stake if the next presidential administration implements policies that aim to weaken the Clean Air Act and limit the regulatory authority of the EPA.

Air pollution control devices (APCDs) prevented up to 9,000 deaths and saved up to $100 billion in health costs in 2023, according to new estimates published in an American Journal of Public Health editorial.

But these public health benefits will be sharply reduced in future years if a future presidential administration implements the environmental policies outlined in Project 2025 and the America First Agenda, write researchers from Boston University School of Public Health (BUSPH), the Sierra Club, the Institute for the Environment at the University of North Carolina at Chapel Hill, and Columbia University Mailman School of Public Health.

Both far-right policy platforms are gunning to dismantle environmental regulations, including by weakening the Clean Air Act, the bedrock 1970 federal law that gives the Environmental Protection Agency (EPA) the authority to regulate emissions of major air pollutants at power plants. Thanks to EPA policies that require or encourage power plants to use APCDs, SOemissions decreased by 93 percent and NOx emissions dropped by 87 percent between 1995 and 2022, translating into a massive decline in coal-related excess deaths, from 40,000 in 2000 to 1,600 in 2020, the commentary states.

If Project 2025 and/or the America First Agenda federal policy platforms are adopted by the next administration, APCD use could plummet and severely jeopardize the health of the public, the authors argue.

“Air pollution control devices and other provisions of the Clean Air Act are a bedrock part of the public health infrastructure in the United States,” says Dr. Jonathan Buonocore, assistant professor of environmental health at BUSPH, and lead author of the commentary. “This work serves to remind us how important the Clean Air Act is, and that there are big public health benefits to protecting or strengthening it.”

To capture the environmental and health ramifications from a potential reduction in APCD use if Project 2025 or the America First Agenda is enacted, the team calculated changes in SO2  and NOemission levels based on a hypothetical “worst-case” scenario in which power plants ceased use of existing APCDs. 

The researchers estimated that SOemissions would be 2.9 times higher and NOreductions would be 1.8 times higher if power plants—many of which are coal-fired—stopped operating APCDs. The team used a reduced complexity model to estimate the health benefits from emissions reductions if APCD use continued at these plants. They found that, in 2023, APCDs at power plants captured about 1.2 million tons of SO2 and 1 million tons of NOx emissions, which would prevent between 3,100 and 9,000 premature deaths in 2023 and save between $35 billion and almost $100 billion in health costs.

"Power plants are not the highest contributors to air pollution-related public health risk anymore in the US, thanks to federal policies that drastically reduced the emissions of SO2 and NOx from this sector over this time period,” says Saravanan Arunachalam, Deputy Director, Institute for the Environment at the University of North Carolina at Chapel Hill. “Any future efforts to weaken the Clean Air Act may elevate this sector back to the top again, and further increase the overall disease burden for Americans.”

Even with these substantial health benefits, these models underestimate the additional health benefits of a reduction in emissions from APCD use, including lower risks of stroke, heart attacks, and asthma in adults, as well as low birth weight, preterm births, asthma onset, and other respiratory or developmental issues in children, the authors point out.

Although these health benefits are nationwide, the highest benefits occurred from emissions reductions at power plants in Appalachia, the Midwest, and the Mountain West. More than 85 percent of these reductions were attributed to a sharp decline in SO2, mostly from coal-fired plants. While the researchers note it is unlikely that future policy changes would eliminate all APCD use, these new estimates quantify the health consequences that are at stake—as well as the future health benefits that could remain—depending on changes to the EPA’s authority under a potentially weakened Clean Air Act.

“Health benefits from APCDs may be concentrated in specific locations, but these results show that strong environmental regulations benefit everyone,” says Dr. Mary Willis, assistant professor of epidemiology at BUSPH. 

Importantly, any future policies that strip the EPA of its current regulatory authority would also exacerbate racial inequities in health and likely curtail other climate policies at all levels of government, the authors write. Policies that reduce APCD use would heavily burden environmental justice communities, a majority of which are people of color or low-income populations who already experience the harms of other environmental hazards at disproportionate rates. Increases in power plant air pollution emissions would also offset gains in cities with climate action plans driving reductions in greenhouse gas emissions through the electrification of buildings and transportation.

The authors point out that federal policies that strip regulatory authority for harmful practices can lead to near-term health consequences.

“These misguided plans to unravel pollution protections and undermine the Clean Air Act would jeopardize the health and safety of millions," says Jeremy Fisher, principal advisor on climate and energy for the Sierra Club. "Lives are on the line and the American people deserve more thorough accountability and oversight of polluting power plants, not less."

Air pollution policy and climate policy are ultimately health policy, says Dr. Jonathan Levy, chair and professor of the Department of Environmental Health at BUSPH and senior author of the commentary. “These policy platforms targeting the EPA threaten to take us backward and make Americans less healthy.”

The commentary was also coauthored by Dr. Frederica Perera, professor emerita of environmental health sciences and special research scientist in the Department of Environmental Health Sciences at Columbia Mailman School of Public Health; Dr. Daniel Prull, deputy director of research, strategy and analysis for the Sierra Club; Dr. Patrick Kinney, Beverly Brown Professor of Urban Health at BUSPH; and Brian Sousa, research data analyst in the Department of Environmental Health at BUSPH.

Media Contacts:

Jillian McKoy, jpmckoy@bu.edu

Christopher Schuler, christopher.schuler@sierraclub.org

Emily Williams, emilywilliams@unc.edu

Timothy Paul, tp2111@cumc.columbia.edu

About Boston University School of Public Health

Founded in 1976, Boston University School of Public Health is one of the top ten ranked schools of public health in the world. It offers master's- and doctoral-level education in public health. The faculty in six departments conduct policy-changing public health research around the world, with the mission of improving the health of populations—especially the disadvantaged, underserved, and vulnerable—locally and globally.

About the UNC Institute for the Environment

The UNC Institute for the Environment (IE) develops multidisciplinary collaborations to understand major environmental issues and engage myriad academic disciplines, public and private partners, and an informed and committed community. Through IE’s air and water research centers, its public service and outreach, sustainability initiatives, and field sites and experiential education programs, the IE provides interdisciplinary forums for faculty, students and community partners to meet pressing environmental challenges. 

About the Sierra Club

The Sierra Club is America’s largest and most influential grassroots environmental organization, with millions of members and supporters. In addition to protecting every person's right to get outdoors and access the healing power of nature, the Sierra Club works to promote clean energy, safeguard the health of our communities, protect wildlife, and preserve our remaining wild places through grassroots activism, public education, lobbying, and legal action. For more information, visit www.sierraclub.org.

Asthma and fine particulate matter



Almost a third of asthma cases are attributable to long-term exposure to fine particular matter (PM2.5) according to a global meta-study



Max Planck Institute for Chemistry





Asthma is currently an incurable disease that severely impairs quality of life, with recurring symptoms such as wheezing, coughing, and shortness of breath. As of today, about 4 percent of the world’s population suffers from asthma, with more than 30 million new cases arising annually. Evidence suggests that long-term exposure to air pollution of fine particulate matter (PM2.5) is an important risk factor for developing asthma. However, inconsistencies in findings from earlier epidemiological studies have left this potential health risk open to debate, as some studies observed an increased risk while others found no association.

To resolve this controversy, Dr. Ruijing Ni, the first author of the study published today in the journal One Earth, and her colleagues at the Max Planck Institute for Chemistry have conducted a comprehensive global meta-analysis with researchers from China, the USA, and Australia. The research team determined the data from 68 epidemiologic studies from 2019 conducted across 22 countries, including those in North America, Western Europe, East Asia, South Asia, and Africa. They conclude that there is now sufficient evidence with high confidence level to support an association between long-term exposure to ambient PM2.5 and asthma.

11 percent of new cases of asthma in Germany are attributable to particulate matter

“We estimate that globally in 2019, almost a third of asthma cases are attributable to long-term PM2.5 exposure, corresponding to 63.5 million existing cases and 11.4 million new cases. In Germany, the pollution may have been responsible for 11 percent of new asthma cases, which corresponds to 28,000 people. We also find that the risk of asthma associated with PM2.5 is much higher in children than in adults, reflecting the age-related vulnerability”, says Dr. Ni.

Typically, the full maturation of lung and immune function is gradually completed until early adulthood. As a result, children may be more susceptible to air pollution exposure, which can lead to airway oxidative stress, inflammation, and hyper-responsiveness, as well as changes in immunological responses and respiratory sensitization to allergens. All these factors play a role in the development of asthma.

Further using these data, the research team established exposure-response curves for both childhood and adult asthma. Such curves are widely employed to quantitatively assess health risks by illustrating the relationship between the level of exposure to a particular substance, e.g., PM2.5 and the magnitude of the effect it produces, e.g., asthma risk. The exposure-response curves were determined by incorporating evidence from countries and regions across various income levels, which capture the global variation in PM2.5 exposure. “This initiative is important for quantifying global health effects of air pollution,” comments Prof. Yuming Guo, an epidemiologist from Monash University.

Countries with different income levels and particulate matter pollution considered

Populations in low- and middle-income countries (LMICs) are typically exposed to higher concentrations of air pollution and bear a greater burden of PM2.5. In contrast, research on the health effects of PM2.5 has been limited in these regions previously, with the majority of studies conducted in North America and Western Europe. Consequently, attempting a global health impact assessment of PM2.5 exposure necessitates extrapolating exposure-response associations observed in high-income countries to LMICs. The approach may introduce large uncertainty due to the differences in air pollution sources, healthcare systems, and demographic characteristics between high-income countries and LMICs.

The inclusion of evidence from several LMICs mitigates the limitation in approach and enables the exposure-response curves to be applicable to assess city- to global-scale attributable burden of asthma, as well as asthma health benefits associated with air pollution reductions, e.g., health benefits obtained from policy-driven reductions in air pollution under different scenarios.

“Our findings highlight the urgent need for policymakers to enforce stringent legislation to continuously combat air pollution, while personal protective measures, such as wearing masks, can also help reduce individual exposure and mitigate the risk of asthma,” emphasizes Prof. Yafang Cheng, the corresponding author of the study and the director at the Max Planck Institute for Chemistry.

The study was conducted by researchers from Max Planck Institute for Chemistry (Germany), Institute of Atmospheric Physics at the Chinese Academy of Sciences (China), University of Washington (USA), and Monash University (Australia).

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