Equal Exposure, Unequal Impact: For First Time, Mount Sinai Researchers Show How Air Pollution Causes Greater Bone Loss in Some Women 50+
Study Published Today Finds Neighborhood Socioeconomic Conditions Significantly Amplify Pollution-Related Bone Loss
Mount Sinai’s Diddier Prada, MD, PhD, was inspired to study the connection between pollution and bone health after seeing the impact of heavy air pollution on his mother’s health in his hometown of Bucaramanga, Colombia.
A landmark study published today in Frontiers in Public Health found that neighborhood socioeconomic conditions dramatically influence how air pollution affects bone health among postmenopausal women.
In one of the largest U.S. studies to examine this relationship, researchers at the Icahn School of Medicine at Mount Sinai found that women in lower neighborhood-level socioeconomic status (nSES) communities experienced up to three times greater bone mineral density loss from the same levels of air pollution exposure than women living in higher-income neighborhoods.
Researchers at Mount Sinai’s Institute for Health Equity Research analyzed data from 9,041 postmenopausal women enrolled at 40 U.S. clinical sites participating in the Women’s Health Initiative (WHI). They found that women living in lower-socioeconomic neighborhoods experienced significantly greater bone mineral density loss associated with exposure to nitrogen oxides (NOx) and sulfur dioxide (SO2) than women living in wealthier communities. These pollutants are commonly associated with vehicle traffic and industrial emissions. According to the American Lung Association, nearly half of the U.S. population lives in areas with unhealthy or suboptimal air quality.
“These findings show that air pollution does not affect everyone equally,” said first author Diddier Prada, MD, PhD, Assistant Professor of Population Health Science and Policy, and Environmental Medicine, at the Icahn School of Medicine at Mount Sinai, who initiated the research through Mount Sinai’s Institute for Health Equity Research. "Women living in socioeconomically disadvantaged neighborhoods experienced substantially greater bone loss despite similar pollution exposure. Our findings underscore how environmental and social conditions work together to influence long-term bone health."
Dr. Prada and colleagues note that osteoporosis-related fractures affect an estimated 2.1 million Americans annually and generate approximately $22 billion in direct health care costs each year.
“Our understanding of bone health continues to evolve,” Dr. Prada said. “Women who experience osteoporosis and related fractures experience reduced quality of life, additional health complications, and an increased risk of death. These findings expand our understanding of how environmental exposures and neighborhood conditions together influence healthy aging.”
Key findings:
- A 10 percent increase in nitrogen dioxide (NO₂) exposure was associated with nearly four times greater lumbar spine bone mineral density loss among women living in the lowest neighborhood socioeconomic status communities compared with those living in the highest.
- Whole-body bone mineral density declined approximately 3.8 times more among women living in lower-nSES communities exposed to nitric oxide (NO), highlighting the important role neighborhood conditions may play in shaping biological risk.
- At the hip, where bone loss substantially increases fracture risk, a 10 percent increase in nitrogen dioxide (NO₂) exposure was associated with approximately 1.6 times greater bone mineral density loss among women living in lower-nSES communities. Similar findings were observed for nitric oxide exposure across one-, three-, and five-year exposure averages.
For Dr. Prada, this research is deeply personal. Growing up in a low-income neighborhood in Bucaramanga, Colombia, near a cement factory with persistent air pollution, he witnessed neighbors developing respiratory disease and cancer. After menopause, his mother experienced multiple fractures before being diagnosed with osteoporosis. Following treatment, including osteoporosis medication, she regained bone health and today is thriving at age 78. Those experiences inspired Dr. Prada to investigate how environmental exposures contribute to bone disease and health disparities.
Dr. Prada's earlier research has progressively strengthened the evidence linking air pollution to bone health. His 2017 study in The Lancet Planetary Health demonstrated that particulate matter and black carbon exposure were associated with lower bone mineral density and increased fracture-related hospitalizations. Subsequent studies identified nitrogen oxides—particularly nitric oxide and nitrogen dioxide—as stronger predictors of bone loss than particulate matter alone and documented metabolic pathway changes associated with these exposures.
The current study extends that body of work by demonstrating that neighborhood socioeconomic conditions substantially modify the effects of pollution on bone health.
The findings also highlight an important health equity challenge. Although Black women in the United States have historically been found to have higher bone mineral density than white women, they experience significantly higher mortality following osteoporotic fractures. The disparity underscores the influence of structural barriers, differences in access to preventive care and treatment, and the cumulative effects of social and environmental disadvantage on health outcomes.
"Our findings demonstrate that the health effects of air pollution are shaped not only by environmental exposure, but also by the communities where people live," Dr. Prada said. "Multiple factors likely contribute to this disparity, including greater proximity to pollution sources, housing conditions that may allow more outdoor pollutants indoors, and barriers to preventive care and osteoporosis screening. Understanding these interconnected factors can help inform strategies to reduce health disparities and improve bone health among aging women."
About the Icahn School of Medicine at Mount Sinai
The Icahn School of Medicine at Mount Sinai is internationally renowned for its outstanding research, educational, and clinical care programs. It is the sole academic partner for the seven member hospitals* of the Mount Sinai Health System, one of the largest academic health systems in the United States, providing care to New York City’s large and diverse patient population.
The Icahn School of Medicine at Mount Sinai offers highly competitive MD, PhD, MD-PhD, and master’s degree programs, with enrollment of more than 1,200 students. It has the largest graduate medical education program in the country, with more than 2,700 clinical residents and fellows training throughout the Health System. The Graduate School of Biomedical Sciences offers 12 degree-granting programs, conducts innovative basic and translational research, and trains more than 470 postdoctoral research fellows.
Ranked 11th nationwide in National Institutes of Health (NIH) funding, the Icahn School of Medicine at Mount Sinai is among the 90th percentile of U.S. private medical schools in Sponsored Programs Direct Expenditures per Principal Investigator, according to the Association of American Medical Colleges. More than 6,900 scientists, educators, and clinicians work within and across dozens of academic departments and multidisciplinary institutes with an emphasis on translational research and therapeutics. Through Mount Sinai Innovation Partners (MSIP), the Health System facilitates the real-world application and commercialization of medical breakthroughs made at Mount Sinai.
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