Cardiovascular disease (CVD) continues to be one of the leading causes of death in the United States. While its biomedical causes have been well-documented, this study expands the discourse by examining the intersection between air pollution—particularly fine particulate matter (PM2.5)—and socioeconomic status (SES). It reframes CVD as not merely a medical condition, but as a public health outcome shaped by socio-structural inequality and environmental injustice.
Communities with lower income, poorer healthcare access, and diminished political capital are disproportionately located in over-populated areas prone to increased pollution. These communities face dual vulnerabilities: they are more exposed to pollutants and less equipped to mitigate their health impacts.
Cardiovascular disease (CVD) is a class of diseases that affect the heart or blood vessels in simple terms. These conditions include but are not limited to coronary artery disease , stroke, heart failure and hypertension (more likely a risk factor). CVD is a critical public health concern due to its high prevalence and substantial impact on morbidity and mortality, contributing significantly to healthcare costs and reduced quality of life. An understanding of its determinants is essential for developing effective prevention, intervention strategies and for healthier communities.
Air pollution, particularly fine particulate matter (PM2.5), has emerged as a significant environmental risk factor for CVD. PM2.5 refers to minute airborne particles that are 2.5 micrometers in diameter or less. These particles can be inhaled through the bronchi, bronchioles and alveoli of the lungs, entering the bloodstream and triggering a cascade of adverse physiological responses.
The vascular impacts of PM2.5 exposure are well documented with associations with increased inflammation, oxidative stress, endothelial dysfunction, and altered blood coagulation (Krittanawong et al.,). These processes contribute to the development and progression of atherosclerosis, hypertension, and CVD.
Socioeconomic status (SES) is a multifaceted social construct encompassing various socio-economic factors significantly influencing individuals and communities. Key indicators of SES include; 1) income, which affects access to essential resources such as healthcare, healthy food, and housing; 2) education, which shapes health literacy, employment prospects, and health-promoting behaviors; and 3) healthcare access, which determines the availability and quality of medical services for disease prevention, diagnosis, and treatment. Notably, lower socioeconomic status is frequently associated with increased exposure to risk factors for cardiovascular disease.
The confluence of elevated particulate matter 2.5 levels and low socioeconomic status (SES) carries significant implications for both public health and social justice. Communities characterized by lower SES frequently experience a disproportionate burden of cardiovascular disease (CVD). This disparity can be related to increased exposure to environmental pollutants coupled with diminished access to resources that could otherwise mitigate adverse health effects. The inequitable distribution represents a critical environmental injustice wherein marginalized populations are unjustly subjected to elevated health risks. Consequently, effectively addressing the multipronged challenge of CVD needs a holistic approach that integrates both biomedical and socio-environmental determinants.
This study analyzes data from 2,132 U.S. counties, using a cross-sectional approach to identify how geography, poverty, and pollution converge to produce avoidable, unequal mortality outcomes.This paper contributes to the growing body of research emphasizing the need for social justice policies that protect vulnerable populations and address health disparities driven by structural inequality.
We attempt to ascertain the association between air pollution(PM2.5), socioeconomic factors (poverty, education, and health insurance) and cardiovascular mortality rates in the U.S and how hypertension mortality rate influences cardiovascular mortality rates in the U.S. With the use of open source data, we examined rates for cardiovascular mortality, hypertension, poverty, lack of health insurance,population with high-school education and above. Our examination of these variables were largely as expected; with communities with lesser formal education being associated with higher cardiovascular mortality rate. States with higher PM2.5 rates also showed a higher CMR while hypertension mortality rates did not influence cardiovascular mortailty rate which was also evident in our graphs and plots. This study adopts a multifactorial framework, emphasizing how environmental and social stressors interact in a way that intensifies harm beyond their individual effects.
The analysis draws from nationally verified data sources:
Data was cleaned, merged using FIPS codes, and analyzed using Python-based tools. Key engineered features include uninsured rates, education levels, and poverty rates. The timeline was constrained to 2009–2010 to maintain alignment and statistical relevance across datasets.
Exploratory anslysis, descriptive statistics, correlation analysis,regression models and visualizations were done to reveal trends in our cross-sectional analysis of data from year 2009 and 2010.
Lack of causality due to the snap-shot nature of cross-sectional data.
Our findings reveal that impact of socioeconomic disparities are as significant as pm2.5 exposure on CMR. A few southern states ranked high on pollution and cardiovascular mortality, and low on income and education, suggesting geographic clustering of socio-environmental injustice associated with increased cardiovascular disease mortality rate.
PM2.5 exposure was a statistically significant predictor of cardiovascular mortality.Higher PM2.5 exposure is associated with increased cardiovascular mortality, reinforcing concerns about air pollution's influence on heart disease and its mortality rate.
SES emerged as a risk multiplier showing lower-income locations with higher uninsured populations and lower educational attainment had elevated CVD mortality rates. This supports the concept of multifactorial cumulative disadvantage—where multiple vulnerabilities intersect to worsen adverse health outcomes.
While our visualizations suggest a potentially weak direct influence of overall hypertension mortality rates on cardiovascular mortality rates—an expected finding given the multifactorial nature of CMR, which can be linked to various factors sometimes interrelated with hypertension—our regression model revealed a statistically significant positive relationship between hypertension-related death rates and cardiovascular mortality rates. However, there were implications that other significant conditions or factors, such as PM2.5 levels and broader socioeconomic determinants, likely exert substantial influence and warrant further investigation.
It is important to note that these are ecological correlations. While they can suggest potential relationships at the population level, they do not establish individual-level causation. Further individual-level studies would be needed to confirm these associations and understand the underlying mechanisms.
This paper concludes that the study of socioeconomic status (SES) and PM2.5 exposure on cardiovascular disease (CVD) mortality rates in the U.S. reveals a significant interplay where lower SES exacerbates the negative health effects of air pollution, influencing higher cardiovascular death rates in communities. Addressing this requires a fundamental four-year policy shift involving stricter air quality regulations prioritizing burdened, low-SES areas, expanded healthcare access, investments in community education and green jobs, and permit reforms mandating equity impact assessments. The proposed implementation emphasizes community involvement and rigorous evaluation, advocating for proactive prevention and the dismantling of systemic inequalities to achieve socio-environmental and health justice.