Environmental Epidemiology

Environmental epidemiology applies population‐level methods to quantify how external exposures—from air and water pollutants to extreme temperatures and chemical hazards—affect human health. By integrating routine health records, environmental monitoring and targeted surveys, it reveals associations between exposures and outcomes ranging from acute respiratory events and heat‐related illness to chronic diseases such as lung cancer, cardiovascular disorders and neurodegeneration. Key strengths include the ability to study real‐world, low‐level and mixed exposures, to identify susceptible subpopulations and to evaluate the health impacts of policies and interventions. Modern advances in geospatial analysis, high‐throughput biomonitoring and statistical modelling permit finer resolution of exposure–response relationships, while interdisciplinary collaboration with toxicologists, engineers and social scientists helps address methodological challenges such as confounding, exposure misclassification and the timing of critical windows. Environmental epidemiology thus plays a central role in informing regulatory standards, guiding public‐health preparedness and advancing preventive strategies to reduce disease burden worldwide.

Research from Nature Portfolio

Researchers have demonstrated that global trade networks magnify the economic and health costs of future extreme heat. By linking climate projections with epidemiological and economic models, they show that heat‐related health losses constitute over a third of anticipated GDP reductions by mid‐century, with developing regions in Africa hit hardest and supply‐chain disruptions amplifying impacts in manufacturing economies. In another study, the summer 2022 heatwave in Europe was found to cause approximately 62 000 excess deaths—the highest toll on record—disproportionately affecting older women and areas of Italy, Spain and Germany. This work underscores the urgency of strengthening heat‐surveillance systems and adaptation strategies. A third investigation reveals that fine particulate matter (PM2.5) acts as a tumour promoter in never‐smokers by triggering macrophage‐mediated interleukin-1β release and creating a progenitor‐like state in EGFR-mutant lung epithelial cells, thereby accelerating lung adenocarcinoma development.

Research from all publishers

A systematic review and meta‐analysis in The BMJ confirms that short‐term rises in PM2.5, PM10, nitrogen dioxide and sulphur dioxide are followed within 24 hours by significant increases in stroke admissions and mortality, highlighting the need for rapid public‐health responses to air quality alerts. A large Canadian cohort study (2015) links long‐term exposure to PM2.5, ozone and NO2 with elevated non‐accidental and cardiovascular mortality over 16 years, emphasising the cumulative burden of mixed pollutants across residential histories. Global burden estimates published in The Lancet Planetary Health (2021) attribute over five million annual deaths to non‐optimal ambient temperatures—predominantly cold but with a growing heat‐related fraction—underscoring regional disparities and the imperative for tailored preparedness under a changing climate.

Environmental Epidemiology publication trend

The graph below shows the total number of articles in environmental epidemiology across all publications each year (not limited to Nature Index journals).

Technical terms

Environmental epidemiology: The study of how environmental exposures influence the distribution and determinants of health and disease in populations.

Relative risk (RR): The ratio of the probability of an outcome occurring in an exposed group to that in an unexposed group.

Confounding factor: A variable that is associated with both the exposure and the outcome, potentially distorting their observed relationship.

Incidence: The rate at which new cases of a disease occur in a defined population over a specified period.

Prevalence: The proportion of a population that has a particular disease or condition at a given point in time.

Disability‐adjusted life‐year (DALY): A measure combining years of life lost due to premature death and years lived with disability to quantify overall disease burden.

References

1. Global supply chains amplify economic costs of future extreme heat risk. Nature (2024).
2. Heat-related mortality in Europe during the summer of 2022. Nature Medicine (2023).
3. Lung adenocarcinoma promotion by air pollutants. Nature (2023).
4. Short term exposure to air pollution and stroke: systematic review and meta-analysis. The BMJ (2015).
5. Ambient PM2.5, O3, and NO2 Exposures and Associations with Mortality over 16 Years of Follow-Up in the Canadian Census Health and Environment Cohort (CanCHEC). Environmental Health Perspectives (2015).
6. Global, regional, and national burden of mortality associated with non-optimal ambient temperatures from 2000 to 2019: a three-stage modelling study. The Lancet Planetary Health (2021).