An overview of the interdisciplinary field of environmental health sciences, including the study of how environmental factors impact human health and well-being.
Introduction to Environmental Health Sciences
Key concepts, scope, and foundational principles
| Element | Description |
|---|---|
| Definition | The interdisciplinary study of how physical, chemical, biological, and social environments affect human health and disease. |
| Goal | Identify, assess, and control environmental risk factors to protect and improve public health. |
| Core Disciplines | Toxicology, epidemiology, exposure science, risk assessment, occupational health, environmental engineering, policy & regulation. |
| Typical Settings | Communities, workplaces, schools, homes, natural ecosystems, and built environments. |
| Domain | Primary Focus | Typical Issues |
|---|---|---|
| Air Quality | Inhalation exposures | Particulate matter, ozone, nitrogen oxides, indoor pollutants (e.g., radon, mold). |
| Water & Sanitation | Ingestion exposures & hygiene | Microbial contamination, heavy metals, chemicals (pesticides, PFAS), water‑borne diseases. |
| Soil & Land | Contact & food chain pathways | Lead, arsenic, pesticide residues, contaminated sites, agricultural runoff. |
| Chemical Hazards | Toxic substances in all media | Industrial chemicals, endocrine disruptors, flame retardants, nanomaterials. |
| Radiation | Ionizing & non‑ionizing exposures | UV radiation, radon, medical imaging, electromagnetic fields. |
| Occupational Health | Workplace environments | Ergonomic stressors, chemical exposures, noise, shift work, psychosocial factors. |
| Built Environment | Urban design & housing | Traffic noise, heat islands, green space, housing quality, transportation. |
| Climate Change | Global‑scale impacts | Heat stress, vector‑borne disease, extreme weather, food security. |
Key concept: Dose = Concentration × Duration × Frequency (often expressed as mg/kg‑body‑weight/day).
(Often illustrated as a circular “risk assessment‑management” loop.)
| Tool/Method | Application | Example |
|---|---|---|
| Epidemiologic Studies | Link exposure to health outcomes | Cohort study of air‑pollution and asthma incidence. |
| Biomonitoring | Measure chemicals in biological media (blood, urine) | Detect BPA levels in pregnant women. |
| Environmental Monitoring | Quantify contaminants in air, water, soil | Continuous PM₂.₅ monitoring stations. |
| Geographic Information Systems (GIS) | Spatial analysis of exposure and disease |