Environmental health

# Environmental Health Domain Description

Environmental health encompasses the study and management of how external environmental factors—including air quality, water safety, chemical exposures, electromagnetic fields, noise, light exposure, temperature, and microbial contamination—affect human health and wellbeing. This domain matters because environmental exposures are largely beyond individual control yet profoundly influence disease risk, chronic health conditions, and quality of life. The World Health Organization estimates that environmental factors contribute to approximately 24% of global disease burden, making environmental health interventions a critical complement to individual-level health behaviors. Unlike some health domains where personal choices dominate outcomes, environmental health requires understanding both personal exposure reduction strategies and broader systemic factors that determine the quality of one's living and working environment.