This two-volume work discusses environmental health, the branch of public health concerned with all aspects of the natural and built environment affecting human health, and addresses key issues at the global and local scales. The work offers an overview of the methodologies and paradigms that define this burgeoning field, ranging from ecology to epidemiology, and from pollution to environmental psychology, and addresses a wide variety of global concerns including air quality, water and sanitation, food security, chemical/physical hazards, occupational health, disease control, and injuries. The authors intend to provide up-to-date information for environmental health professionals, and to provide a reference for students and consultants working at the interface between health and environmental sectors. Volume 1 focuses on discussing the fundamentals of physical, chemical, and biological sciences in an environmental health context, and introduces the key concepts that bridge environmental health and medical sciences to accurately inform both environmental and medical professionals. The book addresses different specializations in medical science that account for environmental health issues, and aims to reduce the knowledge gap among professionals on public health topics such as pollution impacts, occupational hazards, radiation exposure, natural disasters, and climate change.