Friis’ Essentials of Environmental Health offers a clear and comprehensive overview of the key topics in environmental health. Beginning with foundational concepts and essential methodologies such as environmental epidemiology, toxicology, and policy and regulation, the book then explores environmental diseases, including those caused by microbial agents and exposure to ionizing and non-ionizing radiation. Finally, it examines practical applications and domains within the field, including water and air quality, food safety, waste management, and occupational health. Now in its Fourth Edition, the book has been updated by a new team of authors—Neuberger, Pacheco, and Canales—to include the latest research, data, and reflect the Healthy People 2030 objectives. Each chapter ends with updated questions and exercises to help readers think more deeply about the material. Key Updates New chapter on Disasters examines natural vs. human-made disasters. New chapter on Climate Change covers greenhouse gases and their effects on humans and wildlife, changes in the Arctic/Antarctic, sea level rise, changes in allergens and mitigation efforts Expanded content on topics such as environmental justice, indoor/outdoor air quality and monitoring/control, water quality (including fluoridation controversies), radon, impacts on wildlife, occupational cancers, and more. Updated figures, tables, and data, case studies, and revised discussion questions.