Principles of Environmental Engineering & Science, authored by Susan Masten and published in the 4th edition by McGraw-Hill Higher Education on March 19, 2019, delves into the fundamental principles and practical applications of environmental engineering and science. This comprehensive text is designed to provide students with a thorough understanding of the environmental challenges facing society today, including air and water quality management, waste treatment, and sustainable resource use. The book covers key topics such as environmental laws and regulations, risk assessment, and ecological systems. It also emphasizes the integration of technology, policy, and social aspects in solving environmental issues, preparing readers for careers in this vital field.