Environmental engineers study the effect of technological advances on the environment, addressing local and worldwide environmental issues such as acid rain, global warming, ozone depletion, water pollution and air pollution from automobile exhausts and industrial sources. Environmental engineering is a field of broad scope that draws on such disciplines as chemistry, ecology, geology, hydraulics, hydrology, microbiology, economics, and mathematics. Environmental engineering is the branch of engineering that is concerned with protecting people from the effects of adverse environmental effects, such as pollution, as well as improving environmental quality. Environmental engineers work to improve recycling, waste disposal, public health, and water and air pollution control. Environmental engineering is a sub-branch of Chemical engineering and Civil engineering that is concerned with the natural resource management, use of water, environmental pollution and human health. It is the study of problems associated with soil, air and water pollution. An environmental engineer is responsible for improving quality of environment, public health and develop solutions to minimize the degradation of natural resources. The book is useful for Degree as well as Diploma students and is also likely to be useful for practising engineers in this field.