This book is targeted towards evaluation of human activities that affects our environment. The environment must be sustained not for our generation alone but for generations yet unborn as we explore and exploit the natural resources which nature has endowed us. In our bid to sustain the environment, we need simple mathematical indices that can give us an insight as to the degree of pollution and contamination of the environment. This book is multidisciplinary in approach and can be use by all environmental practitioners to guage, feel the pulse of their level of activities on the environment by simple statistical methods and some indices. The language is simple for all to understand and will be appreciated by all.