This book has presented the atmospheric concentrations of 1,3-Butadiene and BTEX (Hazardous Air Pollutants) at traffic squares, petrol pumps and residential areas. Monitoring of BBTEX become important due to their tropospheric chemistry and risk pose to human healths. The correlation and concentration ratio studies helps to know the impacts of transportation emissions on commuters, workers and residential peoples. This book has five chapters : 1) Introduction 2) Materials and Methods 3) Result and Discussions 4) Conclusions and 5) Bibliography characterized by clear, methodological, step-by-step explanation of the topics. The data generated will help to all those engaged in similar work at government and private institute levels and will be useful for policy makers and planners.