This book is a collection of studies on selected applications and new techniques in gas chromatography. Diverse uses varying from basic biological applications to industrial uses have been overviewed in this book. Analysis of multidimensional gas chromatography - time of flight mass spectrometry of PAH in smog chamber studies and in smog samples, inverse gas chromatography in characterization of composites interaction has been presented in detail. The various topics have been addressed by masters from diverse spheres and supplemented by easy-to-understand figures and tables. It has been specially purposed for chemists and other practitioners working in the domains related to gas chromatography. This book is a valued resource for both budding and expert chromatographers.