In this book, the authors gather topical research from across the globe, in the study of the properties, applications and health effects of chlorine. Topics discussed in this compilation include the influence of oxygen, ozone and chlorine on spectral characteristics of water clusters; the heterogeneous source of chlorine in the troposphere; the kinetics and products formed from the oxidation of organic compounds by chlorine dioxide; chlorine disinfection by-products in swimming pools; the hydration and diffusion of chlorine and its effects on hydrogen bonding structure and kinetics in cryoprotective agent aqueous solutions; the electro-optical and thermophysical properties of chlorine; substances produced by chlorine treatments; acute chlorine gas poisoning and substitutive and additive oxydative chlorination catalysed by substituted iron phthalocyanines.