CD-ROM version of the 4th ed. of the handbook containing environmental data for over 3,000 organic chemicals, presented in HTML format. Arranged in alphabetical order by chemical name, this reference provides synonyms, CAS numbers, and molecular and structural formulas. Natural and manmade sources of a substance as well as its uses and various formulations appear. Each substance is categorized by physical and chemical properties, air pollution factors, water and soil pollution factors, and biological effects. Pesticides, detergents, phtalates, polynuclear aromatics, and polychlorinated biphenyls are all investigated in detail. Also includes aquatic toxicity and biological effects, odor thresholds, sampling and analysis data, and on-screen help.