Chemical agents, being at the core of modern industrial systems, has attained a very serious concern for disaster management within the government and community. Chemicals such as chlorine, which was used during World War I as chemical weapons — is also a key ingredient in numerous commercial products. Correct application of chemicals is very important. Appropriate use will be beneficial while misuse will bring disasters. This course will provide learners with an overview of issues in relation to chemical disasters due to industrial accidents, terrorism and war attack.