You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following is/are the source/sources of H2S in the environment? and explain in detail?
H2S is formed during coke production, viscose rayon production, wastewater treatment plants, wood pulp production using the sulphate method, extraction process, oil refining and in the tanning industry. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 794