Industrialized and large developing countries, especially China, India, and Brazil, produce staggering quantities of agricultural and industrial chemicals. Some of these chemicals are either toxic to start with or become toxic after their use in the industrial operations. Many of these chemicals are intentionally or unintentionally discharged into the environment, thus contaminating water, soil, and sediments. Incidents range from industrial chemical waste contamination at Love Canal, New York, to halogenated hydrocarbons and pesticide in groundwater to oil spills in Prince William Sound, Alaska. In addition, shipping of huge quantities of organic chemicals to different parts of the world has the potential of causing a worldwide environmental problem. While some degradation of organic chemicals may be due to abiotic mechanisms, for example, photochemical reactions in aquatic environments, most of the degradation of organic chemicals is by indigenous microbial populations.

In natural environment, a chemical may be present at a level, which on its own would cause no harm, but upon interaction with other chemicals may become much more toxic. For example, in production of petrochemical smog, ultraviolet light from the Sun, in the presence of oxygen, hydrocarbons, and nitrogen oxide interact to form peroxyacyl nitrates that are much more toxic than hydrocarbons or nitrogen oxide alone; this is known as synergism. On the other hand, there are also cases when potentially toxic substances may interact to counter each other's effect known as antagonism.

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10 Ways To Fight Off Cancer

10 Ways To Fight Off Cancer

Learning About 10 Ways Fight Off Cancer Can Have Amazing Benefits For Your Life The Best Tips On How To Keep This Killer At Bay Discovering that you or a loved one has cancer can be utterly terrifying. All the same, once you comprehend the causes of cancer and learn how to reverse those causes, you or your loved one may have more than a fighting chance of beating out cancer.

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