Chemicals - There are over 15,000 chemical spills in the U.S. waterways each year and many of these are releasing chemicals that are incompatible with man and the equipment that is worn. As detailed information becomes available on this issue divers will become sensitized to the need for preventive measures before, during and after diving. At present the scientific and public safety diving communities are developing techniques for isolating the diver from the potential problems and decontaminating all exposed elements of the diving equipment. It appears eminent that the recreational community will feel the need to exert greater care in the future. It is becoming increasingly important to develop an understanding of the variations in the local conditions to which individuals expose themselves.
Some areas become particularly hazardous following heavy rains, hot weather and windstorms.
Local health authorities can usually be called for advice regarding any tests that have been performed and the results. They should also be able to identify areas of high concentrations of pollutants that should be avoided. When diving in areas where pollution is suspected or expected the following issues are worthy of evaluation. The individual diver should consider the need for appropriate vaccinations and inoculations. Pollution and filth are often associated.