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requiring lead-free gasoline or asbestos-free car brake linings or building materials); steering on desirable applied sciences (for example, providing greatest-follow manuals); or economic devices that make using more polluting technologies more expensive than using less polluting applied sciences . Figure 43.1 reveals 5 levels at which actions could be taken to stop the health effects of environmental hazards. Some would label interventions at the driving drive level as policy instruments. These embrace legal restrictions on using a poisonous substance, similar to banning the usage of lead in gasoline, or neighborhood-degree policies, such as boosting public transportation and lowering particular person use of motor automobiles. Another major supply of industrial water air pollution is mining. The grinding of ores and the next processing with water result in discharges of fantastic silt with poisonous metals into waterways until correct precautions are taken, corresponding to using sedimentation ponds. Lead and zinc ores normally comprise the much more toxic cadmium as a minor element. If the cadmium is not retrieved, main water pollution can occur. Mining was the source of many of the widespread cadmium poisoning (Itai-Itai illness) in Japan in 1940–50 . Another major source of ingesting water is groundwater, which often has low concentrations of pathogens as a result of the water is filtered during its transit through underground layers of sand, clay, or rocks. However, toxic chemicals corresponding to arsenic and fluoride can be dissolved from the soil or rock layers into groundwater. Direct contamination can also occur from badly designed hazardous waste websites or from industrial websites. In the United States in the 1980s, the federal government set in motion the Superfund Program, a major investigation and cleanup program to deal with such websites (U.S. Environmental Protection Agency 2000). Leaded gasoline creates excessive lead exposure circumstances in city areas, with a threat for

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