Coal and Coal ash from the Illinois basin had the best levels of radioactivity, followed by the Appalachian basin and the Powder River basin in Wyoming and Montana. The study was published recently in the journal Environmental Science & Technology. Presently, coal ash is unregulated in the United States and is stored in coal-fired plants’ holding ponds and landfills. The Environmental Protection Agency’s first-ever regulations on coal ash disposal are established to begin with in October, the researchers said. Until now, metals and contaminants such as for example arsenic and selenium have already been the main known contaminants of concern in coal ash, said study co-author Avner Vengosh in a university information release. This study raises the possibility we have to also be looking for radioactive components, said Vengosh, who is a professor of geochemistry and water quality at Duke’s Nicholas College of the Environment..The surveys were completed between May 2013 and April 2014. The research team cautions that although the findings show a link between rest and the usage of alcohol and marijuana, it is not possible to determine cause from effect without extra research. The RAND team is currently collecting long-term study data to study whether sleep problems predict or lead to the onset of alcoholic beverages and/or marijuana use in teens. Regarding sleep even more among adolescents generally, RAND researchers suggest that both individual-level prevention strategies in addition to policy-level strategies are needed to improve adolescent rest.