However, the current review of health studies has not identified compelling evidence for more stringent standards. (energytomorrow.org)
Indeed, only recently have rigorous health studies on the impact of unconventional natural gas development on health been completed. (businessinsider.com)
Well - established health impact functions used in public health studies provided the rate of change between reductions in PM - 2.5 and estimates of the number of health outcomes. (newscenter.lbl.gov)