Study links air pollution to drop in national park visitors
newsdepo.com
DENVER (AP) - Visitors appear to be steering clear of some U.S. national parks or cutting visits short because of pollution levels that are comparable to what's found in major cities, according to a study released Wednesday. Researchers at Iowa State and CornStudy links air pollution to drop in national park visitors
DENVER (AP) - Visitors appear to be steering clear of some U.S. national parks or cutting visits short because of pollution levels that are comparable to what's found in major cities, according to a study released Wednesday. Researchers at Iowa State and Cornell universities looked at more than two decades ... Read more