Denali has the clearest air of any monitored U.S. national park
Denali has the clearest air of any monitored U.S. national park By Ned Rozell [fusion_dropcap]F[/fusion_dropcap]airbanks's air turns bitter every winter as we fill it with woodsmoke and other things, but just down the road Denali National Park has the clearest air measured among America's monitored national parks. Scientists at Colorado State University have taken a [...]