Visibility/Haze Index for Mammoth Cave National Park
Visibility has improved at Mammoth Cave, inching downward since 2009. Mammoth Cave reached "fair" median visibility for the first time in 2021, according to National Park Service data.
15.5 deciviews (dv) and above is considered "poor" visibility for Mammoth Cave, according to NPS standards.
9.5 deciviews (dv) and below is considered "good" visibility for Mammoth Cave.