Olympic Park was chosen for its quiet because air tourism there is still nascent

Evidence

Olympic National Park was chosen for One Square Inch because it has a diverse natural soundscape combined with substantial periods of natural quiet. Unlike other national parks, such as Yellowstone, Grand Canyon, or Hawaii Volcanoes, where noise debates are long standing, air tourism at Olympic is still in its infancy. It has no through roads, no scenic drive to its highest peak. To reach its backcountry, you must go on foot. Because there are few noise intrusions in this wilderness, noise sources are easier to identify than at other parks. — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 59 (#expands, via linked claim)

Olympic National Park retains much of its natural quiet for one reason: overcast skies. The region has more than 200 completely cloudy days each year, and even more partially cloudy days that go uncounted. Many of those cloudy days are also rainy days. Rain, and lots of it, is a big deterrent to selling tickets for scenic tours. — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 70 (#expands, via linked claim)

Categorization

• corroborated: 2 independent passages support this claim
• XREF: connects to: Olympic National Park’s quiet stems from lacking roads and air tourism — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 59; Overcast skies protect Olympic Park’s quiet by deterring scenic flights — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 70; Cloud cover and rain protect Olympic Park from noise by discouraging scenic flights

Related

• Cloud cover and rain protect Olympic Park from noise by discouraging scenic flights (similarity 0.98)
• Olympic National Park’s quiet stems from lacking roads and air tourism (similarity 0.97)
• Overcast skies protect Olympic Park’s quiet by deterring scenic flights (similarity 0.91)
• Olympic is the quietest unit in the National Park Service’s 84 million acres (similarity 0.88)
• Aircraft noise dissipates with altitude but regulatory floors fail where tours fly low (similarity 0.78)

Broader Connections

• Olympic National Park’s quiet stems from lacking roads and air tourism #expands (0.90) — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 59
• Overcast skies protect Olympic Park’s quiet by deterring scenic flights #expands (0.80) — Gordon Hempton, John Grossmann, One Square Inch of Silence- One Man’s…, 70
• Cloud cover and rain protect Olympic Park from noise by discouraging scenic flights #expands (0.80)