“Bite-Size Bits of Local, National, and Global History”
“Bite-Size Bits of Local, National, and Global History”
Near Criglersville in Madison County, Virginia — The American South (Mid-Atlantic)


Visiblity-Endangered? Marker image. Click for full size.
By Craig Swain, October 4, 2008
1. Visiblity-Endangered? Marker
Inscription.  On a good visibility day, Stony Man Mountain and nearby hills may be seen cleary with the human eye.

On a poor visibility day, both natural conditions and air pollution obscures your view of Stony Man Mountain and distant views beyond.

The Blue Ridge
The bluish haze that gave these Blue Ridge Mountains their name was produced largely by forest vegetation. Millions of trees, and countless leaves, emit great amounts of moisture and natural chemicals into the air. They react with sunlight to form a natural visible suspension, or haze.

Today, this natural haze is almost insignificant compared to human-caused pollutants. These unnatural pollutants produce a whitish or brownish haze that obscures your view of nearby and distant mountains. It is believed that this human-caused atmospheric pollution is also having an adverse effect on the natural ecosystems in Shenandoah National Park.

The Sulfates
Power generating facilities, industrial boilers and current forms of transportation emit sulfur dioxide which is transformed in the atmosphere to sulfates. Sulfates account for more than 60% of the visible haze
Visiblity-Endangered? Marker image. Click for full size.
By Craig Swain, October 4, 2008
2. Visiblity-Endangered? Marker
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in Shenandoah. They are also linked to the formation of acid rain, Shenandoah's silent threat.

Acid rain has destroyed fish and plant life in hundreds of lakes and streams in the U.S. and Canada. Scientists believe that acid rain reduces plant growth and kills microorganisms in soils. It also releases metals from the soil which concentrate in the root system and damage the plant's ability to absorb water and available nutrients.
Erected by Shenandoah National Park.
Topics. This historical marker is listed in these topic lists: EnvironmentNatural Features.
Location. 38° 36.712′ N, 78° 21.772′ W. Marker is near Criglersville, Virginia, in Madison County. Marker is on Skyline Drive, on the left when traveling south. Located at the Stony Man Overlook, near Hughes River Gap, in Shenandoah National Park. Touch for map. Marker is in this post office area: Syria VA 22743, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies. Stony Man (a few steps from this marker); Old Man in the Mountain (a few steps from this marker); Appalachian Trail High Point (approx. one mile away); Civilian Conservation Corps (approx. 1.3 miles away); If These Walls Could Talk (approx.
The Haze image. Click for full size.
By Craig Swain, October 4, 2008
3. The Haze
Looking south down the Blue Ridge from the marker location. The haze mentioned on the marker is readily apparent.
1.6 miles away); Shenandoah's Centerpiece (approx. 1.7 miles away); Construction of the Skyline Drive (approx. 2.1 miles away); Old Rag (approx. 2.3 miles away).
Credits. This page was last revised on June 16, 2016. It was originally submitted on November 2, 2008, by Craig Swain of Leesburg, Virginia. This page has been viewed 727 times since then and 10 times this year. Photos:   1, 2, 3. submitted on November 2, 2008, by Craig Swain of Leesburg, Virginia.

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Jul. 29, 2021