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Light Scattering

View of the nephelometer, a gray machine with wires and a white cylinder, from below.

This instrument, called a nephelometer, measures light scattering in real-time. These data provide a precise measurement of how air pollution affects what you can see every minute of the day! The National Park Service uses this information to help make decisions about how to preserve the beautiful views in parks. Similar instruments are used at airports to ensure that pilots can fly safely. The visibility distances (visual ranges) shown on the Shenandoah National Park webcam webpage and live data webpage are calculated using nephelometer data.

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Mary O'Neill

Public domain:Full Granting Rights

Image

Shenandoah National Park, Code: SHEN

Shenandoah National Park, Virginia
Latitude: 38.3517684936523, Longitude: -78.5008163452148

NPS.gov Collection

07/31/2018

07/31/2018

Public Can View

Mary O'Neill

Mary O'Neill

Tuesday, February 26, 2019 8:41:40 AM

Tuesday, February 26, 2019 8:41:40 AM

Nephelometer.jpg

Canon Canon, Canon EOS 5DS R 800, EF24-105mm f/4L IS USM

1/2500 sec at f / 7.1

35 mm

ISO 800

Tuesday, July 31, 2018 4:53:06 PM

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501.7 kB

Scenic