Visibility impairment means any humanly perceptible change in visual range, contrast, or coloration from that which would have existed under natural visibility conditions.
Visibility impairment means any humanly perceptible change in visual range, contrast or coloration from that which existed under natural conditions. Natural conditions include fog, clouds, windblown dust, rain, sand, naturally ignited wildfires, and natural aerosols.
Visibility impairment means any humanly perceptible change in visibility (light extinction, visual range, contrast, coloration) from that which would have existed under natural conditions.
Examples of Visibility impairment in a sentence
Visibility impairment reduces the clarity, color, and visible distance that one can see.
Visibility impairment reduces the clarity, color, and visible distance that can be seen.
No Federal Standards Visibility impairment on days when relative humidity is less than 70 percent.Source: http://www.arb.ca.gov/research/aaqs/aaqs2.pdf .
Visibility impairment that is caused by the emission of air pollutants from numerous sources located over a wide geographic area.
Visibility impairment is caused by light scattering and light absorption associated with particles and gases in the atmosphere.
More Definitions of Visibility impairment
Visibility impairment means any humanly perceptible change in visibility (light extinction, visual range, contrast, or coloration) from that which would have existed under natural condi- tions.
Visibility impairment means any humanly per- ceptible change in visibility (light extinction, visual range, contrast, or coloration) from that which would have existed under natural conditions.
Visibility impairment means any perceptible degradation in visibility (visual range, contrast, coloration) not caused by natural conditions.
Visibility impairment means any humanly perceptible reduction in visibility (light extinction, visual range, contrast, and coloration) from that which would have existed under natural conditions.
Visibility impairment means any humanly perceptible change in visibility (light extinction, visual range, contrast, or colora- tion) from that which would have existed under natural conditions.
Visibility impairment means any humanly perceptible change in visibility, perceived as light extinction, visual range, contrast or coloration, from that which would have existed under natural conditions. Natural conditions include naturally occurring phenomena that reduce visibility as measured in terms of light extinction, visual range, contrast, or coloration.
Visibility impairment means visibility impairment that is caused by the emission of air pollutants from one source or a small number of sources, 40 C.F.R. §§ 51.302-51.306.