Non-Uniform VisibilityA localized visibility which varies from that reported in the body of the report.Prevailing VisibilityThe visibility that is considered representative of conditions at the station; the greatest distance that can be seen throughout at least half the horizon circle, not necessarily continuous.Sector VisibilityThe visibility in a specific direction that represents at least a 45º arc of a horizontal circle.VisibilityThe distance at which a given standard object can be seen and identified with the unaided eyeVisibility Protection ProgramThe program specified by the Clean Air Act to achieve a national goal of remedying existing impairments to visibility and preventing future visibility impairment throughout the United States.
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