Article citationsMore>>

US Environmental Protection Agency, “Guidance for Estimating Natural Visibility Conditions under the Regional Haze Program,” EPA-444/B-03-005, September 2003.

has been cited by the following article:

• TITLE: Site Specific Uncertainty in Regional Haze RuleHaze Indexes

  AUTHORS: Patrick A. Ryan

  KEYWORDS: Haze

  JOURNAL NAME: Atmospheric and Climate Sciences, Vol.2 No.1, January 19, 2012

  ABSTRACT: In 1999, the US Environmental Protection Agency (EPA) published the regional haze rule (RHR). The RHR default implementation plan calls for each class I area 20% worst baseline (2000-2004) visibility to improve linearly in time to natural conditions in 2064 and in calendar year 2018, each class I area 20% worst visibility is to comply with the 2018 visibility that falls on the linear improvement glide path from baseline (2000-2004) to natural (2064) conditions. This study shows that accurately assessing compliance depends on assessing the uncertainty in baseline, natural and 2018 visibility estimates. This study identifies ±3 dV and ±4 dV of uncertainty in 20% worst natural and baseline visibility estimates. The percent uncertainty in calculated 2018 glide path visibility values ranges from 10% - 45%.