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Site Specific Uncertainty in Regional Haze RuleHaze Indexes

DOI: 10.4236/acs.2012.21001    5,938 Downloads   8,948 Views   Citations
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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%.


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The authors declare no conflicts of interest.

Cite this paper

P. Ryan, "Site Specific Uncertainty in Regional Haze RuleHaze Indexes," Atmospheric and Climate Sciences, Vol. 2 No. 1, 2012, pp. 1-7. doi: 10.4236/acs.2012.21001.


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