Document Detail


Fugitive emissions opacity determination using the digital opacity compliance system (DOCS).
MedLine Citation:
PMID:  18069455     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Maintenance of Department of Defense (DoD) weapon systems, conducting battlefield training exercises as well as meeting military construction and/or demolition schedules, invariably generate fugitive air emissions, many of which are visible. Although there is no codified federal method for quantifying fugitive emissions opacity, many state and local air regulatory agencies have instituted enforceable fugitive emission opacity standards at DoD facilities. The current study focused on comparing the performance of the digital opacity compliance system (DOCS) with U.S. Environment Protection Agency Method 9 (Method 9) certified human observers in quantifying the visible opacity associated with fugitive emissions produced using a commercial fog generator. By systematically repositioning both DOCS cameras and Method 9-certified observers during field testing, differences in method performance as a function of observational locations were documented. At both the 30- and 300-ft off-set distances, opacity levels reported by the DOCS technology and Method 9-certified smoke readers were found to be statistically different at the 99% confidence level. Alternatively, at the 90- and 150-ft off-set distances, results suggested that there was an insignificant difference at the 99% confidence level between the two methods. Comparing the magnitude of the each method's standard deviation suggested that, at the 30-ft off-set distance, the DOCS technology was consistently more precise than Method 9-certified readers regardless of the observer's downwind distance. However, at the 90, 150, and 300-ft off-set distances, method precision seemed to vary as a function of both off-set and downwind distance. The primary factor affecting the consistency in opacity measurements appeared to be the impact of ground-level air turbulence on fog plume dispersion and transport. Field observations demonstrated that localized wind shear played a critical and decisive role in how and to what extent fugitive emissions opacity could be determined, regardless of the method selected.
Authors:
Michael J McFarland; Arthur C Olivas; Sally G Atkins; Robert L Kennedy; Kalpesh Patel
Related Documents :
9112815 - Aspects of human biometeorology in past, present and future.
23800765 - Vision and quality of life index: validation of the indian version using rasch analysis.
11032145 - On artificial dilution of point source mercury emissions in a regional atmospheric model
19822555 - Air quality warnings and outdoor activities: evidence from southern california using a ...
7398715 - Measures of attitudes toward the elderly: a statistical re-evaluation of comparability.
11710765 - Why are arthropods segmented?
Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of the Air & Waste Management Association (1995)     Volume:  57     ISSN:  1096-2247     ISO Abbreviation:  J Air Waste Manag Assoc     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-12-11     Completed Date:  2008-01-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9503111     Medline TA:  J Air Waste Manag Assoc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1317-25     Citation Subset:  IM    
Affiliation:
Department of Civil and Environmental Engineering, Utah State University, Logan, UT 84321, USA. farlandm@msn.com
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*,  chemistry
Air Pollution / legislation & jurisprudence
Environmental Monitoring / methods*
Humans
United States
United States Environmental Protection Agency
Chemical
Reg. No./Substance:
0/Air Pollutants

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Compilation and assessment of recent positive matrix factorization and UNMIX receptor model studies ...
Next Document:  Revised algorithm for estimating light extinction from IMPROVE particle speciation data.