National Technical Reports Library - NTRL

National Technical Reports Library


Details
Actions:
Download PDFDownload XML
Download

Adusting for the Effect of Environmental Variability in Outdoor Engineering Control Studies; Detailed Derivations.


PB2004104099

Publication Date 2003
Page Count 26
Abstract In outdoor engineering control studies, measured analytic concentration levels change as environmental conditions change. Since the effectiveness of an engineering control varies with environmental conditions, comparisons of measurements taken with engineering controls operating versus those taken in an uncontrolled environment should adjust for these changes. However, environmental parameters are difficult to estimate. In this work, models based on factor analysis are used to account for the effect of environmental variables. These models also describe the phenomenon that greater control efficiency tends to occur at the highest levels of the uncontrolled environment. The approach is combined with the randomized pair (uncontrolled environment determination, engineering control determination) approach that is often used in these studies. Also investigated are the benefits of taking samples at different locations and of different analytes.
Keywords
  • Engineering controls
  • Environmental variations
  • Randomized pairs
  • Models
  • Outdoors
  • Derivations
  • Analyte concentrations
  • Environmental conditions
  • Changes
  • Comparisons
  • Measurements
  • Factor analysis
  • Uncontrolled environments
Source Agency
  • National Institute for Occupational Safety and Health
Corporate Authors National Inst. for Occupational Safety and Health, Washington, DC.
Document Type Technical Report
NTIS Issue Number 200414
Adusting for the Effect of Environmental Variability in Outdoor Engineering Control Studies; Detailed Derivations.
Adusting for the Effect of Environmental Variability in Outdoor Engineering Control Studies; Detailed Derivations.
PB2004104099

  • Engineering controls
  • Environmental variations
  • Randomized pairs
  • Models
  • Outdoors
  • Derivations
  • Analyte concentrations
  • Environmental conditions
  • Changes
  • Comparisons
  • Measurements
  • Factor analysis
  • Uncontrolled environments
  • National Institute for Occupational Safety and Health
Loading