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Preliminary Nonroad Landbased Diesel Engine Rule: Air Quality Estimation, Selected Health And Welfare Benefits Methods, And Benefit Analysis Results.

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This document is a benefits analysis to determine the changes in human health and welfare, both in terms of physical effects and monetary value, that result from the projected changes in ambient concentrations of various pollutants for the modeled standards. This document details the steps we use to estimate health and welfare benefits, such as, reductions in premature mortality, visibility improvement, reduction in crop losses, and reduction in household soiling. The approaches to each of these benefits estimates can differ in detail, such as for visibility, as we describe later in this document, but the general approach is as follows:
- We combined the results of sophisticated photochemical air quality models with air quality monitoring data, to estimate baseline and post-control ambient concentrations of ozone and PM.
- We calculated the change between baseline and post-control estimates, and then combined this change with population forecasts, to give the change in population-level exposures due to the preliminary policy.
- We used the changed in population exposure as an input to concentration-response functions, which allowed us to estimate the associated change in the incidence of health and welfare effects for each individual concentration-response function.
- Where multiple C-R functions are available for an endpoint, we pooled the estimated change in incidence using fixed or random effects pooling methods.
- We then assigned monetary values to the changes in health and welfare effects, taking into account adjustments to values for growth in real income out to the year of analysis. Finally, we summed these monetary values to obtain an estimate of total monetary value of the changes in emissions.

Reference #:
EPA Office:
Office of Air and Radiation
Office Suboffice:
Office of Air Quality Planning and Standards
Office Division:
No division specified
EPA Author:
Hubbell, Bryan; Fox, Tyler
Document Type:
Benefit Analysis
Abt Associates, Inc.
Document Status:
Not Reported

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