Record Display for the EPA National Library Catalog

RECORD NUMBER: 32 OF 373

OLS Field Name OLS Field Data
Main Title Analysis of Crop Loss for Alternative Ozone Exposure Indices.
Author Tingey, D. T. ; Hogsett, W. E. ; Lee, E. H. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Northrop Services, Inc., Corvallis, OR.
Year Published 1988
Report Number EPA/600/D-88/118;
Stock Number PB88-214788
Additional Subjects Ozone ; Air pollution ; Farm crops ; Plant growth ; Mathematical models ; Exposure ; Concentration(Composition) ; Response ; Seasonal variations ; Plant physiology ; Air pollution effects(Plants)
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB88-214788 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 12/29/1988
Collation 15p
Abstract
Defining the appropriate exposure index that 'best' relates plant response to exposure necessitates a consideration of the underlying biological basis for the response and a method for characterizing the temporal variations in pollutant occurrence. Although no single index was deemed 'best' (in all cases) for relating O(3) exposure to plant response, the top-performing exposure indices were those that (1) cumulate the hourly O(3) concentrations over time, (2) emphasize concentrations of 0.06 ppm and higher either by continuous sigmoid weights or by discrete (0 or 1) weights of the threshold indices. The 'best' index gave greater weight to exposures occurring 20 to 40 days before harvest. When assessing the impact of O(3) on plant growth, these findings illustrate the importance of exposure duration, the importance of repeated peaks, and the time of increased plant sensitivity.