Air quality data analysis system for interrelating effects, standards, and needed source reductions. Part 8. An effective mean O/sub 3/ crop reduction mathematical model
A plant injury mathematical model, applied previously to acute and chronic leaf injury data, is used here to model National Crop Loss Assessment Network (NCLAN) data for 15 cultivars and to calculate species parameters from the cultivar analyses. Percent crop yield reduction is estimated as a function of a new parameter, the effective mean O/sub 3/ concentration: m/sub e/ = ((..sigma.. c/sub h//sup -1/v/)/n)/sup -v/, where c/sub h/ is the hourly average ambient O/sub 3/ concentration for each daytime hour (defined here as 9:00 a.m.-4.00 p.m., always standard time) of data available at an air sampling site for summer (defined here as June 1-August 31), n is the total number of such available hours, and v is an exposure time-concentration parameter, calculated here to be approximately -0.376. Crop yield reductions for seven plant species are estimated with similar equations for each of the 1824 site-years of 1981-1983 hourly O/sub 3/ concentration data available in the National Aerometric Data Bank (NADB). County-average effective mean O/sub 3/ concentrations are indicated by shading on a US map. State-average O/sub 3/ parameters and estimated percent crop yield reductions are tabulated. The National Ambient Air Quality Standard (NAAQS) for O/sub 3/ specifies that, on the average, the second highest daily maximum 1-h average O/sub 3/ concentration in a year shall not exceed 0.12 ppm. For years 1981-1983, 71% of the NADB sites recorded annual second highest daily maximum 1-h average O/sub 3/ concentrations below 0.125 ppm (for summer daytime hours). Ambient O/sub 3/ concentrations reduced the total US crop yield an estimated 5% for years 1981-1983.
- Research Organization:
- Environmental Protection Agency, Research Triangle Park, NC
- OSTI ID:
- 6304655
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Vol. 34:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CROPS
INJURIES
PRODUCTIVITY
OZONE
ENVIRONMENTAL EFFECTS
AIR QUALITY
DATA ACQUISITION
DATA ANALYSIS
INVENTORIES
MATHEMATICAL MODELS
STANDARDS
THEORETICAL DATA
DATA
ENVIRONMENTAL QUALITY
INFORMATION
NUMERICAL DATA
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)