| Main Title |
Co-Occurrence Patterns of Gaseous Air Pollutant Pairs at Different Minimum Concentrations in the United States (Journal Version). |
| Author |
Lefohn, A. S. ;
Davis, C. E. ;
Jones, C. K. ;
Tingey, D. T. ;
Hogsett, W. E. ;
|
| CORP Author |
A.S.L. and Associates, Helena, MT.;Corvallis Environmental Research Lab., OR. |
| Publisher |
c1987 |
| Year Published |
1987 |
| Report Number |
EPA-68-03-3225; EPA/600/J-87/466; |
| Stock Number |
PB89-144414 |
| Additional Subjects |
Sulfur dioxide ;
Ozone ;
Nitrogen dioxide ;
Air pollution ;
Concentration(Composition) ;
Sites ;
Rural areas ;
Air quality ;
Farm crops ;
Mixtures ;
United States ;
Graphs(Charts) ;
Reprints ;
Air pollution sampling ;
Air pollution effects(Plants)
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB89-144414 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
12p |
| Abstract |
The frequency of co-occurrences for SO2/NO2, SO2/O3 and O3/NO2 at rural and remote monitoring sites in the United States was characterized for the months of May-September for the years 1978-1982. Minimum hourly concentrations of 0.03 and 0.05 ppm of each gas were used as the criteria for defining a 'co-occurrence.' The objectives of the study were to: (1) identify the types of co-occurrence patterns and their frequency; (2) identify whether the frequency of hourly simultaneous co-occurrences increased substantially when the minimum concentration was lowered (e.g., from 0.05 to 0.03 ppm) for each pollutant; and (3) determine whether the frequency of co-occurrences showed large year-to-year variation. Based on their observations, researchers attempting to assess the potential effects of SO2/NO2, SO2/O3 and O3/NO2 in the United States should construct simulated exposure regimes so that (1) hourly simultaneous and daily simultaneous-only co-occurrences are fairly rare and (2) when co-occurrences are present, complex-sequential and sequential-only co-occurrence patterns predominate. (Copyright (c) 1987 Pergamon Journals Ltd.) |
