4.0 Ozone Attainment Test
Section 3 contained the details of the modeled attainment test that are common to both
ozone and PM2.5. This section describes several additional details related to the 8-hour ozone
attainment test. The section concludes with an example calculation.
4.1 Limiting modeled 8-hour daily maxima chosen to calculate RRF.
On any given modeled day, meteorological conditions may not be similar to those
leading to high concentrations (i.e., values near the site-specific design value) at a particular
monitor. If ozone predicted near a monitor on a particular day is much less than the design
value, the model predictions for that day could be unresponsive to controls (e.g., the location
could be upwind from most of the emissions in the nonattainment area on that day). Using
equation (3.1) could then lead to an erroneously high projection of the future design value.
In order to examine this issue, we analyzed modeled baseline and future emissions for 30
episode days during 1995 using a grid with 12 km x 12 km cells and 9 vertical layers29. We
examined modeled RRF’s computed near each of 299 monitoring sites in the eastern half of the
United States (Timin, 2005b). The study examined the day to day variability of (daily) RRFs at
each site. One purpose of the study was to assess the extent to which a relative response factor
(RRF) is dependent on the magnitude of modeled current 8-hour daily maxima.
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castellano: DIS CUS DES RAD english: DIS CUS DES RAD
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