Figure 4.1 shows an example of the raw data from the analysis for all of the monitoring
sites in the Baltimore region. The plot shows the daily RRFs vs. the base case daily maximum
modeled concentrations for all days (above 60 ppb in this case). In this example, it can be seen
that the model tends to respond more to emissions reductions (lower RRFs) at higher predicted
ozone concentrations. There appears to be a general pattern in the model results such that the
model predicts less benefit from emissions reductions at lower concentrations. The greater
model response at higher concentrations is likely due to more “controllable ozone” at higher
concentrations. On days with high ozone concentrations, there is a relatively high percentage of
locally and/or regionally generated ozone compared to days with low basecase concentrations.
Days with low concentrations likely have a high percentage of ozone due to background and
boundary conditions (background ozone is uncontrollable, although boundary conditions may be
controllable, depending on the size of the domain.) Since we are generally interested in the
model response on high ozone days, these results tend to suggest that the RRF calculation should
be limited to days when the model predicts high ozone concentrations.
29See http://www.epa.gov/cair/pdfs/finaltech02.pdf for documentation of the base case
and future year modeling.
n601 - n602 - n603 - n604 - n605 - n606 - n607 - n608 - n609 - n610 - n611 - n612 - n613 - n614 - n615 - n616 - n617 - n618 - n619 - n620 - n621 - n622 - n623 - n624 - n625 - n626 - n627 - n628 - n629 - n630 - n631 - n632 - n633 - n634 - n635 - n636 - n637 - n638 - n639 - n640 - n641 - n642 - n643 - n644 - n645 - n646 - n647 - n648 - n649 - n650
castellano: DISPER CUSTIC DESCAR RADIA italiano:
deutsch: DIS CUS DES RAD
castellano: DIS CUS DES RAD english: DIS CUS DES RAD
português: DIS CUS DES RAD italiano: DIS CUS DES RAD
français: DIS CUS DES RAD