Based on spatial pattern, temporal pattern, and transport considerations, some general control approaches appear to have higher leverage. Geographically, the region located in the center of the OTAG domain tends to impact on downwind areas regardless of which direction the wind blows. In addition, trajectory residence-time analyses implicate the central portion of the OTAG domain as being involved in transport-related ozone events more than any other portion of the domain, so controls implemented in this area may be effective at reducing transport more often than controls anywhere else. Further, given the density of NOx-rich point sources in this portion of the domain and the observation that ozone formation appears to be NOx-limited in non-urban areas, it follows that NOx controls may be more effective in this regard. It should be noted that this suggestion is consistent with all regional modeling results to date.
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