The domain’s width was given to be moderately large,
covering at least 80% of the full paths from both episodes and
accounting for such local recirculation to a certain degree. It is
noted that other elevated-O3 days in 2006 were also considered at
the beginning of the study. However, some do not share the desired
characteristics already described, while some do not have the
observed air quality/meteorological data as much available over
daytime hours as the selected days do.