Figure 1. Average 1-hour daily maximum ozone concentration in the OTAG region. All four corners of the region have about 30-40 ppb ozone concentration which corresponds to tropospheric background entering the region.
The OTAG region is ventilated typically by prevailing
winds coming from outside the domain. The air masses entering
the OTAG region originate in Canada in the North and Northeast,
from the Gulf of Mexico and Atlantic Ocean in the South, and from
the western United States to the Midwest. Ozone concentrations
in these air masses are about 30-40 ppb, which corresponds to
typical tropospheric background levels measured at remote sites
of the world. It is reasonable to assume that in the absence of
anthropogenic emissions, the average summertime ozone concentration
would be about 30-40 ppb throughout the OTAG domain.
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