Ozone Monitor Filter
The ozone specific options differ from PM10 and PM2.5 in large part because ozone is an hourly
pollutant. TheNumber of Valid Hours specifies the number of hours needed for a particular
day of monitor to be considered "valid." BenMAP counts the number of non-missing hourly
values from theStart Hour through the End Hour and compare this number with that specified
in theNumber of Valid Hours.
ThePercent of Valid Days specifies the percent of days between the Start Date and the End
Datethat need to be valid for the monitor itself to be considered valid. The default is 50 percent
of the days between May 1 and September 30.
5.3Monitor and Model Relative
TheMonitor and Model Relative option lets you scale interpolated monitor values with model
data. As with theMonitor Direct option, you can choose Closest Monitor or Voronoi
Neighbor Averaging (VNA). In addition, you can scale the monitor values with three different
approaches:Spatial Only, Temporal Only, and Spatial and Temporal. As discussed below,
these approaches let you combine the advantage of the actual monitor observations with the
information provided by the models.
Monitor and Model Relativeair quality grid creation is exactly the same as Monitor Direct air
quality grid creation with the exception of scaling. The concept of scaling is to use modeling data
to improve interpolation and/or forecast future air quality trends.
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