3.4.2 Implementation of Gradient adjusted Spatial Fields

Gradient adjusted spatial fields are first created for the base year. Future year estimates

can then be created by applying gridded RRFs to the gradient adjusted spatial fields. The basic

steps are as follows:

1) Interpolate base year ambient data to create a set of spatial fields.

2) Adjust the spatial fields using gridded model output gradients (base year values).

3) Apply gridded model RRFs to the gradient adjusted spatial fields.

4) Determine if any unmonitored areas are predicted to exceed the NAAQS in the future.

EPA has developed a software package called “Modeled Attainment Test Software”

(MATS) which will spatially interpolate data, adjust the spatial fields based on model output

gradients and multiply the fields by model calculated RRFs (steps 1-3 above) (ABT, 2007).

21The accuracy of interpolated fields can be tested by removing sets of monitors to see

how well the interpolation scheme estimates known concentrations at ambient monitoring sites.

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