The following examples illustrate how varying these options affects the final average concentration

estimate.

Example 1: Monitor Direct VNA method

Default options

Consider the following example at an hypothetical rural grid cell, where there are relatively few

monitors, and where the distance from a monitor to the grid cell can be fairly large. With VNA,

BenMAP first identifies the set of “neighbor” monitors for each grid cell. The number of

neighbors is usually in the range of about three to eight. In this case, assume that there are five

monitors at distances of 25, 50, 100, 200, and 400 miles from the grid cell, with annual PM2.5

levels of 8, 13, 12, 18, and 15 μg/m3, respectively. BenMAP would calculate an inversedistance

weighted average of the monitor values as follows:

Example 2: Monitor Direct VNA method

Maximum Neighbor Distance = 75

Using the same example that we used above, let us say you have specified a Maximum

Neighbor Distance of 75 miles, and left unchanged the default options (infinite value) for

Maximum Relative Neighbor Distance. BenMAP would only consider the first two

monitors, and would calculate an inverse-distance weighted average of the monitor values as

follows:

 

n301 - n302 - n303 - n304 - n305 - n306 - n307 - n308 - n309 - n310 - n311 - n312 - n313 - n314 - n315 - n316 - n317 - n318 - n319 - n320 - n321 - n322 - n323 - n324 - n325 - n326 - n327 - n328 - n329 - n330 - n331 - n332 - n333 - n334 - n335 - n336 - n337 - n338 - n339 - n340 - n341 - n342 - n343 - n344 - n345 - n346 - n347 - n348 - n349 - n350

 

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