Baseline Scenario. The base air quality conditions where emissions are not adjusted or

controlled. The baseline scenario is usually considered to be the reference scenario against which

to compare a potential “control scenario”, in which emissions levels are changed from the

baseline levels through the application of various control measures.

Beta. The coefficient for the health impact function. The value of beta (ß) typically represents

the percent change in a given adverse health impact per unit of pollution.

Binning. The process of summarizing data by sorting the data values from low to high, dividing

the sorted data into a pre-determined number of groups, and then choosing a representative value

for each group, by either averaging the values in each group, or picking the mid-point of each


Closest Monitor. The procedure by which data from a nearest monitor are used to represent

air pollutant levels in a population grid cell. BenMAP can also scale the data from the nearest

monitor with air pollution modeling data. BenMAP includes two types of scaling – “temporal” and

“spatial”. See “Scaling” for additional explanation.

Community Multi-scale Air Quality (CMAQ) Model



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