Air Pollution Control Program

Screen Modeling versus Refined Modeling

Simple screening procedures can be used to determine if a proposed source or modification poses a threat to the air quality within a region.  If the screening analysis indicates that no threat to air quality is likely due to the construction of an emissions source; no further analysis is necessary and the compliance determination can be deemed complete.  If, on the other hand, the screening results indicate potential adverse impacts, a refined air quality analysis will be required. 

It should be noted that if the following criteria are met, a screening analysis is not appropriate and should not be conducted:  the source configuration is complex; the emission rates are variable; multiple emission releases are under review; complex topographical features are present; or the existing air quality within the region is questionable.  In these instances, a refined air quality analysis will be required.