Filtration systems in large commercial environments are often treated as “set-and-forget,” initially installed and configured for certain performance standards but then never monitored for continuing adherence to those standards. In order to understand how the performance of these filtration systems degrades over time, and how to mitigate and restore performance, it is essential to understand air flow patterns between different spaces, the presence of different types and sizes of particulate matter, and other indicators. These indicators can then ensure that you make the HVAC and filtration system modifications needed (such as filter replacements, increased or decreased airflow, change in vent placements, the location of purifiers, and so on) to ensure optimal air quality standards for your spaces.