This is LEED reviewer question

The credit form indicates that the project is located in an area where the national standard or guideline for Particulate Matter smaller than 2.5 micrometers (PM2.5) is exceeded and itis not clear if the outdoor air is filtered consistent with Section 6.2.1.1 of ASHRAE 62.1-2010. 

In my project there is evaporative cooler only and no Air conditioning. So not possible for installing MERV Filters. 

In this scenerio what to do?