In this episode, we continue the conversation related to fine particulate (PM2.5) current events and strategies to plan ahead for important permitting projects. We address how ambient monitoring for PM2.5 could fit into the planning process for upcoming projects. We also cover the possibility of innovative permitting approaches such as plantwide applicability limit (PAL) permits and the role that they could plan in the planning process. We close the conversation by addressing U.S. EPA’s draft guidance on precursor pollutant modeling for PSD permitting requirements and the implications of the guidance moving forward.