State and local air quality agencies are currently assembling information EQ Winter 2018 Triennial photothat will allow them to build their triennial minor source emission inventory for 2017. Agencies are required to report these inventories to U.S. EPA every three years. The data is used for multiple purposes, including evaluation of emission trends; development of regulatory and enforcement priorities; and, in some cases, modeling to compare to National Ambient Air Quality Standards, assess progress against Regional Haze goals, and look into potential air toxics impacts.

Agency approaches to developing these inventories vary and may include information requests to emission sources. Assumptions made in preparing these inventories can have far-reaching effects on industry. If you have questions about expectations for your facility, contact your permit authority or Trinity Consultants, Inc.