Welcome to the Delaware Division of Air Quality’s (DAQ) Air Emission Inventory system. The State and Local Emissions Inventory System (SLEIS) is designed to facilitate the collection and reporting of air emissions inventory information. Your feedback regarding SLEIS is encouraged. To make an inquiry or suggestion, please click the “Submit general questions and/or comments” link below. Be sure in include your name and contact information in your message.

Guidance Documents:

SLEIS Walkthrough Guide
SLEIS Method Code 28 Emission Factors
Operation Data Fact Sheet
SLEIS v1.6 Fact Sheet
2016 Active Reporting Code Tables

Submit general questions and/or comments


To register as a SLEIS user, please fill out the registration form below. Return completed forms to DAQ staff as instructed on the registration form. DAQ staff will complete the registration process to allow access into SLEIS.

Download registration forms