Notice of Exceptional Event Demonstration

Division of Air Quality

Published: March 31, 2024
Comments Due: April 30, 2024

DNREC Notice No. AQ20240114
Non-Discrimination Policy

The Department of Natural Resources and Environmental Control (DNREC), Division of Air Quality (AQ) is providing the public an opportunity to inspect and comment on an exceptional event demonstration prior to submission of the final demonstration to the United States Environmental Protection Agency (EPA). This demonstration is being submitted in accordance with 40 CFR 50.14. It requests that EPA concur that ozone data at Delaware’s Lums Monitor on June 2, 2023 was influenced by the presence of wildfire smoke and will not be used for regulatory determinations.

The exceptional event demonstration may be inspected online starting March 31, 2024 at, by contacting our New Castle office by phone at 302-323-4542 or by email at

The Department will accept public comment through the close of business on Tuesday, April 30, 2024. Comments will be accepted in written form via email to or by U.S. mail to the following address:

Attn: Angela Marconi
DNREC – Air Quality
100 W. Water Street, Suite 6A, Dover, DE 19904