exceptional event
Defined in 1 dictionary — U.S. Code
United States Code
42 U.S.C. § 7619 — in this section
The term “exceptional event” means an event that—
(i) affects air quality;
(ii) is not reasonably controllable or preventable;
(iii) is an event caused by human activity that is unlikely to recur at a particular location or a natural event; and
(iv) is determined by the Administrator through the process established in the regulations promulgated under paragraph (2) to be an exceptional event.