CFR §170.305: The "Application Exclusion Zone" or AEZ is a new term used in the WPS
refers to the area surrounding the pesticide application equipment that must be
free of all persons other than appropriately trained and equipped handlers
during pesticide applications.
More detailed information is available here.
The following animations were approved by the US EPA, and demonstrate
how the AEZ moves with the application equipment. For more information,
see the Worker Protection Standard Application Exclusion Zone Requirements: Question and Answer Fact Sheet (PDF)