Guidance on the Preparation of Exceptional Events Demonstrations for Stratospheric Ozone Intrusions

This document is intended to assist air agencies in preparing demonstrations for stratospheric ozone intrusions that meet the requirements of the Exceptional Events Rule. 

• Guidance on the Preparation of Exceptional Events Demonstrations for Stratospheric Ozone Intrusions (pdf) (2.34 MB, November 2018, EPA-457/B-18-001)