How many days in advance must the EPA and applicable state or local air pollution control agency be notified before a scheduled date of RATA?

The requirement for notifying the EPA and the applicable state or local air pollution control agency about a scheduled Relative Accuracy Test Audit (RATA) is set at a minimum of 21 days in advance. This timeframe ensures that these agencies have adequate opportunity to prepare for the audit and make any necessary arrangements for oversight. The 21-day notice requirement aligns with regulatory guidelines established to maintain transparency and coordination between facilities and regulatory bodies, promoting effective compliance with air quality standards.