§ 63.8685 What are my general requirements for complying with this subpart?

(a) Before September 9, 2020, you must be in compliance with the emission limitations (including operating limits) in this subpart at all times, except during periods of startup, shutdown, and malfunction. On and after September 9, 2020, you must be in compliance with the emission limitations (including operating limits) in this subpart at all times, except during periods of nonoperation of the affected source (or specific portion thereof) resulting in cessation of the emissions to which this subpart applies.