40 CFR § 63.8545
When do I have to comply with this subpart?
June 9, 2020
(a) You must comply with this subpart no later than the compliance dates in Table 8 to this subpart.
(b) You must meet the notification requirements in §63.8630 according to the schedule in §63.8630 and in subpart A of this part. Some of the notifications must be submitted before you are required to comply with the emission limitations in this subpart.