CBAM 2026 enters the charging phase covering six sectors with free allowances to zero by 2034; petrochem is not listed yet, but batch-level PCF with SHA-256 verifiable carbon data is already a buyer pre-clearance.

The CBAM definitive period starts in 2026 with free allocation phased to zero by 2034, covering six sectors first. Petchem is not in the first batch, but a PCF pre-condition demands verifiable batch-level carbon data, making cross-chain receipt mutual recognition and SHA-256 proof the compliance base.