The position is currently held by Preeyaporn Suwannakes (Thai: ปรีญาพร สุวรรณเกษ, RTGS: Priyaphon Suwanket).

[4] The PCD operates vehicle checkpoints targeting "black smoke" emissions.

[5][6] In 2021, approximately half of all vehicles stopped by PCD checkpoints exceeded legal exhaust limits.

On 1 February 2025, PCD Director-General Preeyaporn Suwannakes announced new measures targeting vehicles emitting black smoke in conjunction with the Traffic Police Division.

[3] Under the authority of Thailand's Traffic Act and the Environmental Protection Act of 1992, police can now order vehicle owners to rectify excess emissions within the 15-day period.