Under Section 89 of the Road Transport Act 2018, driving a motor vehicle that emits black smoke exceeding prescribed environmental limits is punishable by:

1. A fine of BDT 500
2. Imprisonment of up to 3 months, a fine of up to BDT 25,000, or both
3. A fine of BDT 50,000 and vehicle confiscation
4. A mandatory 2-year suspension of your driving licence