Literature study: potential of additional technology on conventional motorcycles on reducing the impact of exhaust gas emissions on the environment. JMEL : Journal of Mechanical Engineering Learning, [S. l.], v. 13, n. 2, p. 31–36, 2025. DOI: 10.15294/jmel.v13.i2.7357. Disponível em: https://journal.unnes.ac.id/journals/jmel/article/view/7357. Acesso em: 5 dec. 2025.