Contribution to pollution by different types of vehicles based on age and number. Pakistan Journal of Science, [S. l.], v. 76, n. 3, 2024. DOI: 10.57041/vol76iss3pp%p. Disponível em: https://paas-pk.org/index.php/pjs/article/view/1186. Acesso em: 1 nov. 2025.