All cars emit exhaust fumes, but some cars are worse than others.Old cars actually poison the environment and human health.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/toxic-trade-old-cars-poisoning-kampala-city
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-vision-uganda
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uganda
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa