Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar wurin: Passage: Babban zirga-zirga da cunkoso a cikin manyan biranen birni suna ci gaba da haifar da matsaloli masu tsanani na muhalli da kiwon lafiya, koda kuwa matakan smog sun ragu sosai tun daga shekarun 1970 da 1980, kuma kasancewar smog yana zama abin da ya faru da ƙarancin yanayi kuma matakan sulfur dioxide suna raguwa. Tambaya: Menene ainihin dalilin matsalolin muhalli da kiwon lafiya a wannan yanayin?
Yawan zirga-zirga da cunkoso