<prompt> tafadhali geuza maudhui haya ya swahili kwenda kwa kiingereza.ulimwenguni, uchafuzi wa nje wa hewa unasababisha vifo vya 4.2 milioni katika 2016, na usafiri ni wajibu kwa idadi kubwa ya uchafuzi wa hewa katika miji kote duniani.  <response>: globally, outdoor air pollution caused 4.2 million deaths in 2016, and transport is responsible for a large proportion of air pollution in cities around the world. 