Ucwaningo olusha lwembula ukuthi ukungcola okuvela emisebenzini yabantu kuthinta kanjani ikhono labo lokuthola izimbali Kunoma yimuphi umgwaqo omatasa, izinsalela zomsi wemoto zilenga emoyeni, phakathi kwazo kukhona ama-nitrogen oxides kanye ne-ozone. Lokhu kungcola, okukhishwa futhi yizikhungo eziningi zezimboni kanye nezitshalo zikagesi, kuyantanta...
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