Word污染wūrǎnMeaningpollutionPart of speechnounPronunciationCourseHardcore ChineseLessonLesson 23Usages of wūrǎn现在xiànzài 很多hěnduō 城市chéngshì 的de 空气kōngqì 污染wūrǎn 很hěn 严重yánzhòng。xiànzài hěnduō chéngshì de kōngqì wūrǎn hěn yánzhòng.Nowadays, air pollution in many cities is very serious.