Desert dust and particulate matter in the city had been known to force the pollution index into warning territory, above 300, which means people should stay indoors.
Desert dust and particulate matter in the city had been known to force the pollution index into warning territory, above 300, which means people should stay indoors.
这座城市的沙尘和微粒污染指数达到300以上，这意味着人们必须待在家里。