低能见度:low visibility

　　危险级:hazardous level

　　晨雾:morning haze

　　烟雾:smog

　　尘埃:dust particle

　　污染物:pollutant

　　笼罩:shroud

　　口罩:gauze mask

　　高速路关闭:expressway closed

　　交通阻塞:congestion

　　车辆首尾相连:bumper-to-bumper

　　连环撞:pile-up