coal dust

详细解释:【机】 煤粉, 煤尘

例句：

The modern city consists of monstrous edifices and of dark narrow streets full of petrol fumes, coal dust, and toxic gases.现代城市是由大得怕人的大厦和充斥着难闻的汽油味，煤灰和有毒气体和又阴暗又狭窄的街道所组成。