防尘口罩，是从事和接触粉尘的作业人员必不可少的防护用品。主要用于含有低浓度有害气体和蒸气的作业环境以及会产生粉尘的作业环境。滤毒盒内仅装吸附剂或吸着剂。有的滤毒盒还装有过滤层，可同时防气溶胶。有些军用防毒口罩，主要由活性炭布制成，或者用抗水抗油织物为外层，玻璃纤维过滤材料为内层，浸活性炭的聚氨酯泡沫塑料为底层，可在遭受毒气突然袭击时提供暂时性防护。
工人佩戴防尘口罩。
它们比标准的外科口罩或有时建筑工人使用的防尘口罩要有效得多。
They are much more effective than the standard surgical masks or dust masks that are sometimes used by builders.
近几日北京持续被浓重雾霾笼罩，市场上防尘口罩和空气净化器的销量剧增。
Thee market for dust masks and air purifiers is booming in Beijing because the capital has been shrouded for several days in thick fog and haze.
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