降尘，又称“落尘”，是指自然降落于地面的空气颗粒物，其粒径多在10微米以上，计量指标单位为一定时间内单位面积上地表沉降物质的量。大气粉尘自然沉降量的监测是开展较早的大气污染物例行监测项目。
... reservation in law 法律保留 lowering dust 降尘 unfulfilled grain percentage 秕粒率 ...
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灰尘 dirt; dust 降尘 dust fall; particulate matter; fallout (volcanic, nuclear etc) 看破红尘 to reject the world for a monastic life; disillusioned with human society ..
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To compare with the usual dustfall, the dust in the thesis is named as air dust near the ground.
相对于通常所说的降尘，这种大气尘称之为近地表大气尘。
参考来源 - 成都市近地表大气尘的环境地球化学特征The contents of heavy metal in drop dust do not vary significantly with increasing altitude.
降尘中重金属元素含量随高度没有显著变化规律。
参考来源 - 开封市近地层大气颗粒物垂直分布特征研究According to the dust-settling principle,and on the basis of analyzing the dust removal efficiency influence factors, an ideal nozzle structure used in dust reduction system was designed.
依据降尘机理,在分析了影响喷雾降尘效率主要因素的基础上,提出了一种较理想的降尘系统的喷嘴结构。
参考来源 - 新型聚甲醛喷嘴在煤矿降尘中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
大气降尘中所含的镉和铅都对环境和人体健康造成危害。
Cadmium and Lead in dustfall is harmful to environment and human health.
英国已经发现从日本受损的福岛核电站释放出来的放射性降尘。
RADIOACTIVE fallout from the stricken Fukushima nuclear plant in Japan has been found in the UK.
防风效能、乱流交换强度、土壤湿度是决定降尘量大小的主要因子。
Wind-protection effect, turbulivity and soil moisture are the main factor which determine the falling dust capacity.
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