Concentration of ultrafine dust (UFP) in ambient air

Ultrafine dust (UFP) are particles with a diameter of less than 100 nm. The VMM measures UFP particles from 10 to 100 nm.About 90 % of the number of particles in the air are ultrafine dust particlesIn an urban environment, traffic is the main source of ultrafine dust, but also industry and households (building heating) contribute to UFP emissions By their very small size ultrafine dust can penetrate deeply into the lungs, enter the blood stream and cause harmful effects elsewhere in the body.超细粉尘（UFP）是直径小于100纳米的颗粒物。VMM可检测粒径处于10至100纳米区间的UFP颗粒物。空气中约90%的颗粒物数量为超细粉尘颗粒物。在城市环境中，交通是超细粉尘的主要排放源，工业与民用领域（如建筑供暖）同样会贡献UFP排放。由于粒径极小，超细粉尘可深入肺部，进入血液循环系统，并对人体其他部位造成有害影响。