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New particle formation and condensational growth in a large indoor space

机译：在较大的室内空间中形成新的粒子并凝结生长

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Several episodes of new particle formation followed by slow condensational growth were observed in a large construction hall during a routine measurement of air quality in May of 2007. Both nucleation and growth resembled those processes in the outside, open atmosphere. Appearance near midday, relative indoor humidity below 50% and outdoor ozone concentration above 100 ug m~-3 were characteristic for nucleation events. Condensational growth rates were about 2.6 nm h~-1 , close to those recorded at a rooftop station in an urban atmosphere in Prague. In the hall, the growths were frequently interrupted by the activity of personnel during work shifts. Outside of the work shifts, one case of undisturbed growth lasting for 18 h was recorded. Although the penetration of particles from outdoors is a possible explanation for the aerosol nucleation and growth, the low value of the air exchange rate (0.36 h"'), high number concentrations and long residence time of aerosol particles in a large hall allow us to hypothesize the whole process started and evolved indoors. This hypothesis has two important implications. New particle formation and growth can also be considered as a micro-scale phenomenon, and processes of atmospheric aerosol nucleation and growth can be studied under semi-experimental conditions in large indoor spaces.
机译：在2007年5月例行测量空气质量的过程中，在一个大型建筑大厅内观察到了几起新的颗粒形成过程，随后出现了缓慢的凝结生长。成核和生长过程都类似于在外部露天环境中的过程。中午出现，成核事件的特征是室内相对湿度低于50％，室外臭氧浓度高于100 ug m〜-3。凝结生长速率约为2.6 nm h〜-1，接近布拉格城市大气中屋顶站的记录。在大厅里，工作班次频繁地被人员活动打断。在工作班次之外，记录了1个持续18小时不受干扰的生长情况。尽管从室外进入的粒子可以解释气溶胶成核和生长的原因，但是空气交换速率的值低（0.36 h“'），气溶胶粒子在大型大厅中的高浓度和长停留时间使我们能够假设整个过程是在室内开始和演化的，这个假设有两个重要的含义：新的颗粒形成和生长也可以被视为微观现象，并且可以在半实验条件下研究大气气溶胶成核和生长的过程室内空间。

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