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Standards Development
The Technical Specification specifies a process for the electrical diffusion charging of aerosols with subsequent measurement of particle charge. With the aid of this method, it is possible to determine the lung-deposited surface area (LDSA) concentration of particles in ambient air. Depending on the design of the electrical diffusion charger, the LDSA of particles in the size range of approximately 20 nm to approximately 400 nm is measurable. Furthermore, this document specifies design for LDSA measuring aerosol monitors as well as performance criteria and the associated test procedures. Instruments based on this measurement principle can be designed very compact with a low power consumption. This makes them ideally suited for handheld measurements, other forms of mobile application or to measure personal exposure. On the other hand, they can be easily adapted to serve as a stationary instrument in air quality monitoring stations.
There is growing recognition of the importance of aerosol particles with diameters D < 1 μm for human health as well as for their effects on climate. While usually the mass concentration of airborne particles is quantified both in the environment and at the workplace, various studies have shown the relevance of the number and surface area concentration. Some studies show correlations between the incidence of respiratory diseases and the number concentrations of airborne particles, others show that the effects on health due to inhaled particles correlate better with the particle surface area dose than with the particle mass dose. To describe the air quality in terms of dust load, it therefore appears advisable to supplement the parameters of mass concentration (for PM10 and PM2,5 (see EN 12341)), particle number concentration (see CEN/TS 16976) and number size distribution (CEN/TS 17434) with measurements of the particle surface area concentration (LDSA = lung deposited surface area) as a health-relevant metric.
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