Dimitra Karali, Glykeria Loupa  , Spyridon Rapsomanikis 

Laboratory of Atmospheric Pollution and Pollution Control Engineering of Atmospheric Pollutants, Department of Environmental Engineering, Faculty of Engineering, Democritus University of Thrace, 67100 Xanthi, Greece


Received: April 20, 2020
Revised: October 2, 2020
Accepted: November 3, 2020

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.2020.04.0159  

Cite this article:

Karali, D., Loupa, G., and Rapsomanikis, S. (2020). Nephelometer Sensitivities for the Determination of PM2.5 Mass Concentration in Ambient and Indoor Air. Aerosol Air Qual. Res. https://doi.org/10.4209/aaqr.2020.04.0159


  • On line PM2.5 mass concentration monitoring with nephelometry.
  • Light scattering coefficient dependence on relative humidity.
  • Indoor aerosol mass concentrations and densities.


Simple algorithms are presented for the relationships between the gravimetrically measured PM2.5 mass concentration and a nephelometer particle scattering coefficient, for three different environments: two outdoor locations (an urban and a suburban) and one indoors. With these algorithms, the aerosol light scattering coefficients of the nephelometer (provided on line with a time step of seconds) can be related to PM2.5 mass concentrations. The effect of the relative humidity on the nephelometer readings was also evaluated with two models. In the last two campaigns (in the suburbs of the city and in a laboratory), a drying device before the aerosol entrance to the nephelometer was used, a Nafion™ dryer. In the indoor environment, the two methods (the gravimetric and the nephelometry) were compared with the readings of an aerosol light scattering spectrometer, which provide PM2.5 volume concentrations and thus it was possible to calculate the PM2.5 density indoors.

Keywords: PM2.5 gravimetric mass concentrations; Aerosol light scattering coefficient; Nephelometric measurements; Indoor aerosol density.

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