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Open AccessArticle

Sensitivity Analysis for Predicting Sub-Micron Aerosol Concentrations Based on Meteorological Parameters

1
Institute for Atmospheric and Earth System Research (INAR)/Physics, University of Helsinki, FI-00560 Helsinki, Finland
2
Department of Computer Science, The University of Jordan, Amman 11942, Jordan
3
Department of Physics, The University of Jordan, Amman 11942, Jordan
*
Authors to whom correspondence should be addressed.
Sensors 2020, 20(10), 2876; https://doi.org/10.3390/s20102876
Received: 24 April 2020 / Revised: 12 May 2020 / Accepted: 15 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Sensors for Particulate Matter and Air Pollution)
Sub-micron aerosols are a vital air pollutant to be measured because they pose health effects. These particles are quantified as particle number concentration (PN). However, PN measurements are not always available in air quality measurement stations, leading to data scarcity. In order to compensate this, PN modeling needs to be developed. This paper presents a PN modeling framework using sensitivity analysis tested on a one year aerosol measurement campaign conducted in Amman, Jordan. The method prepares a set of different combinations of all measured meteorological parameters to be descriptors of PN concentration. In this case, we resort to artificial neural networks in the forms of a feed-forward neural network (FFNN) and a time-delay neural network (TDNN) as modeling tools, and then, we attempt to find the best descriptors using all these combinations as model inputs. The best modeling tools are FFNN for daily averaged data (with R 2 = 0.77 ) and TDNN for hourly averaged data (with R 2 = 0.66 ) where the best combinations of meteorological parameters are found to be temperature, relative humidity, pressure, and wind speed. As the models follow the patterns of diurnal cycles well, the results are considered to be satisfactory. When PN measurements are not directly available or there are massive missing PN concentration data, PN models can be used to estimate PN concentration using available measured meteorological parameters. View Full-Text
Keywords: particle number concentration; modeling; sensitivity analysis; artificial neural networks; feed-forward neural network; time-delay neural network particle number concentration; modeling; sensitivity analysis; artificial neural networks; feed-forward neural network; time-delay neural network
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MDPI and ACS Style

Zaidan, M.A.; Surakhi, O.; Fung, P.L.; Hussein, T. Sensitivity Analysis for Predicting Sub-Micron Aerosol Concentrations Based on Meteorological Parameters. Sensors 2020, 20, 2876.

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