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Nanoparticle Number Concentration in the Air in Relation to the Time of the Year and Time of the Day

1
Air Quality Department, Czech Hydrometeorological Institute, 616 67 Brno, Czech Republic
2
Institute of Forensic Engineering, Brno University of Technology, 612 00 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Atmosphere 2020, 11(5), 523; https://doi.org/10.3390/atmos11050523
Received: 6 May 2020 / Revised: 15 May 2020 / Accepted: 15 May 2020 / Published: 19 May 2020
(This article belongs to the Special Issue Ambient Air Quality in the Czech Republic)
The paper analyzes suspended particles number concentrations of 61 size fractions (184 nm to 17,165 nm) in the air at a traffic location. The average course of the individual fractions was analyzed at various intervals – daily, weekly, monthly and annually, in the period between 2017 and 2019. The data was then used to calculate the arithmetic mean for all the fractions (MS Excel, R) and then using a proprietary web application, heatmaps were constructed. The obtained results showed significant differences in both the annual and daily variation of number concentrations between the individual fractions differing in particle size. In the case of the annual variation, one can see a greater variability of smaller particles, which is most likely due to the source of the actual suspended particles. Meteorological and dispersion conditions are found as important factors for suspended particle concentrations. These can lead to significant differences from year to year. However, a comparison between 2018 and 2019 showed that even though the average absolute number concentrations can differ between years, the actual relative number concentrations, i.e., the ratios between the individual fractions remain very similar. In conclusion it can be said that the difference between the number concentration variation of the size fractions depends on both the actual pollution sources (especially in the long-term, i.e., the annual variation) and the actual size of the particles, which plays a role especially in the short-term (daily, weekly variation). View Full-Text
Keywords: PM pollution; seasonality; air quality; meteorological conditions PM pollution; seasonality; air quality; meteorological conditions
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Brzezina, J.; Köbölová, K.; Adamec, V. Nanoparticle Number Concentration in the Air in Relation to the Time of the Year and Time of the Day. Atmosphere 2020, 11, 523.

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