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The real-time automatic and accurate measurement of the mass of ultrafine particles is especially challenging due to their low concentrations and the interferences of larger particles. This work introduces a new method to estimate PM 0.1  continuously. Based on the theoretical predictions of a 3-D chemical transport model, PM 0.1  and  N50  (number concentration of particles with a diameter above 50 nm) can have a very good correlation. This hypothesis is tested in this work by analyzing hourly measurements of size distributions, from different cities in Europe for a year. PM 0.1  had a strong spatial and temporal correlation with  N50  ( R2  &gt; 90%). The line passing through zero had an average slope of 0.16 ± 0.01 × 10 −9  µg, for an assumed particle density equal to 1 g cm −3 . This suggests that PM 0.1  can be, at least in principle, measured indirectly but quite accurately and continuously by measuring  N50  with a suitable condensation particle counter. Copyright © 2023 American Association for Aerosol Research

aerosol science and technology

Exploring the potential for continuous measurement of ultrafine particle mass concentration (PM 0.1 ) based on measurements of particle number concentration above 50 nm ( N                  50 )