Characterisation and calibration of low-cost PM sensors at high temporal resolution to reference-grade performance

Bulot, Florentin M.J.; Ossont, Steven J.; Morris, Andrew K.R. ORCID: https://orcid.org/0000-0002-5465-411X; Basford, Philip J.; Easton, Natasha H.C.; Mitchell, Hazel L.; Foster, Gavin L.; Cox, Simon J.; Loxham, Matthew. 2023 Characterisation and calibration of low-cost PM sensors at high temporal resolution to reference-grade performance. Heliyon, 9 (5), e15943. https://doi.org/10.1016/j.heliyon.2023.e15943

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Official URL: http://dx.doi.org/10.1016/j.heliyon.2023.e15943

Abstract/Summary

Particulate Matter (PM) low-cost sensors (LCS) present a cost-effective opportunity to improve the spatiotemporal resolution of airborne PM data. Previous studies focused on PM-LCS-reported hourly data and identified, without fully addressing, their limitations. However, PM-LCS provide measurements at finer temporal resolutions. Furthermore, government bodies have developed certifications to accompany new uses of these sensors, but these certifications have shortcomings. To address these knowledge gaps, PM-LCS of two models, 8 Sensirion SPS30 and 8 Plantower PMS5003, were collocated for one year with a Fidas 200S, MCERTS-certified PM monitor and were characterised at 2 min resolution, enabling replication of certification processes, and highlighting their limitations and improvements. Robust linear models using sensor-reported particle number concentrations and relative humidity, coupled with 2-week biannual calibration campaigns, achieved reference-grade performance, at median PM2.5 background concentration of 5.5 μg/m3, demonstrating that, with careful calibration, PM-LCS may cost-effectively supplement reference equipment in multi-nodes networks with fine spatiotemporality.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/j.heliyon.2023.e15943
ISSN:	24058440
Date made live:	05 Jun 2023 14:45 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/534776

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/j.heliyon.2023.e15943

ISSN:

24058440

Date made live:

05 Jun 2023 14:45 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/534776