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The potential of high temporal resolution automatic measurements of PM2.5 composition as an alternative to the filter-based manual method used in routine monitoring

Authors: Marsailidh M. Twigg; Chiara F. Di Marco; Elizabeth A. McGhee; Christine F. Braban; Eiko Nemitz; Richard J.C. Brown; Kevin C. Blakley; +18 Authors

The potential of high temporal resolution automatic measurements of PM2.5 composition as an alternative to the filter-based manual method used in routine monitoring

Abstract

Under the EU Air Quality Directive (AQD) 2008/50/EC member states are required to undertake routine monitoring of PM2.5 composition at background stations. The AQD states for PM2.5 speciation this should include at least: nitrate (NO3−), sulfate (SO42−), chloride (Cl−), ammonium (NH4+), sodium (Na+), potassium (K+), magnesium (Mg2+), calcium (Ca2+), elemental carbon (EC) and organic carbon (OC). Until 2017, it was the responsibility of each country to determine the methodology used to report the composition for the inorganic components of PM2.5. In August 2017 a European standard method of measurement of PM2.5 inorganic chemical components (NO3−, SO42−, Cl−, NH4+, Na+, K+, Mg2+, Ca2+) as deposited on filters (EN16913:2017) was published. From August 2019 this then became the European standard method. This filter method is labour-intensive and provides limited time resolution and is prone to losses of volatile compounds. There is therefore increasing interest in the use of alternative automated methods. For example, the UK reports hourly PM2.5 chemical composition using the Monitor for AeRosols and Gases in Ambient air (MARGA, Metrohm, NL). This study is a pre-assessment review of available data to demonstrate if or to what extent equivalence is possible using either the MARGA or other available automatic methods, including the Aerosol Chemical Speciation Monitor (ACSM, Aerodyne Research Inc. US) and the Ambient Ion Monitor (AIM, URG, US). To demonstrate equivalence three objectives were to be met. The first two objectives focused on data capture and were met by all three instruments. The third objective was to have less than a 50% expanded uncertainty compared to the reference method for each species. Analysis of this objective was carried out using existing paired datasets available from different regions around the world. It was found that the MARGA (2006–2019 model) had the potential to demonstrate equivalence for all species in the standard, though it was only through a combination of case studies that it passed uncertainty criteria. The ACSM has the potential to demonstrate equivalence for NH4+, SO42−, and in some conditions NO3−, but did not for Cl− due to its inability to quantify refractory aerosol such as sea salt. The AIM has the potential for NH4+, NO3−, SO42−, Cl− and Mg2+. Future investigations are required to determine if the AIM could be optimised to meet the expanded uncertainty criterion for Na+, K+ and Ca2+. The recommendation is that a second stage to demonstrate equivalence is required which would include both laboratory and field studies of the three candidate methods and any other technologies identified with the potential to report the required species.

The authors would like to thank the UK Environment Agency who funded this study. The measurements in this study were funded by the following bodies: - All the UK datasets were funded by UK Environment Agency under the UK Eutrophying and Acidifying Pollutant Network and the UKs Particle Numbers and Concentrations Network. The Auchencorth Moss measurements are supported by NERC UK Status, change and Projections of the Environment UK-SCaPE (NE/R016429/1). - The Revin fieldsite is coordinated by IMT Nord Europe in collaboration with the regional monitoring network (Atmo Grand-Est) and the National Reference Laboratory for Air Quality Monitoring (LCSQA) and funded by the French Ministry of Environment. ACSM measurements were supported by the Labex CaPPA project, which is funded by the French National Research Agency (ANR) through the PIA (Programme d’Investissement d’Avenir) under contract ANR-11-LABX-0005-01, and were part of the COST COLOSSAL Action CA16109. - Measurements in Barcelona Palau Reial were funded by the Spanish Ministry of Science and Innovation through CAIAC project (PID2019-108990RB-I00) and FEDER funds, through EQC2018-004598-P. - Measurements at the Mace Head Atmospheric Research Station are supported by the EPA-Ireland and the Department of Environment, Climate and Communications. - The Germany Federal Environment Agency (UBA) provided the financial support of this study and the deployment of the MARGA at the research station Melpitz under contracts No: 351 01 093 and 351 01 070. - The data from Kumpula was supported by the Academy of Finland as part of the Centre of Excellence program (project no 1118615). - US EPA gratefully acknowledges the contributions of Battelle and Wood (formerly Amec, Foster Wheeler) to the Research Triangle Park study. - The data from the San Pietro Capofiume was funded by the PEGASOS EU FP7 project.

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Countries
Spain, United Kingdom, France
Keywords

[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Atmospheric Science, inorganic aerosol, MARGA, HR-TOF-AMS, PM2.5, Atmospheric Sciences, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, ACSM, Computer Science, PM inorganic aerosol 2.5,, Data and Information, AIM, Ensure healthy lives and promote well-being for all at all ages, General Environmental Science

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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