Consistency of urban background black carbon concentration measurements by portable AE51 and reference AE22 aethalometers: effect of corrections for filter loading

Nicola Masey, Eliani Ezani, Jonathan Gillespie, Fiona Sutherland, Chun Lin, Scott Hamilton, Mathew R. Heal, Iain J. Beverland

Research output: Contribution to journalArticle

Abstract

Measurement of exposure to black carbon with portable monitoring devices is an important part of research on the health impacts of combustion-related air pollutants. We collected 786 hourly-averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AethLab AE51 aethalometers and a UK government reference Magee Scientific AE22 aethalometer (latter adjusted for filter darkening effects using a standard procedure for UK government AE22 aethalometers) at an urban background site in Glasgow, UK. AE51 and reference AE22 aethalometer concentrations were highly correlated (R2 ≥ 0.87) over the combined deployment periods. Application of a previously-reported method for correction of underestimation of concentrations by AE51 monitors associated with filter loading generally overestimated [corrected] reference AE22 aethalometer eBC concentrations (e.g. for two AE51 monitors normalised mean bias = +14% and +25% for literature-based correction method cf. -2% and +3% for unadjusted AE51 data across the full range of measurements). We found limited and inconsistent evidence for underestimation of eBC cf. corrected AE22 eBC measurements for the two AE51 instruments evaluated (for AE51 attenuation (ATN) ≤ ~52). Our observations suggest that the AE51 monitors we evaluated do not require correction for filter loading, at relatively low ATN values in environments with low eBC concentrations, to achieve close agreement with UK government corrected AE22 eBC measurements.
LanguageEnglish
JournalAerosol and Air Quality Research
Publication statusAccepted/In press - 1 Aug 2019

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Carbon black
Health
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Keywords

  • air pollution
  • equivalent black carbon
  • aethalometer
  • micro-aethalometer
  • attenuation
  • filter loading

Cite this

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title = "Consistency of urban background black carbon concentration measurements by portable AE51 and reference AE22 aethalometers: effect of corrections for filter loading",
abstract = "Measurement of exposure to black carbon with portable monitoring devices is an important part of research on the health impacts of combustion-related air pollutants. We collected 786 hourly-averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AethLab AE51 aethalometers and a UK government reference Magee Scientific AE22 aethalometer (latter adjusted for filter darkening effects using a standard procedure for UK government AE22 aethalometers) at an urban background site in Glasgow, UK. AE51 and reference AE22 aethalometer concentrations were highly correlated (R2 ≥ 0.87) over the combined deployment periods. Application of a previously-reported method for correction of underestimation of concentrations by AE51 monitors associated with filter loading generally overestimated [corrected] reference AE22 aethalometer eBC concentrations (e.g. for two AE51 monitors normalised mean bias = +14{\%} and +25{\%} for literature-based correction method cf. -2{\%} and +3{\%} for unadjusted AE51 data across the full range of measurements). We found limited and inconsistent evidence for underestimation of eBC cf. corrected AE22 eBC measurements for the two AE51 instruments evaluated (for AE51 attenuation (ATN) ≤ ~52). Our observations suggest that the AE51 monitors we evaluated do not require correction for filter loading, at relatively low ATN values in environments with low eBC concentrations, to achieve close agreement with UK government corrected AE22 eBC measurements.",
keywords = "air pollution, equivalent black carbon, aethalometer, micro-aethalometer, attenuation, filter loading",
author = "Nicola Masey and Eliani Ezani and Jonathan Gillespie and Fiona Sutherland and Chun Lin and Scott Hamilton and Heal, {Mathew R.} and Beverland, {Iain J.}",
year = "2019",
month = "8",
day = "1",
language = "English",
journal = "Aerosol and Air Quality Research",
issn = "1680-8584",
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Consistency of urban background black carbon concentration measurements by portable AE51 and reference AE22 aethalometers : effect of corrections for filter loading. / Masey, Nicola; Ezani, Eliani; Gillespie, Jonathan; Sutherland, Fiona; Lin, Chun; Hamilton, Scott; Heal, Mathew R.; Beverland, Iain J.

In: Aerosol and Air Quality Research, 01.08.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Consistency of urban background black carbon concentration measurements by portable AE51 and reference AE22 aethalometers

T2 - Aerosol and Air Quality Research

AU - Masey, Nicola

AU - Ezani, Eliani

AU - Gillespie, Jonathan

AU - Sutherland, Fiona

AU - Lin, Chun

AU - Hamilton, Scott

AU - Heal, Mathew R.

AU - Beverland, Iain J.

PY - 2019/8/1

Y1 - 2019/8/1

N2 - Measurement of exposure to black carbon with portable monitoring devices is an important part of research on the health impacts of combustion-related air pollutants. We collected 786 hourly-averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AethLab AE51 aethalometers and a UK government reference Magee Scientific AE22 aethalometer (latter adjusted for filter darkening effects using a standard procedure for UK government AE22 aethalometers) at an urban background site in Glasgow, UK. AE51 and reference AE22 aethalometer concentrations were highly correlated (R2 ≥ 0.87) over the combined deployment periods. Application of a previously-reported method for correction of underestimation of concentrations by AE51 monitors associated with filter loading generally overestimated [corrected] reference AE22 aethalometer eBC concentrations (e.g. for two AE51 monitors normalised mean bias = +14% and +25% for literature-based correction method cf. -2% and +3% for unadjusted AE51 data across the full range of measurements). We found limited and inconsistent evidence for underestimation of eBC cf. corrected AE22 eBC measurements for the two AE51 instruments evaluated (for AE51 attenuation (ATN) ≤ ~52). Our observations suggest that the AE51 monitors we evaluated do not require correction for filter loading, at relatively low ATN values in environments with low eBC concentrations, to achieve close agreement with UK government corrected AE22 eBC measurements.

AB - Measurement of exposure to black carbon with portable monitoring devices is an important part of research on the health impacts of combustion-related air pollutants. We collected 786 hourly-averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AethLab AE51 aethalometers and a UK government reference Magee Scientific AE22 aethalometer (latter adjusted for filter darkening effects using a standard procedure for UK government AE22 aethalometers) at an urban background site in Glasgow, UK. AE51 and reference AE22 aethalometer concentrations were highly correlated (R2 ≥ 0.87) over the combined deployment periods. Application of a previously-reported method for correction of underestimation of concentrations by AE51 monitors associated with filter loading generally overestimated [corrected] reference AE22 aethalometer eBC concentrations (e.g. for two AE51 monitors normalised mean bias = +14% and +25% for literature-based correction method cf. -2% and +3% for unadjusted AE51 data across the full range of measurements). We found limited and inconsistent evidence for underestimation of eBC cf. corrected AE22 eBC measurements for the two AE51 instruments evaluated (for AE51 attenuation (ATN) ≤ ~52). Our observations suggest that the AE51 monitors we evaluated do not require correction for filter loading, at relatively low ATN values in environments with low eBC concentrations, to achieve close agreement with UK government corrected AE22 eBC measurements.

KW - air pollution

KW - equivalent black carbon

KW - aethalometer

KW - micro-aethalometer

KW - attenuation

KW - filter loading

UR - http://www.aaqr.org/

M3 - Article

JO - Aerosol and Air Quality Research

JF - Aerosol and Air Quality Research

SN - 1680-8584

ER -