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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

Category: Urban Air Quality

Article In Press
DOI: 10.4209/aaqr.2019.03.0145
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Nicola Masey1,4, Eliani Ezani1,2, Jonathan Gillespie1, Fiona Sutherland1, Chun Lin3, Scott Hamilton4, Mathew R. Heal3, Iain J. Beverland 1

  • 1 Department of Civil and Environmental Engineering, University of Strathclyde, Glasgow, G1 1XJ, UK
  • 2 Department of Environmental and Occupational Health, Faculty of Medicine and Health Science, Universiti Putra Malaysia, Selangor, Malaysia
  • 3 School of Chemistry, Joseph Black Building, University of Edinburgh, Edinburgh, EH9 3FJ, UK
  • 4 Ricardo Energy and Environment, Glasgow, G2 4BG, UK

Highlights

  • 800 hourly eBC measurements from co-located AE51 & AE22 aethalometers.
  • AE51 & AE22 aethalometer concentrations highly correlated (R2 ≥ 0.87).
  • Correction of AE51 for filter loading overestimated corrected reference AE22.
  • Uncorrected AE51 consistent with corrected AE22 in low concentration environment.

Abstract

combustion-related air pollutants. We collected 786 hourly averaged equivalent black carbon (eBC) measurements from co-located duplicate portable AE51 Aethalometers and a UK Government reference AE22 Aethalometer (the data for the latter were corrected for filter darkening effects using a standard procedure), at an urban background site in Glasgow, UK. The AE51 and the reference concentrations were highly correlated (R2 ≥ 0.87) for the combined deployment periods. The application of a previously reported method for correcting the AE51’s underestimation of concentrations, associated with filter loading, generally led to an overestimation of values (specifically, the normalised mean bias values for the two AE51s increased from –2% and +3% to +14% and +25% across the full range of measurements after correction). We found only limited and inconsistent evidence that the AE51 Aethalometers (attenuation [AE51_ATN] ≤ ~52) underestimated the eBC concentrations compared to the reference measurements. Thus, our observations indicate that the AE51 can achieve close agreement with the reference AE22 monitor without applying corrections for filter loading at relatively low AE51_ATN values in environments with low eBC concentrations.

Keywords

Air pollution Equivalent black carbon Aethalometer Micro-aethalometer Attenuation Filter loading


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