Molecular composition of organic aerosols at urban background and road tunnel sites using ultra-high resolution mass spectrometry

Research output: Contribution to journalArticlepeer-review


  • Haijie Tong
  • Ivan Kourtchev
  • Pallavi Pant
  • Ian J Keyte
  • Ian P O'Connor
  • John C Wenger
  • Markus Kalberer

Colleges, School and Institutes


Organic aerosol composition in the urban atmosphere is highly complex and strongly influenced by vehicular emissions which vary according to the make-up of the vehicle fleet. Normalized test measurements do not necessarily reflect real-world emission profiles and road tunnels are therefore ideal locations to characterise realistic traffic particle emissions with minimal interference from other particle sources and from atmospheric aging processes affecting their composition. In the current study, the composition of fine particles (diameter ≤2.5 μm) at an urban background site (Elms Road Observatory Site) and a road tunnel (Queensway) in Birmingham, UK, were analysed with direct infusion, nano-electrospray ionisation ultrahigh resolution mass spectrometry (UHRMS). The overall particle composition at these two sites is compared with an industrial harbour site in Cork, Ireland, with special emphasis on oxidised mono-aromatics, polycyclic aromatic hydrocarbons (PAHs) and nitro-aromatics. Different classification criteria, such as double bond equivalents, aromaticity index and aromaticity equivalent are used and compared to assess the fraction of aromatic components in the approximately one thousand oxidized organic compounds at the different sampling locations.


Original languageEnglish
JournalFaraday Discussions
Early online date21 Dec 2015
Publication statusPublished - 4 May 2016