The Nature paper Characterizing particulate polycyclic aromatic hydrocarbon emissions from diesel vehicles using a portable emissions measurement system addresses polycyclic aromatic hydrocarbons (p-PAHs) and both the text and the plot below make extended use of short, mixed-case abbreviations for various specific p-PAHs.
Question: Do these refer to some standardized naming convention for p-PAHs? If so, where can this be found?
Figure 2. Average distance-based emission factors for each p-PAH component according to the engine type.
(electronically-controlled fuel injection (EI) and mechanical pump fuel injection (MI))
For amino acids and nucleic acids for example, standard one- and three-letter abbreviations exist:
- Table of standard amino acid abbreviations and properties
- Table of Amino Acids and Their Abbreviations
- Nucleic acid notation
Here is an example of a plot where the abbreviations are not used. From Figure 20 of polycyclic aromatic hydrocarbons in automotive exhaust emissions and fuels: