ARI	Adjusted Rand index
BB	Biomass burning
CLR	Centred log-ratio
COMP	Compositional-profile approach
CR	Carcinogenic risk
DISP	Displacement analysis
EC	Elemental carbon
EC50	Effective concentration causing 50% inhibition
EPA	United States Environmental Protection Agency
EUSAAR-II	European Supersites for Atmospheric Aerosol Research II
HI	Hazard index
HPAEC-PAD	High-performance anion-exchange chromatography with pulsed amperometric detection
ICP-MS	Inductively coupled plasma mass spectrometry
ICP-OES	Inductively coupled plasma optical emission spectrometry
ITCZ	Intertropical Convergence Zone
LOD	Limit of detection
OC	Organic carbon
OM	Organic matter
PAHs	Polycyclic aromatic hydrocarbons
PC	Principal component
PCA	Principal component analysis
PM	Particulate matter
PM2.5	Particulate matter with an equivalent aerodynamic diameter ≤ 2.5 µm
PM10	Particulate matter with an equivalent aerodynamic diameter ≤ 10 µm
PMF	Positive Matrix Factorisation
PVDF	Polyvinylidene fluoride
RH	Relative humidity
RI	Potential ecological risk index
RMSE	Root mean square error
SA + BB	Secondary aerosol and biomass burning
SD	Standard deviation
TU	Toxicity unit
TU5	Toxicity unit after 5 min of exposure
TU15	Toxicity unit after 15 min of exposure
TU30	Toxicity unit after 30 min of exposure
ΔTU	Difference between TU15 and TU5
WHO	World Health Organization
WSI	Water-soluble inorganic ions