Table 1.

Evaluation of the modelled HOM concentrations at the Station for Measuring Ecosystem-Atmosphere Relations II (SMEAR II)

Species	$Ō$	$\overline{M}$	R	NMB (%)	FAC2
Tot. HOM	0.54	0.58	0.72	8	0.93
Monomers	0.33	0.34	0.72	3	0.93
Dimers	0.09	0.07	0.73	−16	0.55
HOM-NO3	0.04	0.04	0.70	−11	0.66
HOM RO2	0.08	0.13	0.60	67	0.61

Observed average HOM concentrations $\left(Ō\right)$ (ppt_v), modelled average HOM concentration $\left(\overline{M}\right)$ (ppt_v), correlation coefficients (R), normalized mean bias (NMB) and the fraction of predictions within a factor of two of the observations (FAC2) at SMEAR II, 15–24 May 2013