Table 3.

Summary of one-predictor models for N_d based on using any of nine of the final chemical species that were identified after applying the filtering scheme shown in Fig. 2. The coefficients correspond to a linear model of the form log(N_d) = a₀ + a₁ log(M_i), where M_i is the mass concentration of species i.

		Coefficients
Species	$R_{\text{adj}}^2$	a0	a1
${\text{Tot-SO}}_4^{2-}$	0.40	2.05	0.32
${\text{NH}}_4^{+}$	0.34	2.33	0.25
${\text{NSS-SO}}_4^{2-}$	0.29	2.13	0.28
MSA	0.26	2.37	0.31
${\text{NO}}_3^{-}$	0.24	2.12	0.25
Na	0.19	2.03	0.13
Ox	0.15	2.26	0.18
V	0.14	2.61	0.15
Fe	0.05	2.26	0.09