Table 4.

Comparison of adjusted R² for Plant/Scenario ANOVA models and various exposure metrics identified in univariate regression models.

Parameter	Scenario/Plant	Mass	Neutral sulfate	Amonium ion	Total sulfate	Acidic sulfate	Elemental carbon
F	0.4580	0.0080	0.0280	0.0410	−0.0150	0.0300	0.0290
Ti	0.3283	0.0050	0.0210	0.0310	−0.0150	0.0340	0.0130
Te	0.2566	−0.0060	−0.0020	0.0080	−0.0110	0.0320	0.0160
PEF	0.4301	0.0080	0.0880	0.1060	−0.0010	0.0290	0.0660
PIF	0.4339	0.0190	0.0260	0.0460	−0.0140	0.0180	0.1380
EF50	0.4979	0.0190	0.0730	0.0950	−0.0100	0.0390	0.0840
Tv	0.4132	0.0040	−0.0140	−0.0120	−0.0060	−0.0070	0.1450
MV	0.3948	0.0260	0.0390	0.0540	−0.0010	−0.0060	0.1030
Penh	0.4297	−0.0070	0.0440	0.0320	0.0280	−0.0150	−0.0140
PAU	0.3999	−0.0070	0.0660	0.0520	0.0310	−0.0150	−0.0140
EIP	0.2210	−0.0070	−0.0100	−0.0100	−0.0100	−0.0150	−0.0110
EEP	0.2383	−0.0120	0.0150	0.0090	−0.0140	0.0140	0.0170

^*Adjusted R² may have negative values because adjustment for model size.

Comparison of adjusted R2: The plant/scenario approach vastly outperforms any single component in predicting any given outcome of respiratory function.