( ( But ( ( if ( ( ( all ( the ( outdated ( power plants ) ) ) ) ( in ( the ( Shenandoah ( National ( Park airshed ) ) ) ) ) ) ( were modified ) ) ) ( , ( ( ( the improvement ) ( in ( air quality ) ) ) ( would ( be ( ( the equivalent ) ( of ( ( removing ( ( 4 million ) cars ) ) ( form ( the roads ) ) ) ) ) ) ) ) ) ) ) ( , ( Menegay ( said . ) ) ) )
(ROOT (S (S (CC But) (SBAR (IN if) (S (NP (NP (PDT all) (DT the) (JJ outdated) (NN power) (NNS plants)) (PP (IN in) (NP (DT the) (NNP Shenandoah) (NNP National) (NNP Park) (NN airshed)))) (VP (VBD were) (VP (VBN modified))))) (, ,) (NP (NP (DT the) (NN improvement)) (PP (IN in) (NP (NN air) (NN quality)))) (VP (MD would) (VP (VB be) (NP (NP (DT the) (NN equivalent)) (PP (IN of) (S (VP (VBG removing) (NP (QP (CD 4) (CD million)) (NNS cars)) (S (VP (VB form) (NP (DT the) (NNS roads))))))))))) (, ,) (NP (NNP Menegay)) (VP (VBD said)) (. .)))
But if all the outdated power plants in the Shenandoah National Park airshed were modified, the improvement in air quality would be the equivalent of removing 4 million cars form the roads, Menegay said.
(ROOT (S (S (VP (VBG Limiting) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS cars)) (PP (IN on) (NP (DT the) (NNS roads)))))))) (VP (MD would) (ADVP (RBS most) (RB likely)) (VP (VB improve) (NP (DT the) (NN air) (NN quality)) (PP (IN in) (NP (JJ large) (NNS texas) (NNS cities))))) (. .)))