( ( Acid rain ) ( ( is ( ( a ( ( particularly damaging ) component ) ) ( of ( air pollution ) ) ) ) . ) )
(ROOT (S (NP (JJ Acid) (NN rain)) (VP (VBZ is) (NP (NP (DT a) (ADJP (RB particularly) (JJ damaging)) (NN component)) (PP (IN of) (NP (NN air) (NN pollution))))) (. .)))
Acid rain is a particularly damaging component of air pollution.
(ROOT (S (NP (JJ Acid) (NN rain)) (VP (MD may) (VP (VB be) (VP (VBN caused) (PP (IN by) (NP (NN air) (NN pollution)))))) (. .)))