( ( According ( to ( current ( EPA guidelines ) ) ) ) ( , ( ( naphthalene ( -LRB- ( ( ( the ( active ingredient ) ) ( in mothballs ) ) -RRB- ) ) ) ( ( ( is not ) ( ( ( ( registered ( for use ) ) ( as ( ( a repellent ) ( on skunks ) ) ) ) , ) ( although ( ( many people ) ( ( use and ) ( continue ( to ( recommend it ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG According) (PP (TO to) (NP (JJ current) (NNP EPA) (NNS guidelines)))) (, ,) (NP (NP (NN naphthalene)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ active) (NN ingredient)) (PP (IN in) (NP (NNS mothballs)))) (-RRB- -RRB-))) (VP (VBZ is) (RB not) (VP (VBN registered) (PP (IN for) (NP (NN use))) (PP (IN as) (NP (NP (DT a) (NN repellent)) (PP (IN on) (NP (NNP skunks))))) (, ,) (SBAR (IN although) (S (NP (JJ many) (NNS people)) (VP (VP (VB use)) (CC and) (VP (VB continue) (S (VP (TO to) (VP (VB recommend) (NP (PRP it))))))))))) (. .)))
According to current EPA guidelines, naphthalene (the active ingredient in mothballs) is not registered for use as a repellent on skunks, although many people use and continue to recommend it.
(ROOT (S (NP (NNS Naphthalens)) (VP (VBZ is) (NP (NP (DT a) (NN chemical)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADVP (RB commonly)) (VP (VBN used) (PP (IN in) (NP (NNS mothballs))))))))) (. .)))