( Cyanide ( ( is ( emitted ( to ( air ( as ( ( ( hydrogen cyanide ) ( -LRB- ( HCN -RRB- ) ) ) ( ( gas or ) ( in ( ( various forms ) ( associated ( with ( particulate matter ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Cyanide)) (VP (VBZ is) (VP (VBN emitted) (S (VP (TO to) (VP (VB air) (PP (IN as) (NP (NP (NP (NN hydrogen) (NN cyanide)) (PRN (-LRB- -LRB-) (NP (NNP HCN)) (-RRB- -RRB-))) (UCP (NP (NN gas)) (CC or) (PP (IN in) (NP (NP (JJ various) (NNS forms)) (VP (VBN associated) (PP (IN with) (NP (JJ particulate) (NN matter)))))))))))))) (. .)))
Cyanide is emitted to air as hydrogen cyanide (HCN) gas or in various forms associated with particulate matter.
(ROOT (S (NP (NNP Hydrogen)) (VP (VBZ is) (PP (IN in) (NP (NP (NN gas) (NN form)) (PP (IN at) (NP (NN room) (NN temperature)))))) (. .)))