( ( ( ( ( ( Chemistry , ) Meteorology ) , ) and ) ( ( ( Ozone ( Ozone forms ) ) ( when ( ( certain chemical ) compounds ) ) ) ( -LRB- ( ( ( nitrogen oxides ) , ) NOx ) ) ) ) ; )
(ROOT (NP (NP (NP (NNP Chemistry)) (, ,) (NP (NNP Meteorology)) (, ,) (CC and) (NP (NP (NN Ozone) (NN Ozone) (NNS forms)) (SBAR (WHADVP (WRB when)) (S (NP (JJ certain) (NN chemical)) (VP (VBZ compounds)))) (PRN (-LRB- -LRB-) (NP (NN nitrogen) (NNS oxides)) (, ,) (NP (NNP NOx))))) (: ;)))
Chemistry, Meteorology, and Ozone Ozone forms when certain chemical compounds (nitrogen oxides, NOx;
(ROOT (S (NP (NN Ozone)) (VP (VBZ is) (NP (NP (DT a) (NN compound)) (VP (VBN formed) (SBAR (WHADVP (WRB when)) (S (NP (EX there)) (VP (VBZ is) (VP (VBG sparking) (NP (JJ electrical) (NN equipment))))))))) (. .)))