(S (S (NP (BASENP (JJR Earlier) (NNS tests)) (VP (VP (VBN performed) (PP (IN on) (BASENP (DT the) (NN air)))) (PP (IN by) (NP (BASENP (NNS firefighters)) (CC and) (BASENP (NNP Haz-mat) (NNS officials)))))) (VP (VBD had) (VP (VBN shown) (SBAR (IN that) (S (NP (BASENP (DT the) (NN smoke) (CC and) (NNS fumes)) (VP (VBG rising) (PP (IN from) (BASENP (DT the) (NN fire))))) (VP (VP (VBP are) (RB not)) (ADJP (JJ dangerous) (CC or) (JJ toxic)))))))) (PERIOD .))