( ( ( His work ) ( on ( airborne particulates ) ) ) ( ( is ( directly ( relevant ( to ( ( ( the ( First State ) ) , ) ( where ( ( the air ) ( frequently ( exceeds ( ( the ( primary ( regulatory standard ) ) ) ( for ( ( this and ) ( other ( criteria pollutants ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (PRP$ His) (NN work)) (PP (IN on) (NP (JJ airborne) (NNS particulates)))) (VP (VBZ is) (ADJP (RB directly) (JJ relevant) (PP (TO to) (NP (NP (DT the) (NNP First) (NNP State)) (, ,) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN air)) (ADVP (RB frequently)) (VP (VBZ exceeds) (NP (NP (DT the) (JJ primary) (JJ regulatory) (NN standard)) (PP (IN for) (NP (NP (DT this)) (CC and) (NP (JJ other) (NNS criteria) (NNS pollutants)))))))))))) (. .)))
His work on airborne particulates is directly relevant to the First State, where the air frequently exceeds the primary regulatory standard for this and other criteria pollutants.
(ROOT (S (NP (JJ Primary) (NNS pollutants)) (VP (VBP enter) (NP (DT the) (NN air)) (ADVP (RB directly))) (. .)))