( ( ( ( air pollution ) , ) ( primary-secondary ( care interface ) ) ) ; )
(ROOT (NP (NP (NN air) (NN pollution)) (, ,) (NP (JJ primary-secondary) (NN care) (NN interface)) (: ;)))
air pollution, primary-secondary care interface;
(ROOT (S (NP (JJ Primary) (NNS pollutants)) (VP (VBP enter) (NP (DT the) (NN air)) (ADVP (RB directly))) (. .)))