( ( ( ( ( ( The ( number concentration ) ) ( is ( dominated ( by ( ultrafine particles ) ) ) ) ) ( , ( ( ( the ( surface area ) ) ( is ( dominated ( by ( fine particles ) ) ) ) ) , ) ) ) and ) ( ( ( volume or ) mass ) ( is ( dominated ( by ( fine ( and ( coarse particles ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN number) (NN concentration)) (VP (VBZ is) (VP (VBN dominated) (PP (IN by) (NP (JJ ultrafine) (NNS particles)))))) (PRN (, ,) (S (NP (DT the) (NN surface) (NN area)) (VP (VBZ is) (VP (VBN dominated) (PP (IN by) (NP (JJ fine) (NNS particles)))))) (, ,)) (CC and) (S (NP (NN volume) (CC or) (NN mass)) (VP (VBZ is) (VP (VBN dominated) (PP (IN by) (NP (JJ fine) (CC and) (JJ coarse) (NNS particles)))))) (. .)))
The number concentration is dominated by ultrafine particles, the surface area is dominated by fine particles, and volume or mass is dominated by fine and coarse particles.
(ROOT (S (NP (DT The) (NN term) (NN concentration)) (VP (VBZ describes) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NP (NNS items)) (PP (IN in) (NP (NP (DT a) (VBN given) (NN area)) (CC or) (NP (NN volume)))))))) (. .)))