( ( Examples ( of ( primary pollutants ) ) ) ( ( are ( ( ( ( ( ( ( ( exhaust fumes ) ( -LRB- ( gas -RRB- ) ) ) ( from cars ) ) , ) ( soot ( from smoke ) ) ) , ) ( ( dust ( ( storms and ) ash ) ) ( from ( volcanic eruptions ) ) ) ) ( -LRB- ( ( as ( seen ( in ( ( the picture ) ( on ( the left ) ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Examples)) (PP (IN of) (NP (JJ primary) (NNS pollutants)))) (VP (VBP are) (NP (NP (NP (NP (JJ exhaust) (NNS fumes)) (PRN (-LRB- -LRB-) (NP (NN gas)) (-RRB- -RRB-))) (PP (IN from) (NP (NNS cars)))) (, ,) (NP (NP (NN soot)) (PP (IN from) (NP (NN smoke)))) (, ,) (NP (NP (NN dust) (NNS storms) (CC and) (NNS ash)) (PP (IN from) (NP (JJ volcanic) (NNS eruptions)))) (PRN (-LRB- -LRB-) (SBAR (IN as) (S (VP (VBN seen) (PP (IN in) (NP (NP (DT the) (NN picture)) (PP (IN on) (NP (DT the) (NN left)))))))) (-RRB- -RRB-)))) (. .)))
Examples of primary pollutants are exhaust fumes (gas) from cars, soot from smoke, dust storms and ash from volcanic eruptions (as seen in the picture on the left).
(ROOT (S (NP (NP (NNP Ash)) (SBAR (WHNP (WDT that)) (S (VP (VBZ enters) (NP (DT the) (NN air)) (PP (ADVP (RB naturally)) (IN as) (NP (NP (DT a) (NN result)) (PP (IN of) (NP (DT a) (NN volcano) (NN eruption))))))))) (VP (VBZ is) (VP (VBN classified) (PP (IN as) (NP (DT a) (JJ primary) (NN pollutant))))) (. .)))