( ( If ( that ( is ( going ( to happen ) ) ) ) ) ( , ( then ( ( the result ) ( ( will ( be ( ( more pollutants ) ( entering ( the air ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT that)) (VP (VBZ is) (VP (VBG going) (S (VP (TO to) (VP (VB happen)))))))) (, ,) (ADVP (RB then)) (NP (DT the) (NN result)) (VP (MD will) (VP (VB be) (NP (NP (JJR more) (NNS pollutants)) (VP (VBG entering) (NP (DT the) (NN air)))))) (. .)))
If that is going to happen, then the result will be more pollutants entering the air.
(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))))) (. .)))