( ( Pollen ( blown ( by wind ) ) ) ( ( ( ( can ( travel ( to ( ( a distance ) ( of ( 15 meters ) ) ) ) ) ) and ) ( is ( ( most effective ) ( in ( conditions ( of ( ( ( ( ( low ( air turbulence ) ) , ) ( low humidity ) ) and ) ( low rainfall ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Pollen)) (VP (VBN blown) (PP (IN by) (NP (NN wind))))) (VP (VP (MD can) (VP (VB travel) (PP (TO to) (NP (NP (DT a) (NN distance)) (PP (IN of) (NP (CD 15) (NNS meters))))))) (CC and) (VP (VBZ is) (ADJP (ADJP (RBS most) (JJ effective)) (PP (IN in) (NP (NP (NNS conditions)) (PP (IN of) (NP (NP (JJ low) (NN air) (NN turbulence)) (, ,) (NP (JJ low) (NN humidity)) (CC and) (NP (JJ low) (NNS rainfall))))))))) (. .)))
Pollen blown by wind can travel to a distance of 15 meters and is most effective in conditions of low air turbulence, low humidity and low rainfall.
(ROOT (S (NP (JJ Meter) (JJ much) (NN distance)) (VP (MD can) (VP (VB beta) (NP (JJ particles) (NN travel)) (PP (IN through) (NP (NN air))))) (. .)))