As Heald told The Huffington Post, US surface ozone has dropped partly due to the Clean Air Act.
1	As	as	SCONJ	IN	_	3	mark	3:mark	Discourse=attribution-positive:54->55:0
2	Heald	Heald	PROPN	NNP	Number=Sing	3	nsubj	3:nsubj	Entity=(47-person-giv:inact-cf1-1-coref-Colette_Heald)
3	told	tell	VERB	VBD	Mood=Ind|Number=Sing|Person=3|Tense=Past|VerbForm=Fin	12	advcl	12:advcl:as	_
4	The	the	DET	DT	Definite=Def|PronType=Art	6	det	6:det	Entity=(48-organization-giv:inact-cf2-2,3-coref-HuffPost|XML=<ref>
5	Huffington	Huffington	PROPN	NNP	Number=Sing	6	compound	6:compound	_
6	Post	Post	PROPN	NNP	Number=Sing	3	obj	3:obj	Entity=48)|SpaceAfter=No|XML=</ref>
7	,	,	PUNCT	,	_	3	punct	3:punct	_
8	US	US	PROPN	NNP	Abbr=Yes|Number=Sing	10	compound	10:compound	Bridge=5<113|Discourse=adversative-concession:55->49:1|Entity=(113-substance-acc:inf-cf4-3-coref(15-place-giv:inact-cf3-1-coref-United_States)
9	surface	surface	NOUN	NN	Number=Sing	10	compound	10:compound	_
10	ozone	ozone	NOUN	NN	Number=Sing	12	nsubj	12:nsubj|14:nsubj:xsubj	Entity=113)
11	has	have	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	12	aux	12:aux	_
12	dropped	drop	VERB	VBN	Tense=Past|VerbForm=Part	0	root	0:root	_
13	partly	partly	ADV	RB	Degree=Pos	14	advmod	14:advmod	_
14	due	due	ADJ	JJ	Degree=Pos	12	xcomp	12:xcomp	_
15	to	to	ADP	IN	_	19	case	19:case	_
16	the	the	DET	DT	Definite=Def|PronType=Art	19	det	19:det	Entity=(114-abstract-new-cf5-2,3,4-coref-Clean_Air_Act_of_1963
17	Clean	Clean	PROPN	NNP	Number=Sing	18	compound	18:compound	Entity=(115-substance-new-cf6-1,2-sgl|XML=<ref>
18	Air	Air	PROPN	NNP	Number=Sing	19	compound	19:compound	Entity=115)
19	Act	Act	PROPN	NNP	Number=Sing	12	obl	12:obl:to	Entity=114)|SpaceAfter=No|XML=</ref>
20	.	.	PUNCT	.	_	12	punct	12:punct	_
