With no explanation, label each line with "O", "other-chemicalthing", "location-other", "organization-government/governmentagency", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting" or "art-writtenart" preceded by ":".
Those
studies
indicated
that
controlling
sulfur
dioxide
(
SO2
)
emissions
might
improve
winter
visual
range
in
the
Grand
Canyon
by
2
%
to
7
%
,
which
prompted
the
EPA
to
propose
a
rule
requiring
NGS
to
reduce
SO2
emissions
by
70
%
.
Those:O
studies:O
indicated:O
that:O
controlling:O
sulfur:O
dioxide:O
(:O
SO2:other-chemicalthing
):O
emissions:O
might:O
improve:O
winter:O
visual:O
range:O
in:O
the:O
Grand:location-other
Canyon:location-other
by:O
2:O
%:O
to:O
7:O
%:O
,:O
which:O
prompted:O
the:O
EPA:organization-government/governmentagency
to:O
propose:O
a:O
rule:O
requiring:O
NGS:O
to:O
reduce:O
SO2:other-chemicalthing
emissions:O
by:O
70:O
%:O
.:O