Ambient
Air
Quality
Standards
Regulation
(
Not
for
Inclusion
into
the
Federal
SIP)

Ozone
AREA
CLASSIFICATION
BOUNDARY
Denver
1­
Hour
Ozone
Area
(
effective
10/
11/
01)
Attainment/
Maintenance
All
of
Denver,
Jefferson,
and
Douglas
Counties;
Boulder
County
(
excluding
Rocky
Mountain
National
Park)
and
the
Automobile
Inspection
and
Readjustment
Program
portions
of
Adams
and
Arapahoe
Counties.
See
attached
map.

8­
Hour
Ozone
Control
Area
Designation
Deferred
All
of
the
Counties
of
Adams,
Arapahoe,
Boulder,
Douglas,
Elbert,
Jefferson,
Larimer,
Morgan,
and
Weld,
and
all
of
the
Cities
and
Counties
of
Denver
and
Broomfield.
See
attached
map.
III.
M.
8­
Hour
Ozone
Control
Area
VIII.
S
Denver
8­
Hour
Ozone
Adopted:
March
12,
2004
The
purpose
of
this
rule
change
is
to
define
the
geographic
scope
of
the
Denver
8­
hour
Ozone
Nonattainment
Area
for
purposes
of
State
law
and
Commission
regulations.
This
definition
is
not
to
be
included
in
the
state
implementation
plan.

The
Commission
adopted
this
definition
in
conjunction
with
the
Ozone
Action
Plan
and
certain
revisions
to
of
Regulation
No.
7
to
reduce
emissions
of
volatile
organic
compounds
from
oil
and
gas
operations
and
from
stationary
and
portable
reciprocal
internal
combustion
engines.
Such
control
measures
in
sections
XVI,
XVI,
and
XVII
VI
of
Regulation
No.
7
apply
in
the
Denver
8­
hour
Ozone
Nonattainment
Area,
as
defined
in
the
Ambient
Air
Quality
Standards
Regulation.

The
U.
S.
EPA
will
also
define
the
geographic
scope
of
the
Denver
8­
hour
Ozone
Nonattainment
Area.
The
Commission
intends
for
its
State
definition
of
such
area
to
be
identical
to
the
federal
definition.
The
Commission
would
ordinarily
incorporate
the
federal
definition
by
reference
but
the
Commission
cannot
do
that
in
this
case
because
EPA
has
not
yet
adopted
a
final
rule
defining
the
Denver
8­
hour
Ozone
Nonattainment
Area
and
will
not
do
so
until
April
15,
2004
at
the
earliest.
Section
24­
4­
103(
12.5),
C.
R.
S.
prohibits
the
Commission
from
adopting
a
later
edition
of
the
federal
rule.
In
the
event
the
area
defined
by
the
federal
rule
is
smaller
than
the
area
defined
by
this
rule,
the
Commission
will
promptly
revise
this
rule
to
conform
to
the
federal
rule.

The
statutory
authority
to
define
the
nonattainment
area
is
set
out
in
sections
25­
7­
105(
1)(
a)
and
(
1)(
b);
25­
7­
106(
1)(
b)(
VIII),
(
1)(
c)
and
(
5);
and
25­
7­
109(
1)(
a)
and
(
2),
C.
R.
S.
