April
13,
2004
RE:
Classification
of
8­
hour
Ozone
Nonattainment
Areas
Using
Only
1­
hour
Ozone
Design
Values
Note
from:
John
Silvasi
Note
to:
Tom
Helms,
Leader,
Ozone
Policy
and
Strategies
Group
Attached
is
a
table
presenting
the
numbers
of
hypothetical
nonattainment
areas
under
original
proposed
classification
option
2
compared
to
the
classifications
using
only
1­
hour
ozone
design
values
and
Table
1
of
section
181(
a)(
1)
of
the
Act.
The
table
also
presents
the
number
of
areas
that
are
not
projected
to
attain
by
their
attainment
dates.
The
data
and
projections
are
taken
from
the
document,
"
Qualitative
Assessment
of
Alternative
Coverage
and
Classification
Options.
First
Addendum
to
"
Cost,
Emission
Reduction,
Energy,
and
Economic
Impact
Assessment
of
the
Proposed
Rule
Establishing
the
Implementation
Framework
for
the
8­
hour,
0.08ppm
Ozone
National
Ambient
Air
Quality
Standard."
Prepared
by
Innovative
Strategies
and
Economics
Group,
Air
Quality
Strategies
and
Standards
Division,
Office
of
Air
Quality
Planning
and
Standards,
Office
of
Air
and
Radiation,
U.
S.
Environmental
Protection
Agency,
Research
Triangle
Park,
North
Carolina.
April
8,
2004."
2
4/
12/
04
CLASSIFICATION
OPTIONS
COUNTS
OF
HYPOTHETICAL
NONATTAINMENT
AREAS
(
2000­
2002
data)

Subpart
2
Subpart
1*

ROW
Extreme
Severe­
17
Severe­
15
Serious
Moderate
Marginal
Total
A
Proposed
Option
2
#
areas
by
class
0
1
0
4
21
11
64
101
#
not
attain
by
attain
date*
3
11
2
15
31
B
Classification
of
8­
hr
NA
areas
using
only
1­
hr
DV's
and
original
table
1
from
section
181
#
areas
by
class
0
0
0
2
9
26
64
101
#
not
attain
by
attain
date*
2
5
14
15
36
#
not
attain
by
next
highest
classification
attain
date
2
3
8
13
*
2007
assumed
for
subpart
1
areas
(
although
the
max.
attain
date
can
be
out
to
2014)
