Montgomery
County
Technical
Support
Documentation
Summary
Montgomery
County
has
a
land
area
of
539
square
miles
and
is
located
in
the
northwest
portion
of
the
Middle
Grand
Division
of
Tennessee
on
the
Western
Highland
Rim.
It
is
located
along
the
I­
24
corridor
and
borders
Christian
County
Kentucky.
The
predominate
wind
direction
and
speed
is
from
the
south
at
7
to
10
knots.

There
is
no
ozone
monitor
located
in
Montgomery
County.
From
2000
through
2003
there
were
12
exceedances
of
the
8
hour
ozone
standard
reported
by
the
Christian
County
ozone
monitoring
site
located
in
Kentucky
in
the
Clarksville/
Hopkinsville
MSA
area
which
borders
Tennessee
and
includes
Montgomery
County,
Tennessee.
There
were
1
day
each
in
2000
and
2001
at
or
above
the
8
hour
standard.
There
were
9
days
in
2002
and
1
day
in
2003
at
or
above
the
8­
hour
standard
of
0.085
ppm.
For
the
2001
 
2003
monitoring
period,
the
ozone
monitor
in
Christian
County
reported
an
8
hour
design
value
of
0.085
parts
per
million
(
ppm),
barely
over
the
standard.

Based
on
projections
to
2002
from
the
2000
census
data,
there
are
138,241
persons
living
in
Montgomery
County.
This
indicates
a
population
density
of
256
persons
per
square
mile.
The
population
of
Montgomery
County
is
approximately
26%
rural
with
the
remaining
74%
living
in
incorporated
areas.
The
largest
city
in
Montgomery
County
is
Clarksville.
The
population
is
expected
to
increase
by
22%
between
2000
and
2010.
Based
on
the
2000
population
data
for
the
entire
Clarksville
TN­
KY
MSA,
Montgomery
County
represents
approximately
65%
of
the
total
MSA
population.

Point
source
NOX
emissions
from
Montgomery
County
were
estimated
at
2.18
ton/
day
in
1999
which
represents
approximately
35%
of
the
6.23
ton/
day
of
overall
NOX
point
source
emissions
from
the
Clarksville
MSA.
VOC
emissions
were
estimated
at
14.04
ton/
day
in
1999
which
represents
approximately
56%
of
the
24.98
ton/
day
of
overall
VOC
point
source
emissions
from
the
Clarksville
MSA.

For
NOX
and
VOC
control,
point
sources
located
within
Montgomery
County
are
subject
to
Prevention
of
Significant
Deterioration
(
PSD)
requirements,
Control
Technology
Guideline
Reasonable
Available
Control
Technology
(
CTG
RACT)
requirements,
Maximum
Achievable
Control
Technology
(
MACT)
requirements
for
Hazardous
Air
Pollutants
(
HAP),
and
New
Source
Performance
Standards
(
NSPS).

Mobile
source
NOX
emissions
from
Montgomery
County
were
estimated
at
13.22
ton/
day
in
1999
which
represents
approximately
52%
of
the
25.77
ton/
day
of
overall
NOX
mobile
source
emissions
from
the
Clarksville
MSA.
VOC
emissions
from
were
estimated
at
9.24
ton/
day
in
1999
which
represents
approximately
59%
of
the
15.77
ton/
day
of
overall
VOC
mobile
source
emissions
from
the
Clarksville
MSA.
Commuting
traffic
from
surrounding
counties
into
Montgomery
County
is
minimal.
Commuting
traffic
from
Montgomery
County
into
surrounding
counties
is
high.

Additionally,
the
federal
military
installation,
Fort
Campbell,
is
located
in
this
area
and
is
suspected
of
being
the
single
largest
contributor
to
mobile
source
emissions.
It
is
unclear
at
this
time,
how
mobile
emissions
from
this
installation
could
be
mitigated
and
therefore
managed
in
a
manner
that
would
bring
about
attainment
without
federal
acknowledgement
and
intervention.

An
analysis
of
the
backward
trajectories
of
the
air
masses
over
the
Ohio
Valley
(
Kentucky
 
Tennessee)
region
indicates
that
on
5
of
the
12
days
Tennessee
was
one
of
the
predominate
areas
from
which
the
air
mass
that
is
suspected
of
contributing
to
the
exceedances
at
the
Kentucky
monitoring
site
originated.
Kentucky
was
found
to
be
one
of
the
predominate
areas
from
which
the
air
mass
that
is
suspected
of
contributing
to
the
exceedances
at
the
Kentucky
monitoring
site
originated
on
8
of
these
days.
Illinois,
Indiana,
Georgia
and
Alabama
are
other
states
in
addition
to
Kentucky
or
Tennessee
that
contribute
to
the
air
masses
that
are
suspected
of
producing
the
exceedances
in
Kentucky.
The
analysis
of
the
trajectory
results
indicates
that
both
Kentucky
and
Tennessee
are
potentially
contributing
to
the
monitored
air
quality
in
the
Clarksville/
Hopkinsville
MSA
area.
Illinois,
Georgia,
Indiana,
Alabama
and
Mississippi
are
also
contributing.
