1
Attachment
5
to
the
Technical
Support
Document
of
the
Dallas/
Fort
Worth
(
D/
FW)
IOP
30
TAC
Chapter
117
,
Rule
Project
No.
2005­
004­
117­
AI
Control
of
Air
Pollution
from
Nitrogen
Compounds­
Point
Source
NOx
for
the
D/
FW
Area
Prepared
by
Alan
Shar,
Air
Planning
Section
(
6PD­
L)

This
attachment
to
the
TSD
is
being
prepared
in
support
of
EPA's
rulemaking
action
to
approve
revisions
made
to
30
TAC
Chapter
117
rule,
as
the
Texas
Commission
on
Environmental
Quality
(
TCEQ)
adopted
on
April
27,
2005.
The
TCEQ
submitted
revisions
to
the
Texas
State
Implementation
Plan
(
SIP)
in
a
letter,
from
Chairman
Kathleen
Hartnett
White
to
EPA
Regional
Administrator
Richard
Greene,
dated
May
13,
2005,
for
review
and
approval
in
order
to
become
a
part
of
the
EPA­
approved
Texas
SIP.
Under
this
SIP
submittal,
the
affected
sources
are
primarily
the
lean­
burn,
rich­
burn,
and
dual­
fuel
(
gas
and
liquid)
fired
lean
burn
reciprocating
internal
combustion
(
IC)
engines
located
in
the
Texas
Counties
of
Collin,
Dallas,
Denton,
Ellis,
Johnson,
Kaufman,
Parker,
Rockwall,
and
Tarrant.
The
air
pollutant
of
concern
is
Oxides
of
Nitrogen
(
NOx).
See
the
definitions
of
IC
engine,
lean
burn,
rich
burn,
and
NOx
later
in
this
attachment.

A
summary
of
rule
revision
history
is
as
follows:

Rule
Project
No.
2005­
004­
117­
EN
Chapter
117
NO
x
Rule:
D/
FW
Increment
of
Progress;
and
Technical
Changes
and
Clarifications
Amendments
to:
Sections
117.114,
117.201,
117.203,
117.206,
117.213,
117.214,
117.479,
117.520
Date
Adopted:
April
27,
2005
Date
Filed
with
the
Secretary
of
State:
April
29,
2005
Date
Published
in
the
Texas
Register:
May
13,
2005
Date
Effective:
May
19,
2005
The
affected
sections
of
the
revised
30
TAC
Chapter
117
are
presented
in
Table
A.

Table
A
­
Affected
sections
of
Chapter
117
Section
Description
117.114
Emission
Testing
and
Monitoring
for
Houston­
Galveston
Attainment
Demonstration.

117.201
Applicability.

117.203
Exemptions.

117.206
Emission
Specifications
for
Attainment
Demonstrations.

117.213
Continuous
Demonstration
of
Compliance.
Section
Description
2
117.214
Emission
Testing
and
Monitoring
for
the
Houston­
Galveston
Attainment
Demonstration.

117.479
Monitoring,
Recordkeeping,
and
Reporting
Requirements.

117.520
Compliance
Schedule
for
Industrial,
Commercial,
and
Institutional
Combustion
Sources
in
ozone
Nonattainment
Areas.

Some
of
the
most
commonly
used
terminologies
in
this
evaluation:

What
is
Nitrogen
oxides
(
NOx)?
NOx
is
the
sum
of
the
nitric
oxide
and
nitrogen
dioxide
in
the
flue
gas
or
emission
point,
collectively
expressed
as
nitrogen
dioxide.

What
is
stationary
internal
combustion
(
IC)
engine?
A
reciprocating
engine
that
remains
or
will
remain
at
a
location
(
a
single
site
at
a
building,
structure,
facility,
or
installation)
for
more
than
12
consecutive
months.
Included
in
this
definition
is
any
engine
that,
by
itself
or
in
or
on
a
piece
of
equipment,
is
portable,
meaning
designed
to
be
and
capable
of
being
carried
or
moved
from
one
location
to
another.
Indicia
of
portability
include,
but
are
not
limited
to,
wheels,
skids,
carrying
handles,
dolly,
trailer,
or
platform.
Any
engine
(
or
engines)
that
replaces
an
engine
at
a
location
and
that
is
intended
to
perform
the
same
or
similar
function
as
the
engine
being
replaced
is
included
in
calculating
the
consecutive
residence
time
period.
An
engine
is
considered
stationary
if
it
is
removed
from
one
location
for
a
period
and
then
returned
to
the
same
location
in
an
attempt
to
circumvent
the
consecutive
residence
time
requirement.
Non­
road
engines,
as
defined
in
40
CFR
§
89.2,
are
not
considered
stationary
for
the
purposes
of
this
chapter.

What
is
a
lean
burn
engine?
Lean
burn
engine
is
a
spark­
ignited
or
compression­
ignited,
Otto
cycle,
diesel
cycle,
or
two­
stroke
engine
that
is
not
capable
of
being
operated
with
an
exhaust
stream
oxygen
concentration
equal
to
or
less
than
0.5%
by
volume,
as
originally
designed
by
the
manufacturer.

What
is
a
rich
burn
engine?
Rich
burn
engine
is
a
spark­
ignited,
Otto
cycle,
four­
stroke,
naturally
aspirated
or
turbocharged
engine
that
is
capable
of
being
operated
with
an
exhaust
stream
oxygen
concentration
equal
to
or
less
than
0.5%
by
volume,
as
originally
designed
by
the
manufacturer.

Relevant
Rulemaking
Actions:
On
March
3,
2000
(
65
FR
11468)
EPA
approved
NOx
emissions
limitations
for
the
rich
burn
IC
engines
as
a
part
of
ozone
attainment
measures
for
the
Beaumont/
Port
Arthur
(
B/
PA)
and
Houston/
Galveston
(
H/
GA)
ozone
nonattainment
areas.
See
Table
II
of
the
65
FR
11468.
3
Table
B
­
NOx
emissions
limitations
from
IC
engines
per
65
FR
11468
rulemaking
Source
NOx
limit
Additional
information
Internal
Combustion
Engines
2.0
gram/
hp­
hr
Natural
gas,
rich
burn,
stationary,
capacity
greater
than
or
equal
to
150
hp
in
H/
GA,
and
capacity
greater
than
or
equal
to
300
hp
in
B/
PA
On
September
1,
2000
(
65
FR
53172)
EPA
approved
NOx
emissions
limitations
for
the
IC
engines
as
a
part
of
the
ozone
attainment
measures
for
the
B/
PA,
H/
GA,
and
D/
FW
ozone
nonattainment
areas.
See
Table
II
of
the
65
FR
53172.

Table
C
­
NOx
emissions
limitations
from
IC
engines
per
65
FR
53172
rulemaking
Source
NOx
limit
Additional
information
Internal
Combustion
Engines
3.0
gram/
hp­
hr
Natural
gas,
lean
burn,
stationary,
capacity
greater
than
or
equal
to
150
hp
in
H/
GA,
capacity
greater
than
or
equal
to
300
hp
in
B/
PA
or
D/
FW*.
Also
a
3.0
gram/
hp­
hr
limit
for
CO.

*
The
D/
FW
area
in
Table
C
(
September
1,
2000
rulemaking
action
65
FR
53172)
is
comprised
of
the
4
Texas
Counties
of
Collin,
Dallas,
Denton,
and
Tarrant
(
core
4
nonattainment
counties).

On
March
16,
2001
(
66
FR
15195)
EPA
approved
NOx
emissions
specification
for
IC
engines
as
a
part
of
the
ozone
control
measures
for
the
D/
FW
one­
hour
ozone
nonattainment
area
that
included
the
four
Texas
Counties
of
Collin,
Dallas,
Denton,
and
Tarrant.
See
Table
III
of
the
66
FR
15195.
Table
D
contains
a
summary
of
the
66
FR
15195
rulemaking
action
for
IC
engines
operating
in
the
four
county
D/
FW
one­
hour
ozone
nonattainment
area.

Table
D
­
Affected
Sources,
NOx
Emission
Specification,
and
Additional
Information
Source
NOx
Emission
Specification
Additional
information
Internal
Combustion
Engines
2.0
gram/
hp­
hr
Natural
gas,
gas/
liquid­
fired,
lean
burn,
stationary,
capacity
$
300
hp
in
D/
FW*.
Also
a
3.0
gram/
hphr
limit
for
CO.

*
The
D/
FW
area
in
Table
D
(
March
16,
2001
rulemaking
action
66
FR
15195)
is
comprised
of
the
4
Texas
Counties
of
Collin,
Dallas,
Denton,
and
Tarrant
(
core
4
nonattainment
counties).

In
this
proposed
rulemaking
action,
as
submitted
to
us
with
a
letter
dated
May
13,
2005,
Texas
is
extending
the
NOx
emissions
limitations
from
gas
fired
rich
burn
and
gas
fired
lean
burn
IC
engines
to
the
Counties
of
Ellis,
Johnson,
Kaufman,
Parker
and
Rockwall
(
the
surrounding
counties).
This
revision
to
the
SIP
will
limit
emissions
of
NOx
from
rich
burn
and
lean
burn
IC
engines
as
shown
in
Table
E.
As
a
result,
NOx
emissions
from
IC
engines
located
in
9
Texas
Counties
(
Collin,
Dallas,
Denton,
and
Tarrant
+
Ellis,
Johnson,
Kaufman,
Parker
and
Rockwall)
4
will
be
regulated
per
Table
E
of
this
attachment.
The
current
EPA­
approved
Texas
SIP
does
not
contain
NOx
emission
limitations
from
IC
engines
located
within
the
Ellis,
Johnson,
Kaufman,
Parker
and
Rockwall
counties.
Section
117.206
concerns
Emission
Specifications
for
Attainment
Demonstrations.
This
section
establishes
more
stringent
NOx
limits
for
gas
fired
rich
burn
IC
engines
placed
in
operation
after
January
2000
in
the
nine
counties
(
see
117.206(
b)(
3)(
B)(
ii))
and
will
result
in
additional
NOx
reductions
for
the
D/
FW
area.
Therefore
section
117.206
should
be
given
approval.

Table
E
­
NOx
limitations
from
IC
engines
per
proposed
rulemaking
Source
NOx
limit
Additional
information
Internal
Combustion
Engines
2.0
gram/
hphr
Gas­
fired
and
dual­
fuel,
lean
burn
(
Collin,
Dallas,
Denton
and
Tarrant
Counties),
capacity
greater
than
or
equal
to
300
hp,
also
3.0
gram/
hp­
hr
for
CO.
See
117.206(
b)(
2)

Internal
Combustion
Engines
2.0
gram/
hphr
Gas­
fired
lean
burn
(
Collin,
Dallas,
Denton,
Ellis,
Johnson,
Kaufman,
Parker,
Rockwall
and
Tarrant
Counties),
capacity
greater
than
or
equal
to
300
hp,
also
3.0
gram/
hp­
hr
for
CO.
See
117.206(
b)(
3)

Internal
Combustion
Engines
2.0
gram/
hphr
Gas­
fired
rich
burn
in
operation
before
January
2000
(
Collin,
Dallas,
Denton,
Ellis,
Johnson,
Kaufman,
Parker,
Rockwall
and
Tarrant
Counties),
capacity
greater
than
or
equal
to
300
hp,
also
3.0
gram/
hp­
hr
for
CO.
See
117.206(
b)(
3)(
B)(
i)

Internal
Combustion
Engines
0.5
gram/
hphr
Gas­
fired
rich
burn
in
operation
after
January
2000
(
Collin,
Dallas,
Denton,
Ellis,
Johnson,
Kaufman,
Parker,
Rockwall
and
Tarrant
Counties),
capacity
greater
than
or
equal
to
300
hp,
also
3.0
gram/
hp­
hr
for
CO.
See
117.206(
b)(
3)(
B)(
ii)

Affected
industrial,
commercial,
and
institutional
sources
in
the
D/
FW
ozone
nonattainment
area
will
need
to
comply
with
the
above
NOx
emissions
limits
per
compliance
schedule
outlined
in
117.520(
b)(
1)
and
117.520(
b)(
2).

The
schedule
in
117.520
establishes
time
frame
for
testing,
recording,
reporting,
CEMS
and
PEMS
performance
evaluations,
and
installation
of
appropriate
NOx
abatement
equipment
by
no
later
than
June
15,
2007.
Section
117.520
concerns
Compliance
Schedule
for
Industrial,
Commercial,
and
Institutional
Combustion
Sources
in
ozone
Nonattainment
Areas.
Section
117.520
will
make
the
proposed
SIP
revision
enforceable
and
should
be
given
approval.

Affected
industrial,
commercial,
and
institutional
sources
will
need
to
comply
with
the
5
Monitoring,
Recordkeeping,
and
Reporting
Requirements
outlined
in
117.479.
Section
117.479
will
make
the
proposed
SIP
revision
enforceable.
Section
117.479
should
be
given
approval.

Section
117.114
concerns
Emission
Testing
and
Monitoring
for
Houston­
Galveston
Attainment
Demonstration.
Equation
117.114(
a)(
4)(
A)
or
mass
balance
can
be
used
to
calculate
ammonia
emissions.

NH3
@
O2
=
[((
a
/
b)
x
10
6)
­
c]
x
d
where:
a
=
ammonia
injection
rate
(
in
pounds
per
hour
(
lb/
hr))/
17
pound
per
pound­
mole
(
lb/
lb­
mol)
b
=
dry
exhaust
flow
rate
(
lb/
hr)/
29
lb/
lb­
mol
c
=
change
in
measured
NOx
concentration
across
catalyst
(
ppmv
at
reference
oxygen)
d
=
correction
factor,
the
ratio
of
measured
slip
to
calculated
ammonia
slip,
where
the
measured
slip
is
obtained
from
the
stack
sampling
for
ammonia
required
by
§
117.111(
a)(
2)
of
this
title
(
relating
to
Initial
Demonstration
of
Compliance),
using
either
the
Phenol­
Nitroprusside
Method,
the
Indophenol
Method,
or
EPA
Conditional
Test
Method
27.
Minor
modifications
to
these
methods
or
EPA­
approved
alternative
test
methods
may
be
approved
by
the
executive
director,
as
specified
in
§
117.211(
e)(
6)
of
this
title
(
relating
to
Initial
Demonstration
of
Compliance).
[
Note:
Ammonia
tests
are
usually
based
on
the
Berthelot
reaction.
Ammonia
reacts
with
alkaline
phenol,
then
with
sodium
hypochlorite
to
form
indophenol
blue.
Sodium
nitroprusside
(
nitroferricyanide)
is
added
to
enhance
sensitivity.
The
absorbance
of
the
reaction
product
is
measured
at
630
nm,
and
is
directly
proportional
to
the
ammonia
concentration.]

The
correction
factor
"
d"
in
this
equation
allows
to
use
EPA
Test
Method
27
or
an
EPA
approved
alternative
test
method.
The
alternative
test
method
will
need
to
comply
with
the
specifications
outlined
in
117.211(
e)(
6).
Section
117.114
should
be
given
approval.

The
date
by
which
a
unit
be
shut
down
after
the
compliance
date
operating
without
the
required
CEMS
was
changed
from
May
31,
2005,
to
September
30,
2005.
This
extension
should
provide
for
flexibility
for
affected
sources
mainly
in
the
H/
GA
and
B/
PA
area.
This
extension
does
not
affect
the
attainment
demonstration
deadlines
for
the
nonattainment
areas
and
should
be
given
approval.

Section
117.214
concerns
Emission
Testing
and
Monitoring
for
the
Houston­
Galveston
Attainment
Demonstration.
Equation
117.214(
a)(
1)(
D)(
i)
or
mass
balance
can
be
used
to
calculate
ammonia
emissions.
Equation
117.214(
a)(
1)(
D)(
i)
is
similar
to
the
equation
117.114(
a)(
4)(
A);
however,
the
required
parts
per
million
by
volume
(
ppmv)
at
reference
oxygen
NH3
@
O2
is
different
for
each
source
category.
Reference
oxygen
on
a
dry
basis
is
3.0%
for
boilers
and
process
heaters;
0.0%
for
fluid
catalytic
cracking
units
(
including
CO
boilers,
CO
furnaces,
and
catalyst
regenerator
vents);
7.0%
for
boilers
and
industrial
furnaces
(
BIF
units)
that
were
regulated
as
existing
facilities
by
the
EPA
at
40
Code
of
Federal
Regulations
Part
266,
Subpart
H
(
as
was
in
effect
on
June
9,
1993),
wood­
fired
boilers,
and
incinerators;
15%
for
stationary
gas
turbines
(
including
duct
burners
used
in
turbine
exhaust
ducts),
gas­
fired
lean­
burn
6
engines,
and
lightweight
aggregate
kilns;
and
3.0%
for
all
other
units.
The
correction
factor
"
d"
in
this
equation
allows
to
use
EPA
Test
Method
27
or
an
EPA­
approved
alternative
test
method.
The
alternative
test
method
will
need
to
comply
with
the
specifications
outlined
in
117.211(
e)(
6).
Section
117.214
should
be
given
approval.

Section
117.201
concerns
Applicability
for
this
particular
SIP
revisions.
Sources
listed
in
117.201
(
1)
though
(
12)
are
all
combustion
sources
and
emit
NOx.
Revised
117.201(
5)
changes
the
word
"
EPA"
to
the
"
United
States
Environmental
Protection
Agency."
This
change
is
minor
and
editorial
in
nature,
and
has
been
adopted
to
comply
with
the
Texas
Register
publishing
requirements.
Section
117.201
should
be
given
approval.

Section
117.203
concerns
Exemptions
and
clarifies
that
co­
gen
boilers
that
recover
heat
from
one
or
more
carbon
black
reactors
in
the
B/
PA
area
will
not
subject
to
this
SIP
revision.
The
EPA
commented
on
this
subject
to
the
State
during
public
comment
period
.
See
comment
#
3
in
Table
E
of
this
attachment.
We
have
evaluated
State's
response
and
find
State's
response
in
Table
E
satisfactory;
therefore,
section
117.203
should
be
given
approval.

Section
117.213
concerns
Continuous
Demonstration
of
Compliance.
Section
117.213(
a)(
2)(
B)
states
that
units
venting
to
a
common
stack
with
a
NO
and
diluent
CEMS
may
use
a
single
totalizing
fuel
flow
meter.
The
CEMS
requirements
are
in
section
117.213(
e).
The
CEMS
will
need
to
meet
the
requirements
of
40
CFR
60.13,
40
CFR
60
Appendix
B,
and
Performance
Specifications
2
through
5
of
that
Appendix.
The
CEMS
will
need
to
meet
the
requirements
of
40
CFR
Par
75
as
well.
Section
117.213
should
be
given
approval.

In
addition,
in
the
January
6,
2005
comment
letter
to
the
TCEQ
we
wrote
:
"
Thank
you
for
the
opportunity
to
review
....
our
comments
are
as
follows:"
[
see
Table
E
below]

Table
E
­
Tabulated
summary
of
EPA
comments
on
the
proposed
rulemaking
to
Texas
7
EPA
Comment
State
Response
Acceptable
1)
Although
this
project
is
being
proposed
as
a
part
of
the
5%
Increment
of
Progress
for
the
Dallas/
Fort
Worth
ozone
nonattainment
area,
the
proposed
section
117.203(
a)(
13)
introduces
a
new
exemption
for
a
certain
category
of
sources
in
the
Beaumont
Port
Arthur
ozone
nonattainment
area.
Please
elaborate
which
facilities
are
affected
by
this
new
exemption,
and
how
much
(
tons
per
day
or
tons
per
year)
the
NOx
emissions
from
these
exempted
facilities
are.
The
emission
reductions
necessary
for
the
B/
PA
attainment
demonstration
SIP
were
based
on
the
modeling
episode
from
September
6,
1993
­
September
11,
1993,
and
the
controlling
day,
September
10,
1993.
Modeling
for
the
controlling
day
indicated
that
a
point
source
NOx
reduction
of
approximately
40%
from
1997
levels,
or
about
60
tons
per
day,
was
necessary.
Staff
analyzed
the
most
recent
available
point
source
NOx
emissions
inventory,
which
was
1997.
Emission
specifications
to
achieve
the
necessary
reductions
were
developed
for
the
four
largest
of
the
source
categories:
industrial
boilers,
process
heaters,
electric
utility
boilers,
and
engines.
This
exemption
is
added
because
it
was
not
the
commission's
intent
that
these
units
be
subject
to
Chapter
117,
Subchapter
B,
Division
3.
This
exemption
does
not
impact
the
B/
PA
area
SIP
demonstration
because
NOx
reductions
from
these
units
are
not
included
in
the
attainment
demonstration.
Thus,
there
will
be
no
emissions
increases
or
decreases
associated
with
the
SIP
with
the
addition
of
this
exemption.
The
commission
will
continue
to
analyze
emissions
inventories
for
future
attainment
demonstrations
and
determine
what
reductions
may
or
may
not
be
necessary
or
achievable.
Yes
2)
The
proposed
section
117.206(
b)(
2)
sets
forth
emission
limitation
for
NOx
and
a
companion
emission
limitation
for
carbon
monoxide
(
CO)
from
gasfired
and
dual­
fired
lean­
burn
IC
engines.
As
you
are
aware
emissions
of
NOx
and
CO
from
IC
engines
are
interdependent.
This
multi­
pollutant
approach
will
promote
better
housekeeping,
maintenance,
and
operation
of
the
affected
engines
by
the
operator.
The
Air
Planning
Section
supports
this
multi­
pollutant
approach
in
117.206(
b)(
2).
[
EPA
comment
#
2
is
merely
a
statement
of
support
and
TCEQ
is
not
obligated
to
respond]
Yes
EPA
Comment
State
Response
Acceptable
8
3)
The
proposed
section
117.206(
b)(
3)
sets
forth
a
new
emission
limitation,
for
lean­
burn
and
rich­
burn
engines,
for
NOx
alone.
We
recommend
section
117.206(
b)(
3)
to
include
an
appropriate
companion
CO
limit
for
these
engines
as
well.
Consequently,
sections
117.206(
b)(
2)
and
117.206(
b)(
3)
both
will
become
consistent
in
approach
and
methodology.
It
was
the
intent
of
the
commission
that
units
subject
to
§
117.206(
b)(
3)
be
subject
to
the
3.0
g
CO/
hp­
hr
emission
specification
in
§
117.205(
d)
or
§
117.206(
b)(
2).
However,
the
proposed
applicability
section,
§
117.201,
inadvertently
exempted
engines
in
Ellis,
Johnson,
Kaufman,
Parker,
and
Rockwall
Counties
from
the
CO
limit
specified
in
§
117.205(
d)
or
§
117.206(
b)(
2).
Therefore,
the
commission
has
revised
§
117.206(
b)(
3)
to
include
the
3.0
g/
hp­
hr
CO
emission
specification.
Yes
A
comparison
of
NOx
emissions
limitations
in
Table
E
vs.
Table
D
of
this
attachment
reveals
that
the
proposed
NOx
emissions
limitations:
a)
are
more
stringent,
b)
include
additional
engine
categories
(
rich­
burn
and
dual­
fired
IC
engines),
c)
affect
five
more
counties
(
total
of
9
counties)
not
previously
included,
and
d)
result
in
additional
NOx
reductions
not
available
under
previous
regulations.
These
additional
NOx
reductions
will
assist
in
bringing
the
D/
FW
area
into
compliance
with
the
applicable
ozone
standards.
The
proposed
revisions
to
the
Texas
SIP
are
in
conformance
with
sections
110
and
116
of
the
Act.

For
these
reasons,
the
proposed
revisions
to
30
TAC
Chapter
117,
as
submitted
to
us
with
a
letter
dated
May
13,
2005,
should
be
given
approval.
9
Example
of
Conversion
of
Gram/
hp­
hr
to
parts
per
million
(
ppm)
for
IC
Engines:

For
Carbon
monoxide
(
CO):
IC
engines
emission
rate
calculator
Formula
inputs:
Pollutant
concentration:
1177ppm
Generator
efficiency:
36%
O
2
in
exhaust
stream:
3%
(
Usually
15%
for
internal
combustion
engines)

Calculated
results:
Heat
rate,
mmBtu/
MW:
9.5
Emission
rates,
g/
hp­
h:
Gas
Diesel
Wood
Coal
NO
2
:
4.92
5.20
5.22
5.53
SO
2
:
6.86
7.24
7.28
7.70
6CO:
3.00
3.16
3.18
3.37
NMOGs:
4.72
4.98
5.01
5.30
For
Oxides
of
Nitrogen
(
NOx):
IC
engines
emission
rate
calculator
Formula
inputs:
Pollutant
concentration:
120ppm
Generator
efficiency:
36%
O
2
in
exhaust
stream:
3%
(
Usually
15%
for
internal
combustion
engines)

Calculated
results:
Heat
rate,
mmBtu/
MW:
9.5
Emission
rates,
g/
hp­
h:
Gas
Diesel
Wood
Coal
6NO
2
:
0.50
0.53
0.53
0.56
SO
2
:
0.70
0.74
0.74
0.79
CO:
0.31
0.32
0.32
0.34
NMOGs:
0.48
0.51
0.51
0.54
