This chapter summarizes emissions occurring in the Basin during
the base years 1987, 1990, and 1993, and projected emissions in
the years 2000, 2006, 2010. More detailed emission data analyses
are presented in Appendix III of the 1997 AQMP. Additional emission
inventories for other interim years (i.e., 1997, 1999, 2002, 2003,
2005, 2007, 2008) are also developed. These inventory years are
selected to comply with federal and state Clean Air Act requirements.
Under the federal and state Clean Air Acts, the District is required
to report the Basin's emission reduction progress for nonattainment
pollutants. The base year to measure the Basin's progress is 1990
for both the federal and state Clean Air Acts. A 1987 and a 1990
emission inventory were reconstructed to reflect the most recent
inventory methodologies. Adopted air quality rules and regulations
have current and future compliance dates. The 1993 base year emissions
inventory reflects adopted air regulations with current compliance
dates; whereas future baseline emissions inventories are based
on adopted air regulations with both current and future compliance
dates. A list of District rules and regulations that are part
of the base year and future-year baseline emissions inventories
is presented in Appendix III. Some of these rules have not been
approved by U.S. EPA, however the District is committed to implement
these rules that are incorporated in the 1997 AQMP baseline emissions
inventories.
The emissions inventory is divided into four major classifications:
point, area, off-road, and on-road sources. The 1993 base year
point source emissions are based principally on reported data
from facilities. The area source and off-road emissions are estimated
jointly by ARB and the District. The on-road emissions are calculated
using the ARB EMFAC7G emission factors and the transportation
activity data provided by SCAG. The 1987 and 1990 inventories
were reconstructed/backcasted based on the same general methodology
as the 1993 inventory so as to reflect current knowledge. For
example, EMFAC7G was applied to the 1987 and 1990 vehicle activity
data to backcast 1987 and 1990 on-road mobile emissions. This
approach provides a more consistent basis for evaluation of emission
reduction progress.
The future emission forecasts are based on demographic and economic
growth projections provided by the Southern California Association
of Governments (SCAG). The California Energy Commission (CEC)
energy forecasts for the petroleum industry and gas appliance-related
categories incorporating energy efficiency standards are also
used to refine emission projections. In addition, emission reductions
resulting from ARB and District regulations adopted by September
30, 1996 are included in the emission forecasts. The rules and
regulations adopted beginning in 1996 are treated as baseline
adjustment measures to account for their emissions impacts.
Baseline emissions data presented in this chapter are based on
average annual day emissions (i.e., total annual emissions divided
by 365 days) and seasonally adjusted planning inventory emissions.
The 1997 AQMP uses annual average day emissions to estimate the
cost-effectiveness of a control measure, to rank control measure
implementation, and to perform PM10 modeling and analysis. Theplanning inventory emissions developed to capture the emission
levels during the poor air quality season are used to report emission
reduction progress as required by the federal and state Clean
Air Acts. Three planning inventories are prepared for the 1997
AQMP: an ozone inventory for summer volatile organic compounds
(VOC) and oxides of nitrogen (NOx) emissions; a carbon monoxide
(CO) inventory for winter CO emissions; and a nitrogen dioxide
(NO2) inventory for winter NOx emissions. In addition, the most
recent U.S. EPA VOC definition (i.e., exclusion of acetone, ethane,
and PERC) is applied for the purpose of AQMP inventory development.
Detailed descriptions of the base year and future baseline emission
inventories are presented in Appendix III - Base Year and Future
Year Emission Inventories.
Stationary
Sources
Stationary sources can be divided into two major subcategories:
point and area sources. Point sources are generally large emitters
with one or more emission sources at a permitted facility with
an identified location (e.g., power plants, refinery boilers).
Area sources generally consist of many small emission sources
(e.g., residential water heaters, architectural coatings) which
are distributed across the region. Their emissions over a given
area may be calculated using socioeconomic data. For 1987, reported
data is used for point sources emitting more than 8 tons/year
of any one of the criteria air contaminants and the District's
permit system data base is relied upon to estimate emissions for
smaller sources; for 1990 and 1993, reported data is used for
facilities with emissions greater than or equal to 2 tons/year.
Area source emissions were jointly developed by the ARB and the
District for a total of more than 200 categories. Several special
studies were conducted to improve the area source inventory. ARB
has recently completed a statewide inventory for degreasing operations
identifying solvent cleaning emissions not previously inventoried.
In addition, the most recent source test data for restaurant operations
(e.g., charbroiler and deep fryers) was used for the 1997 Plan.
Finally, significant progress has been made since the adoption
of the 1994 AQMP to improve PM10 fugitive dust and ammonia emission
inventories. The following sections summarize the progress and
the results for a variety of projects related to emission inventory
improvement.
Fugitive Dust and Ammonia Inventory Updates
As part of the 1994 AQMP process, it was recognized that the fugitive
dust and ammonia inventories should be reviewed and revised, if
necessary, prior to the development of the 1997 AQMP. Since that
time, the District has participated in a number of fugitive dust
and ammonia emission projects, as well as following projects by
other sponsors. Based on the results of these studies and more
recent activity level information, the District has prepared updated
1993 fugitive dust and ammonia emission inventories.
Best Available Control Measure (BACM) Working Group
The District, through the cooperative efforts of the BACM Working
Group, embarked on an accelerated program to correct previously
identified fugitive dust inventory deficiencies. The BACM Working
Group is an ongoing task force comprised of representatives from
U.S. EPA Region IX, ARB, South Coast AQMD, San Joaquin Valley
APCD, Great Basin APCD, Mojave Desert AQMD, Clark County Nevada,
Washoe County Nevada, Maricopa County Arizona, Arizona Department
of Environmental Quality, USDA Soil Conservation Service, Coachella
Valley Association of Governments, and WESTAR (Western States
Air Resource Council). The emission inventory projects included
studies aimed at improving emission factors for such fugitive
dust sources as paved roads and construction, as well as quantifying
previously uninventoried sources. Emission factors for entrained
paved road dust and construction were significantly lower thanprevious estimates based on these studies. Previously uninventoried
sources, such as entrained leaf blower and unpaved shoulder dust,
were generally found to be small contributors to the overall inventory.
PM10 Technical Enhancement Program (PTEP)
The results from three emission inventory projects from the District's
PM10 Technical Enhancement Program (PTEP) have been used to revise
the fugitive dust and ammonia inventories. The Fugitive Dust Integration
project summarized previous inventory development and current
and past emission factor studies. It also provided recommendations
for the best available emission methodology, emission factors,
and activity estimates for each fugitive dust category. These
recommendations were used by District staff in the development
of the fugitive dust inventory. A second PTEP project was the
development of a Geographic Information System (GIS) to prepare
spatially-resolved fugitive dust inventories. Spatially-resolved
1993 construction dust emissions have been prepared for the 1997
AQMP.
A separate PTEP project measured emissions from livestock waste
at local dairies, since it was believed that current local dairy
operations were significantly different than those used to derive
previous emission estimates. Results from this study indicated
that the emission factor for local dairy waste was approximately
70% less than the factor used in previous emission inventory estimates,
since earlier studies were not based on local area conditions.
Updated 1993 Fugitive Dust and Ammonia Inventories
Activity levels for all sources were updated to the 1993 base
year, which reflects the impact of the local economic activities
as well as Rule 403 on construction emissions. Overall, updated
emission factors and activity levels for several categories led
to a 54% reduction in fugitive dust emission estimates. Figure
3-1 compares the changes in fugitive dust inventories between
1994 and the 1997 Plans.
FIGURE 3-1
1993 Fugitive Dust Inventory for the 1994 AQMP and the 1997 AQMP
The 1993 livestock waste ammonia inventory is approximately 50%
less than the 1987 emission estimate used in previous plans. The
reduction results from the reduced emission factor for dairy livestock
waste and the 1993 animal population statistics, which showed
a decrease in poultry from the 1987 levels. It should also be
noted that previous ammonia emission estimates for wastewater
treatment plants were overstated compared to the ammonia emissions
reported in the AB 2588-required Air Toxics Inventory Report and
from source testing. Based on this and other information, 1993
ammonia emission estimates for wastewater treatment plants are
now calculated to be 100 times smaller than previous estimates.
Mobile
Sources
Mobile sources consist of two subcategories: on-road and off-road
sources. On-road vehicle emissions are calculated using socioeconomic
data and transportation models provided by SCAG, spatial distribution
data from Caltrans' Direct Travel Impact Model (DTIM), and emission
factors (EMFAC7G) obtained from the ARB. The 1990 Census data
is reflected in the SCAG socioeconomic data, and the 1991 origin
and designation survey data is used in the SCAG transportation
model. Major improvements made to EMFAC7G include:
- Redefining starts and redistributing starts by vehicle age;
- New start emissions methodology;
- Fuel corrections for diesel;
- High emitter adjustments;
- Driving cycle adjustments; and
- Implementation of adopted rules (e.g., enhanced inspection
and maintenance program, 4.0 gram NOx standards for heavy-duty
diesel trucks and urban diesel buses, and 2.5 gram NOx standard
for heavy-duty gas trucks).
Based on the vehicle activity data and EMFAC, an upgraded DTIM
model (i.e., DTIM2) is used to estimate on-road mobile emissions.
Figure 3-2 compares the on-road emissions between EMFAC7F and
EMFAC7G.
Emissions from off-road vehicle categories (e.g., trains, ships,
utility engines) were developed primarily based on the estimated
activity levels and emission factors. A special study was conducted
by ARB to improve the emission estimates for pleasure craft. A
separate study to inventory ship emissions was recently completed
and the emission estimates from that study have been incorporated
into the 1997 AQMP
Gridded Emissions
For air quality modeling purposes, the region is composed of the
South Coast Air Basin, Coachella Valley, Antelope Valley, Ventura
County (upwind area), and Mojave Desert. The modeling area is
divided into a grid system composed of 5 km by 5 km grid cells
defined by Universal Transverse Mercator (UTM) coordinates. Both
stationary and mobile emissions are allocated to individual grid
cells within this system. In general, the modeling emission data
features episodic-day emissions. Seasonal variations in activity
levels are taken into account in developing gridded stationary
point and area source emissions. Variations in temperature, hours
of operation, speed of motor vehicles, or other factors are considered
in developing gridded motor vehicle emissions. Hence, "gridded"
emissions data used for ozone modeling applications (Chapter 5)
differ from the average annual day or planning inventory emission
data in two respects: 1) the modeling region covers larger geographic
areas than the Basin; and 2) emissions represent day-specific
instead of average or seasonal conditions. In the 1997 AQMP, gridded
inventories associated with four ozone and two PM10 episodes have
been prepared for air quality modeling analyses. In addition,
gridded emissions for 1995 were developed to calculate annual
average PM10 concentrations.
FIGURE 3-2
Comparison of Emissions Between EMFAC7F and EMFAC7G
(From information provided by the California Air Resources Board
- December 1995 Release)
BASE
YEAR EMISSIONS
Reconstructed
1987 and 1990 Emission Inventories
The federal and state Clean Air Acts have specified the 1987 and
1990 emission inventories, respectively, as the baseline for measuring
emission reduction progress. Therefore, inventories for both years
have been revised since the adoption of the 1994 AQMP to reflect
improvements in emissions estimates and inventory methodology;
this provides a consistent basis for emission trend analysis.
Most noticeably, a significant change in methodology has been
made to on-road and PM10 categories. Tables 3-1 and 3-2 present
the reconstructed 1987 and 1990 emissions by major source category
for the criteria pollutants VOC, NOx, SOx, CO, and PM10.
1993
Emission Inventory
Table 3-3 shows the 1993 emission inventory. Figure 3-3 characterizes
relative contributions by stationary and mobile source categories.
Stationary sources are subdivided into point (e.g., chemical manufacturing,
petroleum production, and electric utilities) and area sources
(e.g., architectural coatings, residential water heaters, and
consumer products). Mobile sources consist of on-road (e.g., light-duty
passenger cars) and off-road sources (e.g., trains and ships).
Overall, total mobile source emissions account for 61 percent
of the VOC and 88 percent of the NOx emissions for these two ozone-forming
pollutants. The on-road mobile category alone contributes about
51 and 63 percent of the VOC and NOx emissions, respectively and
approximately 78 percent of the CO.
Within stationary sources, point sources contribute more NOx and
SOx emissions than area sources. However, area sources play a
major role in VOC emissions, emitting about two to three times
more than point sources. Furthermore, area sources are the predominant
source (87 percent) of PM10 emissions due to inclusion of travel-related
activity.
TABLE 3-1A
Summary of Emissions By Major Source Category: 1987 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 12 210 72 14 12
Waste Burning 2 2 17 1 3
Solvent Use 520 1 0 0 2
Petroleum Process, 105 8 6 19 3
Storage, & Transfer
Industrial Processes 27 8 3 6 29
Misc. Processes* 40 8 13 1 408
Total Stationary 706 237 111 41 457
Sources
Mobile Sources
On-Road Vehicles 988 772 6,931 35 26
Off-Road Vehicles 124 294 1,363 49 19
Total Mobile Sources 1,112 1,066 8,294 84 45
TOTAL 1,818 1,303 8,405 125 502
TABLE 3-1B
Summary of Emissions By Major Source Category: 1987 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 12 211 226 86
Waste Burning 1 2 3 33
Solvent Use 611 1 1 0
Petroleum Process, Storage, & 105 8 8 6
Transfer
Industrial Processes 39 9 8 3
Misc. Processes 46 10 10 14
Total Stationary Sources 814 241 256 142
Mobile Sources
On-Road Vehicles 944 750 801 7,616
Off-Road Vehicles 151 361 358 1,651
Total Mobile Sources 1,095 1,111 1,159 9,267
TOTAL 1,909 1,351 1,415 9,409
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
TABLE 3-2A
Summary of Emissions By Major Source Category: 1990 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 12 193 97 19 15
Waste Burning 2 2 19 0 2
Solvent Use 474 1 0 0 1
Petroleum Process, Storage, 109 5 4 12 3
& Transfer
Industrial Processes 30 7 3 5 29
Misc. Processes* 31 1 8 0 397
Total Stationary Sources 658 209 131 36 447
Mobile Sources
On-Road Vehicles 863 891 6,679 34 39
Off-Road Vehicles 127 313 1,413 34 20
Total Mobile Sources 990 1,204 8,092 68 59
TOTAL 1,648 1,413 8,223 104 506
TABLE 3-2B
Summary of Emissions By Major Source Category: 1990 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS*
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 14 202 215 120
Waste Burning 1 2 3 35
Solvent Use 547 1 1 1
Petroleum Process, Storage, & 110 5 5 5
Transfer
Industrial Processes 40 8 8 3
Misc. Processes 33 2 2 9
Total Stationary Sources 745 220 234 173
Mobile Sources
On-Road Vehicles 833 868 921 7,381
Off-Road Vehicles 155 384 382 1,723
Total Mobile Sources 988 1,252 1,303 9,104
TOTAL 1,733 1,472 1,537 9,277
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
TABLE 3-3A
Summary of Emissions By Major Source Category: 1993 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 11 136 65 8 10
Waste Burning 1 3 17 2 2
Solvent Use 331 0 0 0 1
Petroleum Process, Storage, 58 8 5 11 2
& Transfer
Industrial Processes 17 6 1 2 20
Misc. Processes* 32 1 11 0 344
Total Stationary Sources 450 154 99 23 379
Mobile Sources
On-Road Vehicles 676 794 5,682 25 27
Off-Road Vehicles 114 246 1,264 31 15
Total Mobile Sources 790 1,040 6,946 56 42
TOTAL 1,240 1,194 7,045 79 421
TABLE 3-3B
Summary of Emissions By Major Source Category: 1993 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS*
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 11 135 149 76
Waste Burning 1 2 4 34
Solvent Use 364 0 0 0
Petroleum Process, Storage, & 59 8 8 5
Transfer
Industrial Processes 22 6 6 1
Misc. Processes 34 1 1 11
Total Stationary Sources 491 152 168 127
Mobile Sources
On-Road Vehicles 648 775 822 5,908
Off-Road Vehicles 138 296 294 1,538
Total Mobile Sources 786 1,071 1,116 7,446
TOTAL 1,277 1,223 1,284 7,573
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
FIGURE 3-3
Relative Contribution By Source Category to the 1993 Inventory
In the mobile source category, emissions from on-road vehicles
are much higher than those from off-road sources for all criteria
pollutants except SOx. This can be explained by the fact that
the sulfur content in fuels used for off-road vehicles is relatively
higher than those for on-road vehicles.
Figure 3-4 compares the 1993 inventory with the reconstructed
1987 and 1990 inventories. As can be seen, slight emission reductions
are shown for all stationary source pollutants due to adopted
air regulations. Existing ARB vehicle regulations result in reductions
in VOC and CO. The noticeable increase in NOx emissions between
1987 and 1990 is due to the shift to 1990 census data as well
as the estimated increase in heavy-duty vehicle VMTs.
*CO Emission values were divided by 10.
FIGURE 3-4
Comparison of Reconstructed 1987, 1990 Inventories and 1993 Inventory
Data
Development
The milestone years 1996, 1997, 1999, 2000, 2002, 2003, 2005,
2006, 2007, 2008, and 2010 are the target years for emissions
rate-of-progress estimates under the federal Clean Air Act and
the state Clean Air Act. In addition, an emissions inventory for
the year 2020 is also prepared for the first time to form the
basis for a first look at the air quality once the region attains
the federal clean air standards. Due to the adoption of the NOx
and SOx RECLAIM program in October 1993, future emissions are
divided into RECLAIM and non-RECLAIM emissions. Future NOx and
SOx emissions from RECLAIM sources are estimated based on their
initial allocations as specified by District Rule 2002. The revised
allocations for the six source categories as part of District
Rule 2015 technology review are incorporated in the RECLAIM emission
forecast. The forecasts for non-RECLAIM emissions were derived
using: 1) emissions from the 1993 base year; 2) expected controls
after implementation of District and ARB rules adopted by September
30, 1996; and 3) emissions growth in various source categories
between the base and future years. Rules adopted after September
30, 1996 are treated as baseline adjustment measures for emissions
reduction accounting purposes. A detailed description of the forecasting
methodology is provided in Appendix III of the 1997 AQMP.
Demographic growth forecasts for various socioeconomic categories
(e.g., population, housing, employment by industries), developed
by SCAG, were used to estimate future emissions. The 1990 Census
data were used to validate the 1990 socioeconomic data and future
growth. Industry growth factors for 2000, 2005, 2010, 2015 and
2020 were provided by SCAG. Growth factors for other interim years
were interpolated between key forecast years. CEC-adopted energy
efficiency standards and energy-based forecasts for the petroleum
industry are also used to improve emission forecasts for certain
gas appliance and refinery operation related categories. Table
3-4 summarizes key socioeconomic parameters used in the 1997 AQMP
for emissions inventory development.
TABLE 3-4
Baseline Socioeconomic Forecasts Used in 1997 AQMP*
Category 1993 2000 (% Growth) 2010 (% Growth)
Population 13.8 14.8 (+7) 16.7 (+21)
(Millions)
Housing Units 4.8 5.1 (+6) 5.7 (+19)
(Millions)
Total 6.0 6.7 (+12) 8.0 (+33)
Employment
(Millions)
Daily VMT 293.3 317.9 (+8) 377.9 (+29)
Daily Vehicle 31.2 33.2 (+6) 37.9 (+21)
Trips
(Millions)
* No AQMP measures included.
Current forecasts indicate that this region will experience a
population growth of 21 percent by the year 2010 with a 29 percent
increase in vehicle miles traveled (VMT). The current projection
for the year 2010 shows about half a million decrease in population
and a 36-million mile decrease in VMT forecast as compared to
the projection from the 1994 AQMP. The differences in the forecasts
are primarily due to the change in base year from 1990 to 1993.
Summary
of Baseline Emissions
Emission data by source categories (point, area, on-road mobile
and off-road mobile sources) and by pollutants are presented in
Tables 3-5 through 3-7 for the years 2000, 2006, and 2010.
Without any additional controls, VOC, NOx, and CO emissions are
expected to decrease due to existing regulations, such as the
LEV and oxygenated fuel programs, and the RECLAIM program. Figure
3-5 illustrates the relative contribution to the 2010 inventory
by source category. A comparison between Figures 3-3 and 3-5 indicates
that the on-road mobile category continues to be a major contributor
to CO and NOx emissions. However, due to the adopted LEV regulation,
by 2010 on-road mobile accounts for about 19 percent of total
VOC emissions compared to 51 percent in 1993. Meanwhile, area
sources become the major contributor to VOC emissions from 30
percent in 1993 to 48 percent in 2010.
TABLE 3-5A
Summary of Emissions By Major Source Category: 2000 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 10 64 64 2 9
Waste Burning 6 5 91 0 11
Solvent Use 316 0 0 0 1
Petroleum Process, Storage, & 45 0 5 0 2
Transfer
Industrial Processes 20 0 1 0 23
Misc. Processes* 32 1 11 0 364
RECLAIM Source NA 43 NA 16 NA
Total Stationary Sources 429 113 172 18 410
Mobile Sources
On-Road Vehicles 350 521 2,963 14 16
Off-Road Vehicles 112 248 1,270 34 15
Total Mobile Sources 462 769 4,233 48 31
TOTAL 891 882 4,405 66 441
TABLE 3-5B
Summary of Emissions By Major Source Category: 2000 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS*
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 10 60 72 77
Waste Burning 3 3 12 200
Solvent Use 348 0 0 0
Petroleum Process, Storage, 46 0 0 5
& Transfer
Industrial Processes 27 0 0 1
Misc. Processes 34 1 1 12
RECLAIM Source NA 45 45 NA
Total Stationary Sources 468 109 130 295
Mobile Sources
On-Road Vehicles 334 509 535 3,298
Off-Road Vehicles 135 298 295 1,549
Total Mobile Sources 469 807 830 4,847
TOTAL 937 916 960 5,142
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
TABLE 3-6A
Summary of Emissions By Major Source Category: 2006 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 10 65 71 2 10
Waste Burning 7 6 102 0 12
Solvent Use 340 0 0 0 1
Petroleum Process, Storage, 46 0 5 0 2
& Transfer
Industrial Processes 23 0 1 0 23
Misc. Processes* 33 1 12 0 376
RECLAIM Source NA 32 NA 11 NA
Total Stationary Sources 459 104 191 13 424
Mobile Sources
On-Road Vehicles 222 403 2,103 16 14
Off-Road Vehicles 120 231 1,363 37 16
Total Mobile Sources 342 634 3,466 53 30
TOTAL 801 738 3,657 66 454
TABLE 3-6B
Summary of Emissions By Major Source Category: 2006 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS*
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 11 60 73 85
Waste Burning 4 4 13 227
Solvent Use 374 0 0 0
Petroleum Process, Storage, & 46 0 0 5
Transfer
Industrial Processes 31 0 0 1
Misc. Processes 35 1 1 13
RECLAIM Source NA 33 33 NA
Total Stationary Sources 501 98 120 331
Mobile Sources
On-Road Vehicles 217 396 413 2,274
Off-Road Vehicles 145 274 271 1,655
Total Mobile Sources 362 670 684 3,929
TOTAL 863 768 804 4,260
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
TABLE 3-7A
Summary of Emissions By Major Source Category: 2010 Base Year
Average Annual Day (tons/day1)
Source Category VOC NOx CO SOx PM10
Stationary Sources
Fuel Combustion 11 65 75 2 10
Waste Burning 7 6 102 0 12
Solvent Use 362 0 0 0 1
Petroleum Process, Storage, 46 0 5 0 3
& Transfer
Industrial Processes 26 0 1 0 24
Misc. Processes* 34 1 13 0 383
RECLAIM Source NA 32 NA 11 NA
Total Stationary Sources 486 104 196 13 433
Mobile Sources
On-Road Vehicles 165 365 1,810 17 14
Off-Road Vehicles 119 228 1,335 40 16
Total Mobile Sources 284 593 3,145 57 30
TOTAL 770 697 3,341 70 463
TABLE 3-7B
Summary of Emissions By Major Source Category: 2010 Base Year
Planning Inventory** (tons/day1)
SUMMER WINTER
OZONE PRECURSORS PRECURSORS*
Source Category VOC NOx NOx CO
Stationary Sources
Fuel Combustion 11 60 72 91
Waste Burning 4 4 13 227
Solvent Use 400 0 1 0
Petroleum Process, Storage, & 47 0 0 5
Transfer
Industrial Processes 33 0 0 1
Misc. Processes 36 1 1 13
RECLAIM Source NA 33 33 NA
Total Stationary Sources 531 98 120 337
Mobile Sources
On-Road Vehicles 163 360 373 1,913
Off-Road Vehicles 145 269 266 1,643
Total Mobile Sources 308 629 639 3,556
TOTAL 839 727 759 3,893
* Travel related road dust included **Planning inventories are
not used for PM10 analysis
1 Values are rounded to nearest integer
FIGURE 3-5
Relative Contribution By Source Category to the 2010 Inventory
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