ALL THINGS ARE UNCERTAIN ... EVEN EMISSION FACTORS!

EIB is continuing a study of the uncertainty in emission
factors. Historically, factor uncertainties have been addressed
by assigning each factor a subjective quality rating, ranging
from "A" to "E". While this system has served well over the
years, current developments in emission factor use keep
asking for a rating system that gives the user a clearer idea of
the quality or the uncertainty of AP-42 factors. For
example, instead of rating a process emission factor "A",
we might have enough information about the process to rate
the factor "A (+ 25%)".

Originally, the purpose of AP-42 emission factors was to
estimate total annual emissions from a large group of
facilities, and thence the quality rating criteria were
developed. Because evolving environmental regulations and
policies are expanding the need for emission estimates, we
find that these emission factors are frequently used to develop
estimates for single facilities over short time periods, often
under atypical operating conditions. Also, rather than being
applied as a large-scale planning tool, emission factors are
now used to develop permit limits, to generate emission
statements for individual sources, and to develop regulations
for relatively small nonattainment areas. A quantitative
estimate is needed of the uncertainty (inaccuracy and/or

imprecision) of these emission factors to clarify their quality
when used in these emerging applications.

In real situations, many industries have asked for emission
factors that range over the wide variations in their processes
rather than for single values that cloud that variability.
Also, some individuals have asked for the high or low end of
the range of measured value to be included in an operating
permit. Other people have asked, "How reliable is the
emission factor?", wanting to know how confident we are
that the assigned value is the true average.

At this time, we would expect that only a few of our "A"
rated factors are supported by a large enough number of
emission tests to allow for this new expanded rating system.
There are just not enough data on whole source categories.
Nevertheless, our study will be looking for ways to estimate
the uncertainty of the factors.

We are asking you, the community of AP-42 emission
factor users, to give us your thoughts on such a new rating
system. More importantly, we want to know what kinds of
emission information will satisfy your needs (other than the
present single value that represents an average). If you have
thoughts or suggestions on this topic, please contact Ron
Myers at the Newsletter, (919) 541-5407, or send him a
message on the CHIEF BB. «

RAMP:
THE RUSSIAN AIR MANAGEMENT PROGRAM

The Office Of Air Quality Planning And Standards
(OAQPS) has begun working with the Russian Ministry Of
Environmental Protection And Natural Resources to explore
alternative ways of approaching air quality management in
Russia. This cooperative effort, the RUSSIAN AIR
MANAGEMENT PROGRAM (RAMP), will emphasize helping
the Russians decide “what to do" and “how to do it" in
working toward air quality, and not deciding or doing it for
them. The RAMP approach will be one of people helping
people, with substantial involvement from OAQPS air
policy and technical people, as well as experts from the EPA
Regions and state agencies. RAMP is being overseen by a
Management team comprising EPA Program Manager
Thompson G. Pace of OAQPS, representatives of the
Russian Ministry, St. Petersburg's Scientific Research
Institute Of Atmospheric Air Protection, and the City Of
Volgograd Environmental Services Administration (VESA).

The RAMP team will advise and assist in (1) assessing
and ranking Russian air pollution problem areas, (2)
demonstrating specific alternatives to the current air quality
management system through a pilot program in Volgograd,
and (3) strengthening their federal air quality management
capabilities. Thus, RAMP is to be a comprehensive project,

helping the Russians to set priorities and to strengthen
federal legislation, programs and policies.

Volgograd was chosen by all participants for the pilot city
effort, because of its progressive and environmentally
enlightened local government, diverse industrial base, and
relatively healthy economy.

Through RAMP, EPA's Technical Support Division will
directly assist the Russians as they evaluate their emission
factors and inventory methods. Pending approval by the
Russians, RAMP plans to:

— Determine the basis of emission factors and estimation
methods used in Russia

~ Review the current Russian national inventory (sources,
methods, completeness)

— Define future emission inventory needs and users

~ Review inventory quality assurance procedures

— Assess emission factors and inventory procedures and
guidance, and revise as appropriate

— Evaluate the Volgograd inventory and revise procedures
to produce an inventory usable for dispersion modeling.

For more information about RAMP, contact Tom Pace, at
(919) 541-5634; or David Misenheimer, at the Newsletter,
(919) 541-5473.


THE EMISSION INVENTORY BRANCH

J. David Mobley, Chief
(919) 541-4676
Sherry Russell, Secy.

EMISSION FACTOR AND INVENTORY GUIDANCE AND
METHODOLOGIES SECTION EVALUATION SECTION
Jim Southerland, Chief David Misenheimer, Acting Chief
(919) 541-5522 (919) 541-0875

Dennis Beauregard (on rotational assignment) Steve Bromberg.
Michael Hamlin Lee Gabele
Whit Joyner Bill Kuykendal
Joe McSorley Tom McMullen
Ron Myers Sharon Nizich
Anne Pope (7am - 2pm) Mary Ann Warner-Selph
Ron Ryan Susan Curtis, Secy.
Dallas Safriet

Dennis Shipman
Mary Taborn, Secy.



EIB OFFERS COURSES ON EMISSION ESTIMATION

The Emission Inventory Branch (EIB) is using new high technology in offering several hands-on emission estimation
courses this Spring. The courses will cover tools such as the Air CHIEF CD-ROM, the FIRE factor data base, and the
TANKS pc calculation program, and will deal with using the CHIEF electronic bulletin board. The courses, sponsored by the
Air And Waste Management Association (AWMA), will be distributed by satellite from EPA's Air Pollution Training
Institute (APTI) and will be presented at two EPA Regions or state agencies.

The satellite courses will be presented on a two-way network in which live courses can be downloaded to EPA Regional
Offices and to 60 state/local agencies. Participants will receive EIB tools and materials before the courses begin. Any
questions that arise during the courses may be called in on an 800 number. Industry can participate in the courses by satellite
transmission linking. We encourage you to “attend” these courses through the new technology, as a very affordable way to
learn about EIB's products.

Courses, dates, locations:

May 13,25: Guidance on 15% Rate-Of Progress Plans & Attainment Demonstrations, APTI satellite course.

May 15: TANKS, AWMA Training Institute, Houston, TX.

May 16: EIB Emission Estimation Tools, AWMA Training Institute, Houston, TX.
June 2: TANKS, APTI satellite course.

June 3: EIB Emission Estimation Tools, APTI satellite course.

June 12: TANKS, AWMA Annual Meeting, Denver, CO.

June 13: EIB Emission Estimation Tools, AWMA Annual Meeting, Denver, CO.

Sep. 28-30: _ Emission Inventory Issues, APTI satellite course.

For more information on the AWMA courses, contact Beth O'Toole, AWMA, (412) 232-3444, Regarding the APTI
courses, contact Charles Pratt, (919) 541-2355.

EIB also has funds that will provide two additional courses at Regional or state/local offices. We have just completed a
course with Region I and the State Of Massachusetts. Any State/local or Region interested in hosting a course should request
it in writing to Anne Pope, at the Newsletter. #

© Quiz CoRNER O

George Leney, head of the EI section of the Allegheny Cy. Health Dept. in Pittsburgh, is on a roll. George was first in
with the correct answer to the October puzzle, and now we congratulate him again. Close on his heels were Geary
McMinn, of the Chapel Hill office of TRC; and Ken Sentlal, of the Massachusetts agency. The answer was "Happy
Holidays From EIB".

Now get out the calculators. Here's another challenge, by Keith Baugues and Tom Pierce, which requires knowledge of
biogenic emissions. Send responses to Whit Joyner at the Newsletter, phone (919) 541-5493.

<% @ @ ARBOR DAYSPECIALE % % >
- 1) How many full grown oak trees does it take to emit one ton/hour of biogenic hydrocarbons, in full sun, at 75° F?
— 2) Ceteris paribus, how many @ 95° F?
— 3) How many full grown pine trees will emit one ton/hour of biogenic hydrocarbons, in full sun, at 75° F?
—4) Ditto @ 95° F?
— 5) How many full grown corn stalks will emit one ton/hour of biogenic hydrocarbons, in full sun, at 75° F?
- 6) Ditto @ 95° F?
— 7) How many full grown tobacco plants will emit one ton/hour of biogenic hydrocarbons, in full sun, at 75° F?
~ 8) Ditto @ 95° F? &

0 2) 3) e 15) 6) 7) (3) °


JEIOG CONSIDERS AIR TOXICS DATA SYSTEM

The Air Toxics Subcommittee of the Joint Emission
Inventory Oversight Group (JEIOG) is interested in
determining the need for a computerized data base
management system to help state and local agencies handle
air toxics inventory data. Being considered are 1) a relational
data base system in a client/server UNIX environment, 2) a
stand-alone pc-based system, and 3) a pe system that could
function as a front end for a client/server data base. The
Subcommittee, comprising people from both the Office Of
Air Quality Planning And Standards and the Office Of
Research And Development, wants to hear from all possible

users of such a system. To facilitate discussion, they have
developed a prototype pc system that can perform basic data
entry and can report air toxic output functions for both point
and area sources. This prototype does not mesh with other
emission estimation models for calculation purposes, but we
are considering at least an interface with EIB's Factor
Information Retrieval (FIRE) program.

JEIOG wants to determine the need for a working version
of this pc prototype for use by state/local agencies. If you
are interested in this topic or have comments, please contact
Chuck Mann at (919) 541-4593. «

% TECH NOTES ....

98 — EMISSION INVENTORY SUBMISSIONS -— To date, EIB has received final emission inventories for approximately
88% of the 03/CO nonattainment areas expected to submit. Inventory components that are expected include point, area,
mobile and biogenic (for 03) data; documentation; and the computerized data submissions to EPA's Aerometric Information
Retrieval System (AIRS). For more information, contact Lee Gabele at the Newsletter, (919) 541-5292.

3 — CALL FOR PAPERS - A symposium on Optical Sensing For Environmental Monitoring, sponsored by AWMA and
the International Society For Optical Engineering, will be held in Atlanta October 11-15, 1993. There will be 10 conference
sections, with parallel technical sessions, and commercial products will be on display. Also, 3 courses will be available on
Oct. 10. Emphasis will be on the developments in optical spectroscopy, sensing and diagnostic technology and its
applications, and regulatory methods development. For conference information, contact AWMA, Box 2861, Pittsburgh, PA
15230, phone (412) 232-3444. Submit papers to Ormand A. Simpson, MDA Scientific, Inc., 3000 Northwoods Pkwy,
Suite 185, Norcross, GA 30071, phone (404) 242-0977. Abstracts are due by May 14.

% — AIRS FACILITY SUBSYSTEM (AFS) — The 8th quarterly AIRS/AFS Status Report has been distributed. This
report summarizes the States’ progress (or lack of it) in completing their annual data update to AFS regarding point sources
emitting 100 tons per year or more. At the time of the report, only 46% of the subject plants have 1990 or 1991 as the latest
year of record. Given the importance of the 1990 Base Year Inventory activities, we are urging the States to pay more
attention to this issue. For more information, contact Lee Gabele at the Newsletter, (919) 541-5292. #

1993 IS THE YEAR OF EMISSION INVENTORY
REVIEW & IMPROVEMENT!

FINAL EMISSION INVENTORIES FOR O3/CO NONATTAINMENT AREAS
WERE DUE TO EPA BY 11/15/92.



ms My

tates Office Of Air Quality EPA-454/N-93-010
Environmental Protection Planning And Standards Volume IV, No. 3
Agency Research Triangle Park, NC_27711 April_1993

Tue CHIEF NEWSLETTER

— THE CLEARINGHOUSE FOR INVENTORIES AND EMISSION FACTORS —

EMISSION INVENTORY IMPROVEMENT PROGRA

SEEKS VOLUNTEERS

At their meeting recently in Jackson Hole, WY, the
STAPPA/ALAPCO membership passed a resolution to
adopt the Emission Inventory Improvement Program (EIIP),
a major effort to improve the quality and quantity of
emission data. The resolution proposed that:

- STAPPA, ALAPCO, and EPA undertake a joint effort
to develop the EIIP,

- a steering committee be appointed to begin program
development, and

- §105 grant funds in the amount of $750K per year be
used to operate the program.

The EIIP Program will match well with EPA's new
approach to giving state/local agencies more operating
responsibility , specifically in influencing the development

of procedures for compiling inventories. For the program to
be successful, it is essential that the agencies having data
gathering experience help in developing the guidance which
will be used by the entire community.

The EIIP steering committee has been formed and is in the
process of setting up subcommittees (Preferred Methods,
Quality Assurance, EPA/State/Local interactions, Data
Reporting and Handling) which will oversee developing the
various standard procedures. The first meetings of the
subcommittees are scheduled for September and October.

Anyone interested in being a member of any of these
subcommittees should call Roger Westman, Allegheny
County, PA, Health Department, (412) 578-8103; or Steve
Bromberg at the Newsletter, (919) 541-1000. 4

"NOW THAT YOU'VE TALKED ME INTO A CD-ROM READER ...."

“Air CHIEF is wonderful, and we can't live without it, but
what else can I use this CD-ROM drive for?" This is a
recurring question on the Info CHIEF help line, and we have
some suggestions. Here are just a few of the CDs we've
seen around our office. If you know of others that would be
useful to Newsletter readers, please notify the Info CHIEF,
Angela Andrews, (919) 541-5285; through the BB E-mail:
andrews.angela@epamail.epa.gov.

CDs from EPA:

+ Air CHIEF — Contains the stationary source volume of
AP-42, the Locating And Estimating series, FIRE and
SPECIATE. For nonprofit organizations, free from Info
CHIEF, for others, the Government Printing Office
(GPO), (202) 783-3238, $15. Annual updates.

* Toxic Chemical Release Inventory (TRI) — Data reported
by facilities that manufacture, process, or use over 300
designated toxic chemicals. Contact person is Lisa
Capozzoli (202) 260-1531; from GPO, $28; or NTIS,
(800) 553-6847, $45.

+ EPADOC - EPA policy and procedures manuals and
guides. EPAers call Tom Clemmer (919) 541-1057;
others, GPO, $15.

* Risk Assessment Library — Prototype disk containing over
150 documents on human exposure to a wide variety of
chemicals. Available to EPA only! Call Richard
Walentowicz, (202) 260-8922. Limited distribution for
review and comments.

From elsewhere:

+ US Code on CD - Full-test of all 50 titles of official
compendium of US laws in effect as of Jan 1991. GPO,
$30. Annual updates.

+ OSHA Regulations, Documents, Technical Information —
From GPO - single issue $28; year's subscription, $88.

+ FAR/FIRMR in CD-ROM — From GPO. Single issue
$33; year's sub, $106.

+ TAURUS (Technology Acquisition Resource & Update
Service) — This is the "Acquisition Toolbox". Contains
laws, regulations, guides, checklists, etc. for the
procurement process. Call (703) 719-7602 or NTIS
(800) 553-6847 — year's sub, $2495. Quarterly updates.

Catalogs:

+ Electronic Information Products: CD-ROM — From GPO,
(202) 783-3238.

* National Technical Information Service — Request
“NTISPR888" and NTISPR827", (800) 553-6847.

Recycied/Recyciable
nied with Soy'Canola nk on paper that
conians at east 50°» recycled fiber


HEADQUARTERS INVENTORY CONTACTS

April 1993
— EMISSION FACTORS —
AP-42 Chapter Contact Telephone (919) 541-
1. External Combustion Joe McSorley 4796
2. Solid Waste Disposal Ron Myers 5407
3. Internal Combustion Michael Hamlin 5232
4. Evaporation Loss Sources Ron Ryan 4330
5. Chemical Process Industry
Organics Dennis Beauregard (on rotational assignment) 5512
Inorganics Ron Myers 5407
6. Food And Agricultural Industry Dallas Safriet 5371
7. Metallurgical Industry Dennis Shipman 5477
8. Mineral Products Industry Ron Myers 5407
9. Petroleum Industry Ron Ryan 4330
10. Wood Products Industry Dallas Safriet 5371
11. Miscellaneous Sources Dennis Shipman S477
12. Storage Of Organic Liquids Anne Pope 5373
Other — Toxics Anne Pope 5373
Lead Dennis Shipman/Ron Myers 5477/5407
General information, Newsletter,
Bulletin Board, XATEF, SPECIATE,
Air CHIEF CD, Publications Info CHIEF 5285
— EMISSION INVENTORIES —
1990 03/CO SIP Inventory Status Sharon Nizich 2825
Inventory Guidance
PM-10, Lead Bill Kuykendal 5372
0yCO David Misenheimer 5473
AIRS/AFS Emissions Data Quarterly Report Lee Gabele 5292
AIRS Area And Mobile Subsystem (AMS) Lee Gabele 5292
AIRS Facility Subsystem (AFS) David Misenheimer 5473
Biogenic Inventories Steve Bromberg 1000
Emission Statements Mary Ann Wamer-Selph 1192
Mobile Sources Mary Ann Warner-Selph 1192
Modeling-related Inventories Mary Ann Wamer-Selph 1192
PM-10/Lead Bill Kuykendal 5372
Quality Assurance Sharon Nizich 2825
Tracking Reasonable Further Progress Mary Ann Warner-Selph 1192
SIP Air Management System (SAMS) David Misenheimer 5473
Toxics Inventories Anne Pope 5373
Emission Trends David Misenheimer 5473
Other David Misenheimer 5473
— PM-10 SIPS —
OAQPS/AQMD Larry Wallace 0906
OAQPS/SSCD Chris Oh (202) 308-8732
— 03/CO SIPS —
OAQPS/AQMD Laurel Schultz 5511
OAQPS/SSCD Vishnu Katari (202) 308-8717
Office Of Mobile Sources Mark Wolcott (313) 668-4219
—LEAD SIPS —
OAQPS/AQMD Tom Pace 5634



CD Catalogs (cont.):

* CD-ROMs In Print — An international guide to CD-ROM,
CD-I, CDTV and Electronic Book Products. Call
Meckler Publishers, (800) 635-5537; year's sub $165.

+ SelectWare — “The ultimate software demonstration
system" — This is really a lot of fun. A CD-ROM on-
screen magazine to keep up with the ever changing
worlds of CD-ROM and Multimedia; call (800) 342-

3366; year's sub $99.
* "SIGCAT Compendium", by Jerry McFaul, in March
1993 Computers In Libraries.

In case you haven't discovered it yet, your CD reader will
play your audio CDs from home. It installs well as a
WordPerfect Office® menu item. You can even load the
driver as a TSR (resident program) and then hot key from
other programs when it's time to change the music. #

IN THE CHIEF'S CORNER

Here we are again, marking the passage of another quarter.
Time has a fleeting way when one's under the gun to get
things done, to meet schedules and to make progress while
taking care of all those daily chores and frequent
"emergencies" that just show up at the door. We're
proceeding with our cover-to-cover revision of AP-42, busily
reviewing lots of new and updated sections. We're trying to
Tun a stack testing program to get more data for factors;
pressing forward with the technology transfer elements of our
program; limping along trying to get a complicated air
toxics inventory effort going in the right direction — all this
with too few resources, and generally taking on more than
we can get done. Needless to say, the negative surprises
usually overwhelm the positive ones, and our ambitious
plans get ‘way behind. Supplement F is still expected to
come out toward Summer, and the new Fifth Edition of AP-
42 will follow this Winter. Supplement F will have fewer
sections than we had hoped. We'll keep at it, and it'll be on
its way to you as soon as humanly possible.

This Newsletter now goes to more than 5000 people in 52
countries, and we're always interested in your comments and
suggestions regarding it. The CHIEF bulletin board use is
still growing. Over the last quarter, more than 900 registered

users have logged on over 4500 times to read alerts, browse
new material, communicate electronically with other users,
and download documents and programs. Let us know what
you think about the BB, especially how it can be of more
use to you in your work.

We've ordered a new gadget to help speed things up —
another way of helping our users get what they need and
want. It's a facsimile machine that will hold up to 5000
pages in its "memory", so that users may dial in, fax
themselves the machine's menu, and then have it transmit
AP-42 back to them — a section or sections, or any portion
they can use. We have so many people calling us for such
information, and often they want just a few pages. With this
new device, perhaps a “less threatening" conveyance, even
folks without a pc/modem to load from the CHIEF BB will
be able to get information from the latest AP-42. It'll be
quite easy, and certainly less time-devouring for us!

Getting this machine on line blends with Total Quality
Management (TQM) - more and better service to the
customer, easier and at lower cost. We'll announce the
phone lines for this new capability in the next issue, with
details on what's needed to make use of it. «

Jim Southerland
Chief, Emission Factor & Methodologies Section

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SRANCS

THE CHIEF NEWSLETTER is produced quarterly by the Emission
Inventory Branch, Technical Support Division, of EPA's Office Of Air Quality
Planning And Standards. Its purpose is to enhance communication within the
emission factor and inventory community by providing new and useful
information and by allowing for the exchange of information between and among
a its readers. Comments on the Newsletter and articles for inclusion in it are
welcome and should be directed to Whitmel M. Joyner, Editor, Emission
Inventory Branch (MD 14), US EPA, Research Triangle Park, NC 27711;
commercial phone (919) 541-5493.

The contents of THE CHIEF NEWSLETTER do not necessarily reflect
the views and policies of the Agency, neither does the mention of trade names or
commercial products constitute endorsement or recommendation for use. #9



v FIRST, CALL INFO CHIEF!
— (919) 541-5285 —

Info CHIEF is your answer to the question "Who ya gonna call?" (Actually, whom you gonna etc.) Since May 1992, the
Info CHIEF help desk has been available to satisfy your thirst for information about air emissions estimation tools. Angela
Andrews, our esteemed on-site contractor, resided at this number, and she can help you with any of these:

— Directing your technical questions to the right EIB expert .
— Helping you acquire such EIB products as the Air CHIEF CD-ROM, the TANKS calculation program, etc.
—— Supporting you in the installation and use of those programs.
— Helping you locate guidance documents such as the Locating & Estimating . . . series, AP-42, etc.
— Helping you use the CHIEF Bulletin Board, including registration, downloading, etc.
We are averaging almost 200 calls and 430 requests every month, so if you don't get an immediate response, please be

patient. Leaving a voice mail message is encouraged. #

NEW FROM NADB:

AIRS Graphics (AG) —

A new utility is available that maps where to locate things
in AIRS, with other graphics depicting AIRS data. The
system is fast, intuitive and easy enough to use with little or
no training, even for a manager.

AG is menu-driven SAS/GRAPH application developed
for the National Air Data Branch (NADB), specifically for
use with AIRS data. A series of selection screens prompts
AG users for certain criteria to build maps at U. S., regional,
state and county levels that will locate certain kinds of air
quality monitors and emission point sources, and will give
selected attributes of the monitors. AG doesn't have the
sophistication of ARC/INFO or other multilevel Geographic
Information Systems, but it will meet many AIRS users’
basic mapping needs, with no need for additional training.
AIRS Graphics operation will be familiar to AIRS
subsystem users. The program is able to create graphics
from new and existing AIRS subsystems. AG outputs
include color hard copy, metafiles for export to pc software
such as Freelance® and Harvard®, bitmap screen files for
repeat viewing and sharing with other catalogs and more.

What do you need to do AG?

--Basic knowledge of AIRS and its architecture

--National Computer Center (NCC) Timeshare Account
--NCC User ID

--3270 Connection via hardware, software or LAN

--Time Sharing Option access

--A graphics terminal or a pe with software that can make the
PC ‘think’ it's a graphics terminal.

For more information about AIRS Graphics, call the
AIRS Hotline (800-333-7909) and ask for a graphics
specialist.

AIRS Executive (AE) —

AE is a pc program developed for NADB and AIRS users
to provide portability of summary mainframe data. AE is
designed for managers who need quick answers about AIRS
data, such as what is the largest SO2 source in the USA? Or
which monitor recorded the highest ozone concentration
reading in 1989? or 1991? AIRS Executive also provides the
user with various tools for using AIRS data sets with
popular pe programs such as Lotus® and dBase®. AE is
targeted for the ‘casual’ or infrequent user of AIRS, needing
perhaps high-level, summary statistics. Others might
consider using AG.

New data sets and program enhancements for AE will be
generated on the AIRS Bulletin Board the last Thursday of
each month. Users also may install separate versions of the
software for each month, which will allow for monthly trend
analysis. Later in FY93, work will be begin on rendering
AE in the CD-ROM format which will allow for larger data
sets for more years, and a more comprehensive selection of
maps from AG.

A new Windows® 3.1-compatible version of AIRS
Executive is nearing completion. with a beta version
expected this Summer. AE software soon will be available
on the AIRS electronic bulletin board. For more
information, call Virginia Ambrose at the National Air Data
Branch, (919) 541-5456. «

EE eee

UPCOMING MEETINGS AND CONFERENCES

— Comparative Risk Analysis And Priority Setting Of Air Pollution Issues, 7-11 June 1993, Keystone, CO. Contact Marci Mazzei, AWMA,
Box 2861, Pittsburgh, PA 15230, phone (412) 232-3444

— 86th Annual Meeting of AWMA, 13-18 June 1993, Denver, CO. Contact Lisa Bradley, AWMA, Box 2861, Pittsburgh, PA 15230, phone
(412) 232-3444,

— AWMA Specialty Conference, "The Emission Inventory: Perception And Reality", 18-20 October 1993, Pasadena, CA. Contact Patricia
uelasce. CA Air Resources Board, Box 2815, Sacraments, CA 95812, or Kathy Hsiao, South Coast AQMD, 21865 E. Copley, Diamond Bar,
91765. &