Alexis Zubrow, Alison Eyth, Rich...
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Alexis Zubrow, Alison Eyth, Rich Mason AQAST Conference, June 2014 1
Transcript of Alexis Zubrow, Alison Eyth, Rich...
Alexis Zubrow, Alison Eyth, Rich MasonAQAST Conference, June 2014
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The full NEI is on a 3 year cycle
States, locals, and tribes (S/L/Ts) are required to submit criteria pollutants
◦ Air Emissions Reporting Requirements (AERR) defines the requirements of S/L/Tsto collect and submit emissions
Hazardous Air Pollutants (HAPs) and GHGs are voluntarily submitted
Emissions Inventory System (EIS) used to build and release the NEI
◦ Data hierarchy: S/L/T data typically above EPA generated data
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Solvent - Dry Cleaning
All HAPs EPA SLT EPA & SLT
P - Point
N - Nonpoint
PN - P&N
Onroad – MOVES submitted inputs
Evaluations of trends across years and space
Methodological changes◦ Example – onroad model changed in 2008 NEI v2
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NO
X(m
illion t
ons)
Switch to MOVES
Draft
Black Carbon (BC) is primarily calculated by speciating PM2.5 from the inventory
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- 10 20 30 40 50 60 70 80 90 100 110 120
Wildfires
Prescribed Fires
Agricultural Field Burning
DieselEquipment
Railroad
CMV
Gas
Aircraft
Other
DieselHeavyDuty
GasLightDuty
DieselLightDuty
GasHeavyDuty
Residential
IndusBoilers
Comm/Instit
ElecGeneration
WasteDisposal
CommercialCooking
DustPavedUnPavedRoads
Agriculture
Non-IndustrialNEC
Industrial Processes
SolvCommercialIndustrial
Tons Thousands
Source: U.S. EPA 2011 NEI V1; 2011v6 Emissions Modeling Platform
2011 NationalBlack Carbon Emissions
Fires
FuelCombustion
MobileOnroad
Misc Other
MobileNonroad
IndustrialProcesses
51% is from natural gas, 20% from biomass
95% is from biomass burning
51% is from natural gas, 37% from coal
95% is from open burning of residential waste and debris from land clearing
Fires42%
Mobile Nonroad
22%
Mobile Onroad19%
Fuel Combustion
11%
MiscOther4%
Industrial Processes
2%U.S. 2011
Black Carbon Emissions
Source: U.S. EPA 2011 NEI V1; 2011v6 Emissions Modeling Platform
Processing steps needed to convert emissions inventories into the resolution and formats needed by air quality models.
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Inventories(annual/
monthly/daily)
0
1
2
3
4
5
1
23
45
67
89
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1
13
3
15
5
17
7
19
9
22
1
24
3
26
5
28
7
30
9
33
1
35
3
PM
2.5
(to
ns)
Chittenden Co, VT: RWC 2011 Daily
PM2.5
Gridded, hourly, speciated emissions
Speciation
Distribution of emissions across time
Annual -> month, month -> day, day -> hour
Examples of meteorological based temporalization:
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0
1
2
3
4
5
1
17
33
49
65
81
97
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3
12
9
14
5
16
1
17
7
19
3
20
9
22
5
24
1
25
7
27
3
28
9
30
5
32
1
33
7
35
3
PM
2.5
(to
ns)
Chittenden Co, VT: RWC 2011 Daily PM2.5
RWC: Annual -> dailyBased on: daily minimum T
Ag livestock NH3:Monthly -> hourlyBased on: T, wind, aerodynamic resistance
Distributions of emissions across space Typically county -> grid cell
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Oil & Gas surrogates for Northeast
CMV (C1 and C2) in Gulf
2011 modeling platform and 2018 projected emissions are primarily based on 2011 NEI v1◦ Received comments from S/L/Ts, environmental
groups and industry
Basis for EPA’s air analyses for rules and other purposes:◦ Transport of pollution across state boundaries ◦ Health risks from toxic emissions (e.g. 2011 NATA
v1) ◦ Criteria pollutant standards (e.g. O3 NAAQS
proposal) ◦ GHG co-benefits (e.g. EGU GHG proposal - 111d)
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Challenge with top-down analysis/emissions◦ Matching observations to sources and sectors
NEI has thousands of process codes-> 60 EIS sectors -> 19 modeling sectors
◦ Aligning the spatial and temporal scales of observations vs inventories
Short term goals◦ Improvements to temporalization◦ Improvements to spatial gridding◦ Comparisons against inter-annual trends
Long term goals◦ Improving international emissions◦ Identifying missing or under/over represented point
sources◦ Dynamic updates to inventories for operational forecasting◦ Developing between cycle emission platforms
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2011 NEI v1:http://www.epa.gov/ttn/chief/net/2011inventory.html
Emissions trends:www.epa.gov/ttn/chief/trends
2011 Emissions Modeling Platform:http://www.epa.gov/ttn/chief/emch/index.html#2011
My contact: [email protected]
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CMV – Commercial Marine Vehicles
EGU – Electric Generating Unit
EIS – Emissions Inventory System
NAAQS – National Ambient Air Quality Standards
NATA – National-Scale Air Toxics Assessment
NEI – National Emissions Inventory
RWC – Residential Wood Combustion
S/L/T – State/Local/Tribal
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