Emissions Inventory MATES III Technical Advisory Group March 13, - - PowerPoint PPT Presentation

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Emissions Inventory MATES III Technical Advisory Group March 13, - - PowerPoint PPT Presentation

Jan 29, 2023 556 likes •681 views

Emissions Inventory MATES III Technical Advisory Group March 13, 2008 Outline Methods Results for carcinogens Species apportionment Source apportionment Emissions and air quality changes since MATES-II Methods 2007

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SLIDE 1

MATES III Technical Advisory Group March 13, 2008 Emissions Inventory

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SLIDE 2

Outline

  • Methods
  • Results for carcinogens

Species apportionment Source apportionment Emissions and air quality changes since MATES-II

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SLIDE 3

Methods

  • 2007 AQMP inventory forms the basis of

the MATES-III toxic inventory.

  • 2002 baseline emissions projected to 2005.
  • “Top-down” approach used for developing

toxic emissions.

– i.e., chemical composition of TOG and PM emissions determined by ARB’s speciation profiles. – http://www.arb.ca.gov/ei/speciate/speciate.htm.

  • Emissions spatially allocated to 2 km by 2

km grid cells.

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SLIDE 4

Why “Top-down Approach?

  • Speciating TOG and PM inventories affords

consistency with 2007 AQMP.

– Fits in with AQMD’s goal of a comprehensive plan

  • Photochemical modeling requires complete

speciation of TOG; an inventory of just toxics would be insufficient.

  • AQMP tools for projecting future emissions &

air quality benefits can also be used for MATES-III to estimate cancer risk benefits from the AQMP.

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SLIDE 5

Pollutants Inventoried

* denotes carcinogen Nickel* 1,4 Dioxane* Naphthalene* Diesel particulate* Vinyl chloride* MTBE* 1,1 Dichloroethane* Trichloroethylene* Methylene chloride* Chromium Toluene Methyl ethyl ketone Chloroform* Styrene Lead* Carbon tetrachloride* Silicon Hexavalent chromium* Cadmium* Selenium Formaldehyde* 1,3 Butadiene* Propylene oxide* Ethylene oxide* Benzene* Perchloroethylene* Ethylene dichloride* Arsenic* p-Dichlorobenzene* Ethylene dibromide* Acetone Organic carbon Elemental carbon Acetaldehyde*

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SLIDE 6

Emission Inventory Results

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SLIDE 7

Preliminaries

  • Slides that follow only consider carcinogens.
  • Emissions are in diesel PM currency.

– i.e., emissions weighted by the ratio of the carcinogen’s cancer potency to the cancer potency of diesel PM.

  • 1998 = MATES-II; 2005 = MATES-III
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SLIDE 8

Species Apportionment of Cancer Potency Weighted Emissions

99.6 Total 0.24 Naphthalene 0.97 Formaldehyde 0.26 Hexavalent chromium 2.92 Perchloroethylene 0.29 Cadmium 2.95 Benzene 0.30 p-dichlorobenzene 4.02 1,3-Butadiene 0.66 Arsenic 86.94 Diesel particulate Contribution (%) Toxic Contribution (%) Toxic

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SLIDE 9

Carcinogenic Source Apportionment

On-road 36% Off-road 57% Point 2% Area 5% On-road Off-road Point Area

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SLIDE 10

Carcinogenic Emissions

(MATES-II vs. MATES-III)

20,000 40,000 60,000 80,000 MATES-II (1998) MATES-III (2005)

Emissions as DPM (lbs/day) On-road Off-road Point Area

43% decrease Area 65% decrease Point 1% increase Off-road 13% decrease On-road Percent Change Source Category

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SLIDE 11

Emission and Air Quality Changes Since MATES-II

  • 81%
  • 65%

Trichloroethylene

  • 34%
  • 22%

Nickel

  • 78%
  • 58%

Perchloroethylene

  • 53%
  • 14%

Lead

  • 53%
  • 38%

Methylene Chloride

  • 5%
  • 85%
  • Hex. Chromium
  • 9%
  • 21%

Formaldehyde

  • 28%
  • 2%

Elemental Carbon

  • 73%
  • 31%

1,3 Butadiene

  • 75%
  • 19%

Cadmium

  • 50%
  • 36%

Benzene

  • 59%
  • 20%

Arsenic

  • 9%
  • 9%

Acetaldehyde AQ E Particulates AQ E Gases