1 / 39

GIS Applications for Air Quality Management

GIS Applications for Air Quality Management. Robert Wu 吳震球 South Coast Air Quality Management District SCCAEPA April 26, 2008. Geographic Information System A Definition of GIS.

mathewm
Download Presentation

GIS Applications for Air Quality Management

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. GIS Applications forAir Quality Management Robert Wu 吳震球 South Coast Air Quality Management District SCCAEPA April 26, 2008

  2. Geographic Information SystemA Definition of GIS GIS is a system of computer software, hardware, data, and personnel to help manipulate, analyze and present information that is tied to a spatial location

  3. GIS Applications for Air Quality Management • Providing Air Quality Information • Health Risk Assessment Tool • Compliance/Enforcement Tool • Environmental Impact Analysis • Planning/Analytical Tool

  4. GIS Applications for Air Quality Management (cont’d) • Exposure Studies • Identify Hot Spot Areas • Rule Development • Identification of Sources • Proximity Analysis

  5. South CoastAir Quality Management District

  6. South Coast Air Quality Management DistrictSource/Receptor Areas

  7. South Coast Air Quality Management DistrictAir Monitoring Stations

  8. Public Information on Air Quality(Ozone Levels)

  9. Air Dispersion Modeling

  10. Cancer Risk Isopleth

  11. Proximity of Regulated Facilities to a Proposed School Site

  12. Impact of Emission of Toxic Air Contaminants on a Community

  13. Regulated Sources of Emissions- All Types

  14. Specific Type of Regulated Industries

  15. Chrome Plating Facilities- Toxic Air Contaminant Sources

  16. Proximity of Schools to Chrome Plating Facilities

  17. Emission Inventory Gridded Emissions

  18. Proximity Analysis- Buffering

  19. AERMOD Regulatory Status and Applicability • AERMOD is now an EPA Guideline Model, replacing ISCST3 • Published in Federal Register 9 Nov 2005 • Became Effective 9 Dec 2005 • First major short-range model promulgation in 25 years • Applicable for distances up to 50 km • 1-Year grace period for ISCST3

  20. Implications for Departure of ISCST3 • This is a big deal - ISCST3 used around the world • In California, ISCST3 can still be used for State-only programs, BUT • ARB is moving the HARP model and air toxic program to AERMOD • Future ISCST3 modeling will be subject to criticism of not reflecting “best science” • Most District rules require permit modeling to follow EPA’s Guideline on Air Quality Models

  21. AERMOD Overcomes Many ISCST3 Deficiencies • Meteorology treatment • Dispersion treatment • Building wake treatment • Terrain treatment

  22. AERMOD Modeling System Structure AERMAP (Terrain) AERMOD(Dispersion) AERMET(Meteorology) AERSURFACE(Boundary Layer) AERSCREEN(Screening) Development In Progress

  23. Comparison of Dispersion Model Features: Complex Terrain Modeling • ISCST3: • Elevation of each receptor point input • Predictions are very conservative in complex terrain • AERMOD: • Controlling hill elevation and point elevation at each receptor are input • Predictions are nearly unbiased in complex terrain

  24. Overall Summary of Model Formulation • AERMOD is based on a newer understanding of atmospheric turbulence and dispersion • AERMOD solves many identified problems with ISCST3 • The issue of over-predictions in complex terrain is eliminated

  25. Implementation of AERMOD in Southern CaliforniaAir Resources Board • HARP incorporates ISCST3 as an internal module • ARB will upgrade HARP to AERMOD • Definitive plans not yet made • Implementation highly unlikely by Dec 2006 • Critical decision: internal module vs external file • ARB staff have begun to run AERMOD • No current plans to hold AERMOD training courses for District staff • Not Discussed: Where is the funding coming from? 2/1/06

  26. Reasons to Begin the Switch to AERMOD • ISCST3 will be allowed only until 9 Dec 2006 • ARB is implementing AERMOD in HARP • Restrictive ISCST3 modeling results may be relaxed with AERMOD • Facilities with complex terrain and building downwash issues expect the largest benefit • AERMOD is a complex model with a long learning curve

  27. Expect to Buy a Faster Computer Real World ENSR Permit Modeling AERMOD Run • 3.0 GHz Intel XEON Workstation • 317 Sources: • 72 point sources (60 w/ downwash) • 236 volume sources • 9 area sources • 3,563 Receptors • 1.13 Million Source-Receptor Pairs • 215 source-receptors / min • 87.6 hours elapsed run time

  28. Difficulties Ahead with Implementation • Meteorological data acquisition • Specific data requirements for AERMOD • EPA requiring 3-5 years of data • Quality upper air data critical • Funding • Where will ARB get funding for HARP development? • Where will Districts get training budgets? • Where will Districts get funding to upgrade their meteorological monitoring networks if needed?

  29. Impact Analysis of Emissions • Gridded emission inventory • Temporal emission analysis • Show relationships between emissions and health effects data • Siting of new schools or facilities • Impact on sensitive receptors (schools, day-care centers, hospitals, etc)

  30. AB 2588 • Emission Inventory • Prioritization • Risk Assessment • Public Notice • Risk Reduction California program under the Air Toxics Hot Spots Information and Assessment Act of 1987, Health and Safety Code Section 44300

  31. Hotspots Analysis and Reporting ProgramHARP • Effective in 7/1/2005, required in Tier IV • Emission Inventory - CEIDARS • Dispersion Modeling – ISCST • Mapping – GIS • Analysis - HRA

  32. Toxics Emission Inventory • Assembly Bill 2588 • SCAQMD MATES Project • Community Health Air Pollution Information System (CHAPIS) • California Emission Inventory Development and Reporting System (CEIDARS 2.5)

  33. California Emission Inventory Development and Reporting System (CEIDARS 2.5)

  34. Rule 1401New Source Review for Air Toxics • Adopted in June 1, 1990 • Initially specified limits for maximum individual cancer risk (MICR) and excess cancer cases for new, related, or modified sources which emit carcinogenic air contaminants • Amended several times to include non- carcinogenic compounds and to update the list of toxic compounds and the corresponding risk values

  35. Rule 1401New Source Review for Air Toxics • Risk-based Regulation • 4-Tier Health Risk Assessment (HRA) • Tier I – Screening Emission Levels • Tier II – Screening Risk Assessment • Tier III – Screening Dispersion Modeling • Tier IV – Detailed Risk Assessment • Standards • Cancer Risk > 10-6 without T-BACT • Maximum Risks for each permit unit: • Cancer Risk = 10-5 • Cancer Burden = 0.5 • Hazard Index = 1.0

  36. Rule 1401New Source Review for Air Toxics

More Related