Roadway Modeling using CAL3QHCR (A Line Source Model)

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Roadway Modelingusing CAL3QHCR (A Line Source
Model)
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CAL3QHCR Model

• Line source model
• Input data
• Sequential meteorological data (ISCST3
  meteorological input files)
• Emission factors
• Roadway link information
• Traffic data
• Receptor locations

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Methodology for Preparing Traffic Data Inputs

• Procedure described in detail in the Guidelines
• Data sources
• Peak vehicles/hour for road segment from CALTRANS
  (http//www.dot.ca.gov/hq/traffops/saferesr/traffd
  ata/)
• BURDEN run with hourly output from EMFAC
• Key assumptions
• Gasoline PM is as toxic as diesel PM
• Ratio of cars to trucks is the same on all
  roadways throughout the county

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Standard Inputs
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Example Project Location
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Cancer Risk Results
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Graph Cancer Risks with Distance
Risk drops with distance
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Other CAL3QHCR Features

• Used for modeling only roadway sources
• Add results from modeling other source types with
  ISCST3 or AERMOD
• Can be used to model
• Traffic intersections
• Traffic signaling
• Queuing

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• Questions