CALRoads View™

Traffic Air Dispersion Model

Technical Specifications

CALRoads View is an interface for the CALINE4, CAL3QHC and CAL3QHCR models. See below the technical specifications for these three popular traffic air dispersion models:

CALINE4

Parameter

Description

Model Name

CALINE4 - California Line Source Dispersion Model

Model Guide

CALINE4 Model User's Guide

Developed By

California Department of Transportation (Caltrans)

Model Type

Steady-state Gaussian Plume model

Time Step

1 hour

Range

Near-field

Terrain

Not modeled

Building Downwash

Not modeled

Source Types

Line source (road)

Input Meteorology

User selected meteorological condition

Wind Field

Homogeneous

Release Types

Vehicle emissions

Emission Types

Constant

Atmospheric Chemistry

None

Regulatory Status

US EPA regulatory model for traffic dispersion

CAL3QHC

Parameter

Description

Model Name

CAL3QHC

Model Guide

CAL3QHC Model User's Guide

Developed By

U.S. Environmental Protection Agency

Model Type

Steady-state Gaussian Plume model

Time Step

Variable

Range

Near-field

Terrain

Not modeled

Building Downwash

Not modeled

Source Types

Line source (road); free flow and queue

Input Meteorology

User selected meteorological condition

Wind Field

Homogeneous

Release Types

Vehicle emissions

Emission Types

Constant

Atmospheric Chemistry

None

Regulatory Status

US EPA regulatory model for traffic dispersion

CAL3QHCR

Parameter

Description

Model Name

CAL3QHCR

Model Guide

CAL3QHCR Model User's Guide

Developed By

U.S. Environmental Protection Agency

Model Type

Steady-state Gaussian Plume model

Time Step

Variable

Range

Near-field

Terrain

Not modeled

Building Downwash

Not modeled

Source Types

Line source (road); free flow and queue

Input Meteorology

Hourly surface data and mixing height data (through RAMMET)

Wind Field

Homogeneous

Release Types

Vehicle emissions

Emission Types

Constant and variable (traffic patterns)

Atmospheric Chemistry

None

Regulatory Status

US EPA regulatory model for traffic dispersion

System Requirements

This product is a Microsoft Windows-based program that can be installed in the following Windows operating systems:

  • 32-Bit and 64-Bit Operating Systems
  • Microsoft Windows 7 (Home Premium, Professional and Ultimate Versions)
  • Microsoft Windows Vista (Business and Ultimate Versions)
  • Microsoft Windows XP Professional (Service Pack 3)

Minimum requirements:

  • An Intel Pentium 4 processor (or equivalent) or higher
  • At least 2 GB of available hard disk space
  • 1 GB of RAM (2 GB recommended)