Environmental and Pollution
CALROADS Ver 6.2.6

CALRoads View is an air dispersion modeling package for predicting air quality impacts of pollutants near roadways.  CALRoads View combines the following mobile source air dispersion models into one seamless integrated graphical interface: CALINE4, CAL3QHC, and CAL3QHCR.

These US EPA models are used for predicting air pollution concentrations of carbon monoxide (CO), nitrogen dioxide (NO2), particulate matter (PM), and other inert gases from idle or moving motor vehicles.

3 Models in 1 Integrated Interface!

1

CALINE4

 

The CALINE 4 model predicts air concentrations of carbon monoxide (CO), nitrogen dioxide (NO2), and suspended particles near roadways. Options are available for modeling near intersections, parking lots, elevated or depressed freeways, and canyons.

 

2

CAL3QHC

 

The CAL3QHC model estimates total air pollutant concentrations (CO or PM) near highways from both moving and idling vehicles. This model also estimates the length of queues formed by idling vehicles at signalized intersections.

 

3

CAL3QHCR

 

The CAL3QHCR model is an enhanced version of CAL3QHC, that can process up to a year of hourly meteorological data.  Vehicular emissions, traffic volume, and signalization (ETS) data can be specified for each hour of a week.

CALRoads View Main Features

Integrated Graphical Interface

Integrated Graphical Interface

Fully integrated interface combining easy to use graphical tools (e.g., roadway links, and receptors), seamless model run, and automated contouring and posting of results.

Support for Three Traffic Models

Support for Three Traffic Models

CALRoads View supports three US EPA traffic models in one seamless interface:, CALINE4, CAL3QHC, and CAL3QHCR. Change models in your project with the click of a button.

see models specs

Contouring Options

Contouring Options

A wide range of contouring options and controls are available, making it easy to present your results just the way you want them

Unlimited Receptors

Unlimited Receptors

CALRoads View allows you to run a project with an unlimited number of receptors, avoiding the restrictions imposed by the models. You can specify a Cartesian receptor grid, discrete receptors, and receptors along the roadways.

Several Link Types

Several Link Types

CALRoads View offers the ability to model free-flow traffic, intersections, parking lots, street canyons, traffic patterns and different receptor configurations.

 

 

Meteorological Scenarios

Meteorological Scenarios

CALINE4: You specify the worst-case met conditions.

CAL3QHC: You can specify one or more sets of meteorological conditions to be analyzed.

CAL3QHCR: You can specify up to a full year of hourly met data.

Rammet View

Met Data Pre-Processor for CAL3QHCR

Rammet View, which is part of the CALRoads View package, allows you to pre-process meteorological data to be used with the CAL3QHCR model.

WRPLOT View

Met Data Visualization Tool - Windrose

WRPLOT View, which is part of the CALRoads View package, allows you to create windrose plots for your meteorological data. Options to manipulate the appearance of the windrose are available such as colors, petal size, grid sectors, etc.

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 8
  • 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)

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