- Complete Air Dispersion Modeling Suite

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BREEZE ROADS is a complete air dispersion modeling suite that includes CALINE4, CAL3QHC, and CAL3QHCR models. These air dispersion models are used within the software program to predict air quality impacts of carbon monoxide (CO), nitrogen dioxide (NO2), particulate matter (PM), and other inert pollutant concentrations from moving and idling motor vehicles at or alongside roadways and roadway intersections. BREEZE ROADS is used in conjunction with emissions data from MOBILE or other emissions models to demonstrate compliance with National Ambient Air Quality Standards (NAAQS), Federal Conformity Rules, the UK’s National Air Quality Strategy, and modeling for highway site and design selection.

Key Features

  • Estimate total air pollution concentrations from both moving and idling vehicles
  • Estimate queue lengths at intersections and the contribution of emissions from idling vehicles
  • Incorporate saturation flow rate, signal type, and arrival type data for intersection assessments
  • Calculate pollutant concentrations on at-grade roadways, depressed roadways, raised roadways, bridges, intersections, street canyon and bluffs, and parking structures
  • Includes the CALINE4, CAL3QHC and CAL3QHCR line source dispersion models and a traffic algorithm for estimating vehicular queue lengths at signalized intersections

BREEZE ROADS allows your productivity to skyrocket because it uses a streamlined approach. Whether you’re entering links or receptors, you enter it only once. What’s more, you can visualize your project right on your computer screen, allowing you to easily quality check your data and see your work. There is no better software tool to simplify this aspect of your job.

Key Features

  • Estimate total air pollution concentrations from both moving and idling vehicles
  • Estimate queue lengths at intersections and the contribution of emissions from idling vehicles
  • Incorporate saturation flow rate, signal type, and arrival type data for intersection assessments
  • Calculate pollutant concentrations on at-grade roadways, depressed roadways, raised roadways, bridges, intersections, street canyon and bluffs, and parking structures
  • Includes the CALINE4, CAL3QHC and CAL3QHCR line source dispersion models and a traffic algorithm for estimating vehicular queue lengths at signalized intersections

Basic Features

  • Calculate concentrations from historical hourly or user-specified meteorological data
  • Specify traffic and signalization data with up to seven different patterns
  • Distinguish between an urban or rural location
  • Import AutoCAD.DXF files, aerial photos, or other basemaps (.BMP files)
  • Create report-quality 2D, top-down, and 3D graphics
  • Create concentration contours using the enhanced output

CALINE4 Model

  • Calculates NO2 concentrations using the Discrete Parcel Method
  • Users may enter up to 15,000 sources and discrete receptors

CAL3QHC Model

  • Predicts air pollutant concentrations near highways and arterial streets due to emissions from motor vehicles operating under free-flow conditions and idling vehicles
  • Incorporates methods for estimating traffic queue lengths at roadway intersections
  • Users may enter up to 120 sources and up to 200 discrete receptors

CAL3QHCR Model

  • An enhanced version of CAL3QHC
  • Ability to process up to a year of hourly meteorological, vehicular emissions, and traffic volume and signalization data in one model run
  • Calculates 1-hour and running 8-hour averages of CO, or 24-hour and annual block averages of PM
  • Users may enter up to 200 sources and up to 1,000 discrete receptors

Hardware
  • Intel or AMD processor, 32 bit. 500-megahertz (Mhz) or higher
  • 256 megabytes (MB) RAM, 512 MB RAM recommended
  • 100 (MB) available disk space for the application install. Meteorological or other data files may require significantly more
  • 1024 x 768 minimum display resolution
  • Mouse or other pointing device
Software
  • Windows 10, Windows 8, Windows 7 or Windows Server 2008
Additional Requirements
  • Meteorological data (optional)

CALINE Series of Models

Most mobile source dispersion models predict air pollution concentrations near roadways resulting from motor vehicles traveling under free-flow conditions. BREEZE ROADS is an enhanced version of the CALINE4, CAL3QHC, and CAL3QHCR series of models that incorporates methods for estimating queue lengths and the contribution from idling vehicles.

CALINE4 Model

CALINE4 is a line source air quality model developed by the California Department of Transportation (Caltrans). It is based on the Gaussian diffusion equation and employs a mixing zone concept to characterize pollutant dispersion over the roadway.

The purpose of the model is to assess air quality impacts near transportation facilities. Given source strength, meteorology and site geometry, CALINE4 can predict pollutant concentrations for receptors located within 500 meters of the roadway. In addition to predicting concentrations of relatively inert pollutants such as carbon monoxide (CO), the model can predict nitrogen dioxide (N02) and suspended particle concentrations. It also has special options for modeling air quality near intersections, street canyons, and parking facilities.

  • Include similar model theory as is in CAL3QHC, but has an advanced method for calculating NO2 concentrations using the Discrete Parcel Method
  • Predict pollutant concentrations for receptors located
  • Compute NO2 concentrations without the need for an external background concentration file
  • Ability to model the standard five roadway types (at-grade, depressed, fill, bridges, and intersections), as well as street canyons, bluffs, and parking lots

Users have the option to select between using the CALINE4, CAL3QHCR, and CAL3QHC models in the Control Options dialog box. Each model requires that certain parameters are entered in order to complete a model run.

CAL3QHC Model

The CAL3QHC model is a roadway model that predicts air pollutant concentrations near highways and arterial streets due to emissions from motor vehicles operating under free-flow conditions and idling vehicles. In addition, CAL3QHC incorporates methods for estimating traffic queue lengths at roadway intersections.

BREEZE CAL3QHC permits the user to specify roadway links and receptor locations within an XYZ plane. The Y-axis is aligned due north, with wind angle inputs to the model following accepted meteorological convention (e.g. 270E represents a wind from the west). The positive X-axis is aligned due east. A link can be specified as either a free flow or a queue link. The program automatically sums the contributions from each link to each receptor. Surface roughness and meteorological variables (such as atmospheric stability, wind speed, and wind direction) are assumed to be spatially constant over the entire study area.

When selecting the CAL3QHC model, users are prompted to enter the averaging time and pollutant.

CAL3QHCR Model

The CAL3QHCR model is an enhanced version of CAL3QHC. This version can process up to a year of hourly meteorological, vehicular emissions, and traffic volume and signalization data in one model run. In addition, 1-hour and running 8-hour averages of CO or 24-hour and annual block averages of PM can be calculated. CAL3QHCR can also be used as an analysis tool for high concentration episodes or for examining the effects that changing meteorology and traffic conditions have on concentrations. Other features include:

  • Conduct daily to seasonal runs with the CAL3QHCR model
  • Use a two-tiered approach to process data according to the day of the week
  • Produce output that provides a detailed synopsis of MET and traffic conditions on air quality

When selecting CAL3QHCR, users are prompted to select the pollutant and identify traffic patterns.

Additional Functions and Capabilities

More information on the various functions and capabilities of the CALINE4, CAL3QHC, and CAL3QHCR models can be seen in the tables below:

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