- Mobile Source 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

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:

Roadways

Using BREEZE ROADS, users can tailor their analyses for a wide variety of scenarios by picking and choosing from the many advanced features this product has to offer. BREEZE ROADS gives users the ability to estimate queue lengths and emissions contributions from idling and moving vehicles on various types of roadways. A two-tiered approach is also employed in CAL3QHCR that allows for emissions, traffic volume, and signalization to be varied by day of the week.

Roadways

BREEZE ROADS includes the CALINE4, CAL3QHC, and CAL3QHCR line source dispersion models and a traffic algorithm for estimating vehicular queue lengths at signalized intersections. CAL3QHC and CAL3QHCR are enhanced versions of the CALINE3 model that incorporates methods for estimating queue lengths and the contribution of emissions from idling vehicles. BREEZE ROADS will estimate the total air pollution concentrations from both moving and idling vehicles.

Roadway Types

BREEZE ROADS has the ability to calculate pollutant concentrations on at-grade roadways, depressed roadways, fill (raised roof) roadways, bridges, intersection or queuing links, street canyons, bluffs, and parking lots. A two-tiered approach using the CAL3QHCR module allows for a variation of emissions, traffic volume, and signalization data depending on the day of the week.

Users have the option to choose from a variety of roadways, and can easily draw these roadways on the base map using CAD-like drawing tools.

Meteorology

BREEZE ROADS calculates concentrations from historical hourly or user-specified meteorological data. The user-friendly interface makes entering or loading your meteorological data easier than ever. Also, the CALINE models incorporated into BREEZE ROADS enable users to model a single hour of user-defined meteorological data, or historic, hourly meteorological data. With this flexible, streamlined approach, productivity skyrockets!

Meteorological Options

BREEZE ROADS incorporates three modules; two for modeling a single hour of user-defined meteorological data (CAL3QHC and CALINE4) and a third for modeling historic, hourly meteorological data (CAL3QHCR). The latter module has the capability of processing a year of hourly meteorological data, carbon monoxide (CO), particulate matter (PM), or nitrogen dioxide (NO2) emissions, traffic, and signalization data. In addition, the CAL3QHCR module incorporates the Industrial Source Complex (ISC) mixing height algorithm. The BREEZE ROADS version of CAL3QHCR has additional enhancements to account for NOx to NO2 conversion. These enhancements are based on the algorithms in the CALINE4 model.

Users can define the meteorological conditions for their model run by copying and pasting values into the dialog box from an external table, or by simply entering the values into the dialog box.

When choosing the CAL3QHC or CALINE4 model, users are prompted to define the meteorological data conditions, as well as the site characteristics. The required meteorological conditions vary for each model, however, for the site characteristics in both models, users can enter a value for the roughness length, or select a value from the built-in list of typical values for a variety of surfaces.

CAL3QHCR Two-Tiered Approach

Flexibility has been built into the CAL3QHCR module of BREEZE ROADS to allow for a two-tiered approach. In the first approach, called Tier I, a full year of hourly meteorological data are entered into CAL3QHCR in place of the single hour of artificial meteorological data that are commonly entered into the CAL3QHC and CALINE4 modules. One hour of emissions traffic volume (ETS) data is also entered, just as in the CAL3QHC module. In the second approach, called Tier II, the same meteorological data is used as in a Tier I approach. The ETS data, however, are more detailed and reflect traffic condition for each hour of a week.

CAL3QHCR reads the ETS data as up to 7 sets of hourly ETS data (in the form of diurnal patterns) and processes the data into a week of hourly ETS data. The weekly ETS data are synchronized to the day of the week of the meteorological data year. The weekly traffic conditions are assumed to be the same for each week throughout the modeled period.

CAL3QHCR requires that users upload a meteorological file, identify the data period, and describe the site characteristics. As with the CAL3QHC and CALINE4 models, for the site characteristics users can enter a value for the roughness length, or select a value from the built-in list of typical values for a variety of surfaces.

Additional Met Features

Background concentrations can be included or excluded from a given model run. In a Tier II approach, background concentrations can be varied by hour of the day. If modeling NO2 in CAL3QHCR, an external ambient background file is required that contains ambient concentrations of O3, NO, and NO2. BREEZE ROADS includes a tool to generate this file.

Sources and Receptors

Whether you’re entering links or receptors, you enter them only one time. BREEZE ROADS gives users the ability to enter data by copying and pasting from an external spreadsheet to the data table within the software. This product also features CAD-like drawing tools enabling users to edit, move, and delete sources and receptors seamlessly. Additional productivity features for entering sources and receptors include the onsite receptor removal option, integrated unit conversion, unlimited receptors grids, unlimited sources, and unlimited source groupings.

Sources and Receptors

BREEZE features CAD-like drawing tools that make it easy to edit, move, and delete sources and receptors. You can view model input data in 2D. Intuitive form and table views of data also provide for easy data entry and customization of units. All model parameters are supplemented with complete online help, which provides definitions and acceptable ranges.

BREEZE makes it easy to create and execute projects and avoid costly data entry mistakes. You can easily import and use an AutoCAD .DXF file of a plot plan, facility map, or a digital line graph (DLGs) of local transportation and hydrography features; or, a bitmap image of an aerial photograph as project base maps. This makes it easy to digitize source, building, and property line locations within BREEZE.

BREEZE ROADS has the option of creating separate source and receptor files to save you time and give you flexibility when making multiple runs. You can also share model input data with other applications using AutoCAD .DXF and Windows bitmap image (.BMP) files or standard Windows “cut and paste” capabilities.

Users can add receptors by entering information in a table format, or by using CAD-like drawing tools to place the receptors on the base map. Using these same methods, users can easily enter information on the sources.

Wide Variety of Sources and Receptors

Using CALINE4 and CAL3QHC the user may enter up to 120 sources, and using CAL3QHCR the user may enter up to 200 sources. BREEZE ROADS allows for a larger number of receptors to be entered, with up to 200 discrete receptors allowed in CALINE4 and CAL3QHC and up to 1000 discrete receptors allowed in CAL3QHCR.

BREEZE ROADS enables users to enter multiple sources and receptors in a single model run. Users also have the ability to change the background color of their base map depending on their preference.

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)

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