236 Articles found
Trinity Consultants Articles
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Modeling for NAAQS Part 1: How to select the appropriate output for NO2
The U.S. National Ambient Air Quality Standards (NAAQS) for 1-hour SO2, 1-hour NO2, and 24-hour PM2.5 use a very particular format. It is very important for all modelers (both within and outside of the U.S.) to understand how AERMOD handles ...
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Modeling Tip: How to import model objects from AERMOD-related files into BREEZE AERMOD
BREEZE AERMOD provides modelers with the ability to import model objects from existing AERMOD related files. The supported files include EPA AERMOD and ISC input files (.dat), BREEZE AERMOD input files (.ami), source files (.pnt), receptor ...
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Modeling Tip: How to Import BREEZE AERMOD files into BREEZE Risk Analyst for Human Health Risk Assessments
Humans can be exposed to hazardous air pollutants (HAPs) either directly through inhalation or indirectly through ingestion or dermal contact, which can result in acute or chronic health effects. The risk of exposure varies depending on a number of ...
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Modeling Tip: How to Merge BREEZE Remote Modeling System’s Results with the Local .AMZ File and View Results in BREEZE AERMOD
The BREEZE Remote Modeling System (BRMS) is a Web-enabled application that executes AERMOD model runs in a fraction of the time they take on a desktop computer, thereby assisting modelers in reducing model runtimes on large or highly ...
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Modeling Tip: Importing a Map Image File into BREEZE AERMOD or 3D Analyst
Imported maps can be very helpful when setting up a model scenario and analyzing the results. They can be used as a QA/QC method for ensuring that model objects are in the correct locations and they can also help better visualize results ...
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Modeling Tip: Creating Animations in BREEZE 3D Analyst
The powerful post-processor, BREEZE 3D Analyst, enables you to analyze and visualize data in multiple formats to help you better understand, interpret, and summarize your modeling results. To best assist our users, a complimentary license of BREEZE ...
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Modeling Tip: Batch Scheduling and Restart Options in BREEZE AERMOD for Large Modeling Runs
Although the advanced physics in U.S. EPA’s AERMOD more accurately represent dispersion of pollutants in the atmosphere, it comes with the disadvantage of greatly increased model run times. Even for a comparatively small project containing a ...
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Modeling Tip: How Parallel Processing can Expedite Large AERMOD Model Runs
Due to advances in scientific knowledge, higher resolution raw data, stringent air quality standards, and changing regulations, environmental modeling is demanding more and more from EHS professionals and their computers. All of these influences ...
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Modeling Tip: Disabling Onsite and Offsite Receptors in BREEZE AERMOD
The type of modeling analysis you are conducting will determine if you are interested in the highest offsite or onsite pollutant concentrations. For example, if you are modeling to show compliance with the U.S. EPA National Ambient Air Quality ...
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Modeling Tip: Using Ozone File Editor Tools in BREEZE AERMOD
To model 1-hour and annual concentrations of NO2 for the National Ambient Air Quality Standard (NAAQS), the U.S. EPA has approved a three-tiered approach as detailed in Section 5.2.4 of EPA’s Guideline on Air Quality Models, Appendix W to 40 ...
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Modeling Tip: Using Hourly Emission File Editor in BREEZE AERMOD
BREEZE AERMOD includes numerous time-saving tools to help with setting up a modeling run. One of these tools is the Hourly Emission File Editor. This modeling tip explains how to use that tool to easily use refined hourly emission rate data in your ...
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Modeling Tip: How to Set Up Variable Density Receptor Grid in AERMOD
BREEZE is the market-leading air dispersion modeling software used by environmental professionals around the world Receptors are specific locations, set up in air quality dispersion models, where ambient concentration estimates or deposition values ...
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BREEZE is the market-leading air dispersion modeling software used by environmental professionals around the world
While most air dispersion modeling is conducted using meteorological data from recent past years and historical or projected emissions data, models can also be used with real-time or short-term forecast meteorological and emissions data to estimate ...
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Dispersion Notes: U.S. EPA Proposes Changes to AERMOD and CALPUFF
Last week, BREEZE staff made the trip to U.S. EPA’s offices in North Carolina for their 11th Modeling Conference to get the latest updates on upcoming changes to the AERMOD system, CALPUFF, and other issues. The highlights include: ...
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Modeling Tip: Using 3D Receptor Grid in AERMOD
Receptors are specific locations where AERMOD will compute a concentration or deposition value. In an AERMOD analysis, at least one receptor must be defined in order for the model to run successfully. To assist modelers in including receptors into ...
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A Cost-Effective Approach to Explosion Consequence Modeling
Failure to identify and mitigate explosion hazards is a persistent cause of industrial accidents, impacting sites ranging from fertilizer storage facilities to refineries. While some explosion consequence assessments are performed to comply with ...
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Onsite Meteorological Data - Everything You Need To Know
Most AERMOD dispersion modeling is conducted using meteorological data from a nearby airport. As long as the airport is reasonably representative of your source location, there is nothing wrong with that: airports are often a source ...
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What is Your Organization`s EHS Culture?
Each organization has a unique EHS culture. It is critical to understand and manage your organization’s EHS culture in order to maintain positive EHS performance. EHS performance is most often driven by employee actions and behaviors, which ...
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5 Reasons to Perform a Consequence Modeling Analysis for Your Facility
The potential for accidental release of toxic chemicals to the environment is a daily threat for many industrial facilities and plants. These releases can occur very suddenly and unexpectedly, putting employees and the public at risk of injury or ...
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Keeping the Increasing Complexity of Air Dispersion Modeling in Check
Driven by advances in scientific knowledge, tightening and constantly changing regulations, and higher-resolution raw data, environmental modeling is demanding more and more from EH&S professionals and their computers. AERMOD run times for large ...