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Air Quality Management

Since 1972, ICF International has provided air quality management and atmospheric sciences consulting services to a broad range of clients. We specialize in using creative analytical techniques and computer models to solve air pollution problems faced by the public and private sectors nationally and internationally.

The Urban Airshed Model (UAM), developed and maintained by ICF International, is the most widely used photochemical air quality model in the world today. We have worked with virtually all the major oil companies and automobile manufacturers in evaluating the effects of alternative and reformulated fuels on air quality, and have helped local, state, and federal agencies evaluate the air-quality impacts of transportation systems. ICF International regularly assists utilities in conforming with Clean Air Act regulatory requirements and in analyzing the effects on air quality and utility operations, including the trading of SO2 emission allowances.

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Environment News
ICF Awarded New Contract Valued at $42 Million with EPA's Clean Air Markets Division
Framework Contract Valued at Up to €10 Million to Advise European Commission's Environment DG on Atmospheric Policy
Analysis Highlights the Potential Role of Transportation Demand Management Strategies in Reducing Air Pollution
US$6 Million Contract to Administer New York Region's Ozone Action Days Program
US$10 Million Contract to Support U.S. EPA Ozone Protection Initiatives
Less Volatile Carbon Dioxide Prices Forecast in the EU in
2008-2012
Largest Purchase of Renewable Power by Consulting Sector
Awards
Environmental Business Journal Silver Medal for Business Achievement
Environmental Finance Best Carbon Advisory Company
Best Advisor on the EU Emissions Trading Scheme
Environment Publications
Cooling Down Hot Air
Curbing Carbon Dioxide with Cutting Edge Supply Chain Partnerships
Emissions Trading: Aviation's Next Steps
International Opportunities for Cost-Effective Reductions of Methane Emissions
Emissions: Where Are the Traders?
Emissions Trading and EU Power Markets: Allowance Allocation—The Critical Determinant of Value
From Legislation to Regulation: U.S. EPA's Proposed Clean Air Interstate & Mercury Rules Affect Electric Power Industry
Greenhouse Gas Legislation: California Global Warming Solutions Act of 2006
Mandatory Reporting on Environmental, Social, & Community Issues in the United Kingdom: The New Operating & Financial Review (OFR)
Operating and Financial Review-
Millstone or Stepping Stone?
The Price of Carbon in
2008-2012: Scenarios for Investment Appraisal
Transportation Demand Management Programs as an Emissions Reduction Strategy:
New Challenges and Opportunities
Winning in the European Greenhouse Gas Emissions Trading Scheme: Insights for Power Generators
Downloads
Air Pollution Control Technology Assessment
Air Toxics Risk Assessment
Alternative Fuel, Advanced Technology, and Vehicle Expertise
Average Displaced Emissions Rate (ADER): Approach and Methodology
Climate Options: Carbon-Neutral Growth
Creating Credible Greenhouse Gas Registries
Emissions Trading: Are You Cleared for Takeoff?
Environmental Products and Services for the Energy Industry
International Environmental Services
Managing Carbon Constraints in the European Union
Multi-Pollutant Compliance Strategy for the Energy Industry
Get free Acrobat Reader Selected Projects Selected Clients Models

SELECTED PROJECTS
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SELECTED CLIENTS
  • American Petroleum Institute
  • California Air Resources Board
  • California Department of Transportation
  • Colorado Department of Health
  • Florida Department of Transportation
  • Georgia Department of Natural Resources
  • Houston-Galveston Area Council
  • Las Vegas Department of Comprehensive Planning
  • Louisiana Department of Environment Quality
  • Maine Department of Environmental Protection
  • Maricopa Association of Governments (Arizona)
  • Maryland Department of Environmental Protection
  • Massachusetts Department of Environmental Protection
  • Minnesota Pollution Control Agency
  • Missouri Department of Natural Resources
  • National Research Council
  • National Transit Institute, Federal Highway Administration
  • Olympic Air Pollution Control Authority (Washington State)
  • Puget Sound Regional Council (Washington State)
  • Richmond Chamber of Commerce (Virginia)
  • Texas Natural Resources Conservation Commission
  • U.S. Environmental Protection Agency
  • U.S. Postal Service
  • Utah Air Quality Division
  • Virginia Department of Transportation
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MODELS
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DETAILS OF SELECTED PROJECTS
U.S. Emission and Fuel Markets Outlook

ICF International's U.S. Emission and Fuel Markets Outlook is the only fully integrated view of emission and fuel markets available. The study provides market analysis and price projections for all of the key emission and fuel market benchmarks to help decision makers understand the new fundamentals of the increasingly complex energy markets. Companies can customize their study by purchasing an individual chapter, multiple chapters, or the entire integrated study. The comprehensive study is based on more than 15 years of allowance forecasting experience, 30 years of power and fuel market forecasting experience, and ICF's preeminent fuel, power, and emission forecasting platform—the Integrated Planning Model (IPM®) .

SO2 Allowance Market Studies, for Multiple U.S. Electric Utilities

Since 1991, ICF International has conducted extensive SO2 allowance studies for most of the largest electric utilities in the United States. Our studies provide utility planners with a guide to future allowance prices and allowance price risk. We estimate SO2 allowance prices through 2020; predict the effects of economic, regulatory, and technical uncertainties on prices; analyze the interrelationship of prices, utility compliance plans, and emission control costs; and forecast interregional emission trades, principal buyers and sellers, and pollution control equipment.

Ozone-Reduction Strategies, for Southern U.S. Electric Utility

ICF International investigated the costs and economic impacts of various strategies for reducing ground-level ozone in the Atlanta, Georgia, metropolitan area. Strategies investigated included an enhanced vehicle inspection and maintenance program, reformulated gasoline, the scrapping of high-emitting vehicles, the adoption of a low emission vehicles program, and the application of selective catalytic reduction to coal-fired power plants. For each alternative, ICF International estimated reductions in nitrogen oxides and hydrocarbon emission, and costs. These estimates were fed into a regional economic model to determine the impacts in terms of employment and total economic output.

Emission Control Planning, for American Electric Power and Tennessee Valley Authority

ICF International developed and evaluated alternative capacity, dispatching, fuel choice, and pollution control plans to meet emission-reduction requirements for SO2 and NOx. In addition, CO2 emissions also were evaluated. In addition, ICF International forecasts future emissions for various alternatives in a capacity expansion plan it developed.

Salt River Project Navajo Generating Station Emissions Analysis

On behalf of the Salt River Project and the other owners of the Navajo Generating Station, ICF International adapted, evaluated, and applied a deterministic air-quality simulation model to calculate the sulfate impacts of this power plant at various receptor sites in the Grand Canyon. The model has five principal components: a transport (prognostic) meteorological model, an Eulerian dispersion model, a gas-phase chemistry submodel, a cloud chemistry/physics submodel, and a deposition submodel. Results of the modeling analysis have been used to determine improvements in Grand Canyon visibility due to control of the Navajo Generating Station.

Auto/Oil Air-Quality Improvement Program, for Coordinating Research Council

Initiated by three automobile companies and 14 petroleum companies, this cooperative research program is examining emissions from old vehicles (1983-1985) and newer vehicles (1989) that are fueled with various blends of reformulated gasoline. Many of the tasks have focused on improving the MOBILE and EMFAC emissions models.

Roadway Intersection Air-Quality Modeling, for the National Research Council

ICF International is the prime contractor for a project designed to improve models for estimating microscale CO concentrations due to mobile source emissions. Through data analysis, field studies, and model development, this multistage project is leading to more accurate predictions of CO concentrations around intersections at heavily traveled roadways. Factors investigated have included vehicle class, vehicle technology, average speed, instantaneous speed on acceleration, time at or near idle, and engine catalyst temperature. The overall purpose is to develop an integrated model that gives reliable CO impact assessments of major highway projects.

Transportation Conformity Analyses for Richmond and Hampton Roads Ozone Non-Attainment Areas, for Virginia Department of Transportation

ICF International performed the transportation conformity analysis for the Richmond and Hampton Roads, Virginia, ozone non-attainment areas. Work completed for this extensive project included development of model inputs, calculation of mobile source emission factors, modeling of regional emissions of VOC and NOX, and development of graphical summaries using in-house GIS tools.

Conformity Analyses for the U.S. Postal Service

ICF International prepared general conformity de minimis calculations and other air quality analyses for proposed postal facilities. This included analyzing mobile and stationary source emissions resulting from the construction and operation of proposed facilities, developing spreadsheet models to estimate potential emissions, and preparing air quality/conformity reports for each proposed facility. More than 50 facilities have been addressed under this effort.

Emission Impacts of Transportation Control Measures, for Houston-Galveston Area Council

ICF International developed a system for analyzing the travel activity and emissions impacts of transportation control measures (TCMs) and other transportation projects in the update to the 2020 Metropolitan Transportation Plan. The toolbox system integrates the regional and subregional analysis capabilities of the EXPLORA model with a PC-based system that analyzes the effects of individual TCMs and also estimates the impacts of implementing groups of TCMs as "packages." Included is an interactive database that can be used for organizing and accessing a wide variety of transportation project data.

PM10 Redesignation for Thurston County Non-Attainment Area, for the Olympic Air Pollution Control Authority

The Olympic Air Pollution Control Authority has been working to produce a formal, EPA-approvable way to show that Thurston County has attained the PM10 air quality standards. ICF International developed a work plan to identify all of the elements that must be addressed within a maintenance plan to support a redesignation request under the Clean Air Act. After developing a technical analysis protocol to identify emission inventory and modeling procedures, ICF International began developing a maintenance plan. This plan provides gridded emission inventories, dispersion modeling, performance evaluation, and contingency measures.

Emission Inventory for Maricopa County Non-Attainment Area, for the Maricopa Association of Governments

ICF International improved and updated the 1994 base year regional emission inventory for Maricopa County, Arizona, in connection with the reclassification of this area for non-attainment of the PM10 standard. Improved data for PM2.5 and wood-burning emissions, and updated spatial surrogate data such as the amount and distribution of construction areas, were included in the regional inventory. The improved data then were entered into a database and used to compile a regional PM10 emission inventory following U.S. EPA emission factors and procedures.

UAM Application to State Implementation Plan Development for Various States

ICF International performed studies involving the application of the Regional Oxidant Model and the Urban Airshed Model to Baltimore, Boston, and Detroit. Issues addressed included the meteorological conditions leading to ozone episodes; the importance of the initial and boundary conditions in simulating these episodes; the importance of horizontal resolution; and the relative importance of the terrain-modified, 3-D wind field. ICF International found that the preparation and use of a higher resolution wind field using the Diagnostic Wind Model provided superior UAM results over those using ROM-derived winds. The Baltimore, Boston, and Detroit studies helped the sponsor states develop their individual State Implementation Plans.


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DETAILS OF MODELS

Urban Airshed Model (UAM)
Having undergone nearly continuous cycles of improvement since its initial development in the 1970s, the Urban Airshed Model remains the most widely used photochemical air-quality model in the world today. It has been applied to 26 cities in the United States and 9 cities abroad, including Athens, Turin, Taipei, Kaohsiung, Tokyo, Mexico City, Melbourne, Lyon, and London. The most recent version, UAM-V, is a variable grid model that offers enhancement over UAM-IV, the model recommended by U.S. EPA for regulatory analyses and support of policy decisions related to ozone abatement. The UAM is supported by comprehensive systems for preprocessing of data for inputs and for postprocessing of outputs to allow for statistical and graphical analysis. For more information, visit the Support Center for Regulatory Air Models.

Caltrans Direct Travel Impact Model (DTIM3)
ICF International recently completed development of its fourth update of the California Department of Transportation (Caltrans) Direct Travel Impact Model (DTIM3), which currently is being tested by local planning agencies. DTIM links the vehicle activity estimates obtained from transportation models (e.g., EMME/2, MINUTP, or TRANPLAN) with emission rates from either the California EMFAC7G or the U.S. EPA MOBILE5b model to produce spatially and temporally resolved mobile source emission inventories. These inventories can subsequently be processed for use in the Urban Airshed Model using standard emissions processing software, or be used directly in transportation planning and conformity analyses. ICF International is very familiar with DTIM because we developed three previous PC- and workstation-based versions of the model.

DTIM makes possible several improvements over standard procedures for developing on-road vehicle inventories and, while conforming to EPA guidelines, goes several steps beyond them in its ability to use detailed information on vehicle activity patterns and regional meteorology. For example, hourly, gridded estimates of ambient temperature can be used within DTIM in choosing temperature-corrected emission rates. This is important when planning decisions must be made for large regions that may have significant differences in local temperature. By calculating hourly emissions, DTIM provides planners with more understanding of the impact of network congestion during peak conditions, and allows analysis of mitigation measures, such as flexible work schedules.

DTIM also calculates explicit trip-end emissions (e.g., cold starts), a feature that is necessary for properly evaluating the impacts of many types of TCMs, such as ride-share programs. DTIM includes options for recalculating hourly road segment speeds based on the level of roadway congestion, and algorithms to predict the effects of signalization and queuing on vehicle speeds and emissions. DTIM works on both PCs and workstations, requires no additional software licenses, and is fully documented, which makes it a convenient and inexpensive tool for regional planning agencies. ICF International has conducted DTIM training courses throughout the country for staff from local and state transportation and air-quality planning agency personnel, as well as EPA and FHWA.

Assessment System for Population Exposure Nationwide (ASPEN)
The Clean Air Act identifies 189 hazardous air pollutants (HAPs), which are associated with a wide range of adverse human health effects. In order to gain a greater understanding of the spatial distribution of concentrations of these HAPs resulting from the contributions of multiple emission sources, EPA conducted a modeling study using the ASPEN model. Features of this ICF International model include the following:

  • dispersion module to estimate ambient concentration increments at a set of fixed receptor locations in the vicinity of an emission source (i.e., the receptor grid)
  • mapping module to interpolate ambient concentration increment estimates from the grid receptors to census tract centroids and to sum contributions from all modeled sources
  • exposure module to estimate the average concentration increment to which the population of a census tract is exposed, accounting for time spent in indoor and outdoor micro-environments and time spent in other census tracts

Attainment Strategies Assessment Package (ASAP)
This ICF International model identifies the most cost-effective emissions control strategies for reducing urban ozone concentrations to levels below the threshold value of interest, normally the NAAQS threshold. ASAP employs the Urban Airshed Model simulations combined with data on costs of control measures in a mathematical optimization framework. ASAP consists of two main components:

  • ASAP Ozone Attainment/Control Space Mapper, which provides air-quality planners with an overview of the types of emission controls that will most effectively reduce ozone;
  • ASAP Control Cost Minimizer, which uses output from the Attainment/Control Space Mapper and region-specific information on control costs to identify the lowest cost control strategies
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