Available Tools
* coming soon
The Federal Highway Administration (FHWA) Office of Natural Environment developed a series of tools to provide technical support and resources for the implementation of the Congestion Mitigation and Air Quality Improvement (CMAQ) Program.
CMAQ project justification as well as annual reporting require the development of reliable air quality benefit estimates. Realizing that every potential project sponsor may not have the capacity for developing independent air quality benefit estimates, the FHWA has undertaken the initiative of developing a series of spreadsheet based tools to facilitate the calculation of representative air quality benefit data.
This CMAQ Emissions Calculator Toolkit (in Microsoft Excel format) is only offered as an additional resource to assist DOTs, MPOs and project sponsors in the project justification process. Agencies and individuals using a preferred methodology to generate air quality benefit information are welcome to continue their current practice. The tool kit will be released in modules by project type.
Help Line: If you have any questions or feedback about the Toolkit, please email CMAQ_Toolkit_Help@dot.gov
Use the cards below to explore the tools, documentation, and training.
Introduction
Traffic signal timings in adaptive traffic control systems (ATCS) can adjust to changing traffic environments based on traffic volume data collected by sensors deployed at individual intersections. This tool calculates emission reductions for projects that implement ATCS on a corridor with signalized intersections previously controlled by a time-of-day signal timing plan.
Original Release: Coming Soon
Latest Update: N/A
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Replacing convention fuels with alternative fuel types reduces transit emissions. This tool calculates emissions reductions from purchasing vehicles to replace a convention fuel fleet or developing new alternative fuel infrastructure with restricted or unrestricted access.
Original Release: May 2018
Latest Update: October 2019
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Bicycle and pedestrian infrastructure projects improve the quantity and quality of non-motorized trips, increasing the facilities' ease of use and encouraging mode shift. This tool calculates emission reductions from diverting trips from passenger vehicles to bicycle or pedestrian trips.
Original Release: August 2019
Latest Update: February 2020
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Carpooling and vanpooling encourage participants to commute together and reduce vehicle activity. This tool calculates emission reductions from projects that start carpool and vanpool programs, increase ridership in existing programs, or purchase vehicles for vanpool programs.
Original Release: May 2018
Latest Update: August 2019
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Reducing congestion and improving traffic flow along a roadway improves roadway performance and reduces emissions from passing vehicles. This tool calculates emission reductions from intersection improvements, traffic signal synchronization, and roundabout projects.
Original Release: July 2019
Latest Update: February 2020
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Idle reduction technologies are devices that enable diesel engine operators to refrain from long-duration idling of the main propulsion engine (referred to as "extended idle") by using an alternative power source. This tool calculates emission reductions from the application of idle reduction methods to diesel long-haul truck operations.
Original Release: November 2018
Latest Update: February 2020
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Engine retrofit technologies and newer model year engines reduce vehicle emissions. This tool calculates emission reductions from retrofitting a heavy-duty diesel vehicle with a retrofit technology or repowering/replacing the heavy-duty vehicle with a more recent model year.
Original Release: May 2018
Latest Update: March 2019
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Significant atmospheric dust arises from the mechanical disturbance of both paved and unpaved road surfaces by vehicle traffic. This tool calculates emission reductions from dust mitigation projects for paved roads, unpaved roads, or paving an unpaved road.
Original Release: February 2020
Latest Update: N/A
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Retrofit technologies and newer engine model years reduce emissions from locomotive and marine vessels. This tool calculates emission reductions from implementing engine retrofitting or engine repowering and replacement for locomotive and marine vessels.
Original Release: October 2020
Latest Update: N/A
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Managed lane (ML) facilities, such as high-occupancy vehicle (HOV) and high-occupancy toll (HOT) lanes, on freeways produce emission benefits through smoothing driving behavior, improving traffic flow, and increasing average travel speeds. This tool calculates emission reductions from construction of a new ML facility on a freeway or conversion of an existing lane to a ML.
Original Release: January 2020
Latest Update: N/A
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Emission reduction technologies and newer or alternative fuels reduce transit emissions. This tool calculates emission reductions from retrofitting diesel transit buses with emission reduction technologies or replacing diesel and compressed natural gas (CNG) transit buses (or engines) with newer diesel, CNG, or alternative fuel
Original Release: May 2018
Latest Update: September 2019
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
Introduction
Increasing transit bus service and expanding transit bus fleet sizes encourages decreased passenger vehicle activity. This tool calculates emission reductions from diverting use of passenger vehicles to transit buses.
Original Release: May 2018
Latest Update: November 2019
Help Line
For help using this tool or to provide feedback, please email: CMAQ_Toolkit_Help@dot.gov
