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Darrell Sonntag

Assistant Professor
Full-Time Faculty

430-E EB
Provo, UT 84602


Darrell Sonntag joined the BYU Civil & Construction Engineering faculty in April 2022. For the previous 12 years, he conducted research and worked as an engineer at the US Environmental Protection Agency’s Office of Air Quality & Transportation. At the US EPA, his primary role was working with other engineers and scientists in developing a vehicle emissions model, the Motor Vehicle Emission Simulator (MOVES), used to estimate the air quality and greenhouse gas impacts of regulations and policies on vehicle emissions. At BYU, Darrell is conducting measurements of vehicle emissions and indoor air quality and modeling the environmental impacts of transportation systems.

Darrell is excited to join students at BYU in pursuit of truth through both science and faith. During his time as a BYU student, Darrell served in the Italy Rome Mission of the Church of Jesus Christ of Latter-day Saints from 2000-2002. He enjoys camping, hiking, biking, and cross-country skiing with his family.

Research Interests

Climate change and air quality impacts of transportation
Vehicle emission measurements
Vehicle emission models
Air quality improvement strategies
Indoor air quality
Statistical and data science

Teaching Interests

Sustainability in civil and construction engineering
Climate change and air quality impacts of transportation
Environmental and transportation engineering
Statistics and data science


  • PhD, Civil and Environmental Engineering , Cornell University (2010)
  • Master of Science, Transportation Systems Engineering , Cornell University (2008)
  • Bachelor of Science, Civil Engineering , Brigham Young University (2005)

Professional Citizenship

  • Officer, Great Basin Chapter of the Air and Waste Management Association (2024 - 2024)
  • Other, Utah Department of Transportation (2022 - 2023)
  • Reviewer, Ad Hoc Reviewer, US Environmental Protection Agency (2023 - 2023)

Courses Taught


Claudia Toro Darrell B Sonntag Jesse Bash Guy Burke Benjamin N Murphy Karl M Seltzer Heather Simon Mark W Shephard Karen E Cady-Pereira Darrell B Sonntag Hanyong Jung Royce P. Harline Tyler C. Peterson Selah E. Willis Taylor R. Christensen James D Johnston Benjamin N. Murphy Darrell B Sonntag Karl M. Seltzer Havala O. T. Pye Chrstine Allen Evan Murray Claudia Toro Drew R. Gentner Cheng Huang Shantanu Jathar Li Li Andrew A. May Allen L. Robinson Chen Zhang Karen Ficenec Andrew Kotz Kenneth Kelly Darrell B Sonntag Carl Fulper Jessica Brakora Tiffany Mo Sudheer Ballare Claudia Toro Kristen Foley Heather Simon Barron Henderson Kirk R Baker Alison Eyth Brian Timin Wyat Appel Deborah Luecken Megan Beardsley Darrell B Sonntag Norm Possiel Sarah Roberts


Darrell B Sonntag Hanyong Jung Royce P. Harline Tyler C. Peterson Selah E. Willis James D Johnston
Amber Allen Braxton Porter Ellie Mills Darrell B Sonntag
Darrell B Sonntag Braxton Porter Amber Allen Ellie Mills
Darrell B Sonntag
Tyler Christensen Paula Chanthakhoun Alisandra Olivares James D Johnston Darrell B Sonntag
Braedon Tarone Seth Van Roosendall James D Johnston Darrell B Sonntag
Pablo R. Harline Selah E. Willis James D Johnston Darrell B Sonntag
Ben Murphy Darrell Sonntag