Study maps greenhouse gas emissions to building, street level for U.S. cities

October 9, 2012

Arizona State University researchers have developed a new software system capable of estimating greenhouse gas emissions across entire urban landscapes, all the way down to roads and individual buildings. Until now, scientists quantified carbon dioxide (CO2) emissions at a much broader level.

Dubbed “Hestia” after the Greek goddess of the hearth and home, researchers presented the new system in an article published Oct. 9 in Environmental Science and Technology. Hestia combines extensive public database “data-mining” with traffic simulation and building-by-building energy-consumption modeling. Its high-resolution maps clearly identify CO2 emission sources in a way that policymakers can utilize and the public can understand. Hestia is a new software system capable of detailing greenhouse gas emissions. Download Full Image

“Cities have had little information with which to guide reductions in greenhouse gas emissions – and you can’t reduce what you can’t measure,” said Kevin Gurney, an associate professor in ASU’s School of Life Sciences, and senior scientist with the Global Institute of Sustainability. “With Hestia, we can provide cities with a complete, three-dimensional picture of where, when and how carbon dioxide emissions are occurring.”

The research team collected data from a wide variety of sources such as local air pollution reports, traffic counts, and tax assessor parcel information. The data is then combined within a modeling system for quantifying CO2 emissions at the level of individual buildings and street segments.

So far, scientists have applied Hestia to the city of Indianapolis, and work is ongoing for the cities of Los Angeles and Phoenix. They hope to ultimately map the CO2 emissions in all major cities across the United States, which accounts for nearly one-quarter of all global CO2 emissions. The Hestia research team believes this type of detailed emissions information will help determine what we as a society can do locally and globally about climate change.

“As a community, we must take a leadership role in sustaining our relationship with the environment,” said ASU President Michael M. Crow. “This research, and its implications for global engagement regarding climate change, is an exciting step forward. Hestia gives us the next tool we need to help policymakers create effective greenhouse gas legislation.”

“These results may also help overcome current barriers to the United States joining an international climate change treaty,” agreed Gurney, Hestia’s lead scientist. “Many countries are unwilling to sign a treaty when greenhouse gas emission reductions cannot be independently verified.” 

According to researchers, Hestia’s increased detail and accuracy will help cities, and possibly even other nations, identify where an investment in energy and greenhouse gas savings would have the greatest impact.

"Leading in sustainability is not easy; however, as mayor, I am committed to doing so," Phoenix Mayor Greg Stanton said. "Undoubtedly, Hestia will be a good tool to help us make more informed decisions as leaders in Phoenix and the Valley around issues of air quality, health and a sustainable future." 

Although climate change presents society with tough challenges, Gurney believes this new system enables concrete, positive steps towards mitigating the problem.

“Hestia offers practical information we can use to identify the most cost-effective ways to reduce emissions and track progress over time,” Gurney said. “Scientists have spent decades describing the seriousness of climate change. Now, we are offering practical information to help do something about it.” 

Purdue Showalter Trust, Knauf Insulation, and the National Institute for Standards and Technology funded the three-year Hestia project, which involved researchers Bedrich Benes and Michael Abdul-Massih from Purdue University's Department of Computer Graphics and Technology.

Hestia is part of a larger effort that combines information about emissions with ground and satellite-based measurements of atmospheric carbon dioxide concentration. It is now part of the INFLUX experiment in Indianapolis and is expected to complement NASA’s planned December 2013 launch of the Orbital Carbon Observatory satellite, which will measure the concentration of CO2 in the Earth’s atmosphere.

ASU's School of Life Sciences is an academic unit of the College of Liberal Arts and Sciences

Kevin Gurney, (765) 427-8680,, Arizona State University
Bedrich Benes, (765) 496-2954,, Purdue University


Sandra Leander

Assistant Director of Media Relations, ASU Knowledge Enterprise


ASU wraps up competition at Grand Canyon Invite

October 9, 2012

The Arizona State University cross country teams competed at the Grand Canyon Invitational in Buckeye, Ariz., Oct. 6, with the men taking third and the women finishing fourth.  

Josh Walker had what may have been the best race of his collegiate career, finishing second overall, covering the 8,000-meter course as Estrella Mountain Regional Park in 24:58.6 and finishing as the top finisher for the Sun Devils.  Download Full Image

Jeff Bickert, who finished in 25:11.1 to finish sixth among collegiate competitors, followed Walker. 

In his Sun Devil debut, junior college transfer Garrett Seawell closed strong to finish hot on Bickert’s heels in 25:17.3 for a seventh-place finish amongst collegiate runners.

Redshirt freshman Daniel Wong was next for the Sun Devils in 25:40.5 to finish 16th among collegiate runners while Andy Cannata rounded out the scorers for ASU with a 26th-place finish among collegians in 26:03.9. 

The Sun Devils finished in a point-scoring tie with Cerritos with 57 points, leading to the race having to go to the sixth-runner to decide second place.  Cerritos’ Oscar Contreras finished ahead of ASU’s sixth runner Jesus Rivera to knock ASU back to third overall.

Kayla Springford, who finished fifth overall in 18:36.3 over the 5,000-meter course, led the Sun Devils women.

Springford was followed by Alexia Velarde in 18:52.1 in sixth among collegiate runners with Shaina Corbin next in line as she finished 14th among collegiate runners in 19:13.7.

Sophomore Taylor Conway was next for the Sun Devils in 19:42.1 to take 26th among collegiate runners while Dalanne Bartlette rounded out the scoring with a 53rd-place finish amongst collegiate runners in 21:15.5.

Competing unattached, Carly Paracholski ran the fastest time of the day for the Sun Devils as she clocked a time of 18:34.7, which was the fourth-fastest time overall on the day. 

The Sun Devils return to action next weekend at the Wisconsin Invitational in Madison where the ASU ‘A’ teams be in competition as the team looks to earn valuable points towards an NCAA Championship bid.

Juno Schaser

Event coordinator, Biodesign Institute