zooming in on emissions

UH team unlocks innovative approach to pinpoint pollution factors

A University of Houston team looked into what areas in Houston had the highest impact on emissions and how certain meteorological factors play into ozone formation. Photo via UH.edu

A team of researchers at the University of Houston are using machine learning to help guide pollution fighting strategies.

As reported in the journal Environmental Pollution last month, the team used the SHAP algorithm of machine learning (a game theory approach) and the Positive Matrix Factorization to pinpoint what areas in Houston had the highest impact on emissions and how certain meteorological factors play into ozone formation.

The paper was authored by Delaney Nelson, a doctoral student at the Department of Earth and Atmospheric Sciences of UH, and Yunsoo Choi, corresponding author and professor of atmospheric chemistry, AI deep learning, air quality modeling and satellite remote sensing.

The team's research closely tracked nitrogen-based compound and volatile organic compound measurements from Texas Commission on Environmental Quality's monitoring stations in the Houston area. After importing measurements from The Lynchburg Ferry station in Houston's ship channel and the urban Milby Park station, the machine learning and SHAP analysis showed a chemically definitive difference between the two areas.

For example, at the industrial station, the most impactful sources of pollution were from oil and gas flaring/production. At the urban site n_decane and industrial emissions/evaporation had the most impact on ozone.

According to Nelson and Choi, this shows that the machine learning and SHAP analysis approach can be used to tailor more precise air quality management strategies in different areas based on the site's unique characteristics.

“Once we know the specific emission sources and factors, we can develop targeted strategies to reduce emissions, which will in turn reduce ozone in the air and make it healthier for everyone," Choi said in a statement.

“Pollution is a critical issue in Houston, where you have extreme high heat and high concentration of ozone in the summers. The types of insights we got are very useful information for the local community to develop effective policies. That’s why we put our time, effort and technological expertise into this project," he continued.

Next the team envisions applying their approach in different cities and across the country.

“Austin, San Antonio and Dallas all have different characteristics, so I expect (volatile organic compound) sources will also be different,” Choi said. “Identifying VOC sources in different cities is very important because each city should have its own unique pollution fighting strategy.”

This summer, the City of Houston released an updated report on its major strategies to combat climate change and build a more resilient future for its residents.

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A View From HETI

Tesla is expected to bring a 'megafactory' to Brookshire.

Tesla is expected to bring a “megafactory” and 1,500 manufacturing jobs to the Houston area.

According to various news reports this week, Tesla intends to spend $200 million on a facility in Brookshire, Texas. The Waller County Commissioners Court approved tax abatements on March 5 for the new plant.

“We are super excited about this opportunity—1,500 advanced manufacturing jobs in the county and in the city," Waller County Precinct 4 Commissioner Justin Beckendorff said during Wednesday’s Commissioners Court meeting.

Tesla will lease two buildings in Brookshire's Empire West Business Park. According to documents from Waller County, Tesla will add $44 million in facility improvements. In addition, it will install $150 million worth of manufacturing equipment.

As part of the deal, Tesla will invest in property improvements that involve a 600,000-square-foot, $31 million manufacturing facility that will house $2 million worth of equipment and include improvements to the venue.

The facility will produce Tesla megapacks, which are powerful batteries to provide energy storage and support, according to the company. A megapack can store enough energy to power about 3,600 homes for one hour.

Tesla can receive a 60 percent tax abatement for 10 years. According to the tax abatement agreement, Tesla has to employ at least 1,500 people by 2028 in order to be eligible for the tax break.

In addition to the employment clause, Tesla also will be required to have a minimum of $75 million in taxable inventory by January 1, 2026, which will increase to $300 million after three years.

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This story originally appeared on our sister site, InnovationMap.

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