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New University of Utah study shows how outdoor pollution affects indoor air quality

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New University of Utah study shows how outdoor pollution affects indoor air quality


SALT LAKE CITY — Ever heard of an air economizer? It’s something some HVAC systems have, and a recent study The University of Utah found in certain conditions these systems could impact indoor air quality.

“We get different kinds of pollution events here, especially wildfire smoke, winter time inversions and dust,” said Kerry Kelly, Associate Professor in Chemical Engineering At The University Of Utah

The College of Engineering teamed up with facilities management to put their research into action throughout Salt Lake City’s campus. “We spend about 80% of our time indoors, we find that wildfire smoke has the biggest impact on indoor air quality,” said Kelly.

Kelly explained that one of the key takeaways was the type of HVAC system that impacts indoor air quality. “Something called an air economizer we found that under certain conditions those can really dry in a lot of wildfire smoke,” said Kelly.

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She explained what an air economizer does: “It’s more common on commercial buildings and it’s a really good strategy that can be really efficient. So, for example, you know it’s kind of hot here in the summer but at 3 o’clock in the morning the temperature is beautiful so at 3 o’clock in the morning, it can pull in more outdoor air because you spent a lot less energy conditioning.”

She explained it’s a good way to save energy, but not so great if it’s bringing in pollution.

So, what can you do then? “Particular matter sensors are pretty good. I mean it gives you a relative indication of what your indoor air quality,” said Kelly.

She also uses portable air filters, which you can find just about anywhere. “They can be really effective but if you decide to do one of these portable air filters, make sure that you only get air filtration. You just want a simple filtration device,” said Kelly.





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Utah man arrested again for allegedly abusing dog twice in three months

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Utah man arrested again for allegedly abusing dog twice in three months


EAGLE MOUNTAIN — An Eagle Mountain man currently on pretrial release in 4th District Court who is accused of abusing his dog has been arrested again for allegedly punching the same animal.

Keith Reaves Davis, 43, was booked into the Utah County Jail on Wednesday for investigation of aggravated cruelty to an animal.

Utah County sheriff’s deputies were called Wednesday afternoon to a grocery store on a report that a man was beating his dog after it had gotten off its leash and was stopped by a bystander, according to a police booking affidavit.

“I reviewed security camera footage from the grocery store, and an individual matching the description of the suspect was seen holding the dog in the air by one paw and repeatedly striking the dog on the right hind leg area. I observed the male strike the dog several times before dropping the dog from approximately 1-2 feet. The strikes appeared to be as hard as the male could hit,” the arresting deputy wrote in the affidavit. “The dog did not cry out or whimper as if the dog was accustomed to the abuse.”

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When questioned, Davis “admitted to striking the dog because it was not behaving,” the affidavit states.

An animal control officer who responded to the scene to take custody of the dog noted it was the same dog he had taken from Davis exactly three months earlier during another animal abuse investigation.

In that case, Davis was charged in 4th District Court with aggravated cruelty to an animal, a class A misdemeanor; and public intoxication, a class C misdemeanor, after deputies received a tip from a neighbor that a dog was being abused at Davis’ home, according to charging documents. When questioned, Davis “acknowledged hitting his dog as punishment,” the charges state.

Deputies also reviewed videos that the neighbor had filmed. The neighbor told investigators “there was blood from the dog on the ground of the garage and (the neighbor) can hear the dog screaming as if it’s being hurt. Deputies got the videos from the (neighbor) and you can hear very loudly the dog screaming and crying with a lot of loud banging noises. In one of the videos, you can hear the dog sounding like it is being choked by a collar and is grasping for air,” a police booking affidavit states.

Davis’ next court hearing in the April case is scheduled for July 28.

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In their latest booking report, sheriff’s deputies note that they “believe further harm will be inflicted on this dog if it is released back to the male a second time,” and have recommended the dog not be returned to Davis.

The Key Takeaways for this article were generated with the assistance of large language models and reviewed by our editorial team. The article, itself, is solely human-written.



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Muslim man stabbed at Utah mall over his religion, authorities say

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Muslim man stabbed at Utah mall over his religion, authorities say


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A man was arrested in Utah after allegedly stabbing a Muslim employee at a mall multiple times and telling investigators he targeted the victim because of his religion, according to court records. 

Peter Michael Larsen, 48, was booked into the Salt Lake County Jail on suspicion of attempted murder and prohibited dangerous weapon conduct following the attack on July 13 at the Valley Fair Mall in West Valley City, Utah, court and online jail records show. West Valley City is a suburb of Salt Lake City.

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The West Valley City Police Department said the incident occurred shortly before 3 p.m. local time, when Larsen approached a man working at a kiosk at the mall.

“After a brief interaction, the suspect pulled out a knife and began stabbing him multiple times,” police said in a statement on X. “A few bystanders interfered, and were able to separate the suspect from the victim and subdue the suspect until police arrived.”

The victim, who was not identified by authorities, sustained multiple stab wounds and was taken to a hospital in critical condition, according to police and court records.

Larsen told investigators that he had “targeted the victim with intent to kill him because of his religion (Muslim),” police said in an affidavit obtained by USA TODAY. The affidavit also states Larsen said he believes he is “a catalyst” and “intends to kill Muslims.”

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The incident remains under investigation, and police said they were looking into any possible relationship between the suspect and victim. USA TODAY reached out to the West Valley City Police Department for comment.

Police: Suspect poses a ‘substantial danger to the public’

The suspect approached the Muslim man, asked for his name, asked about his religion, and indicated he wanted a bottle of water, The Salt Lake Tribune reported, citing comments from Imam Shuaib Din, who leads the Utah Islamic Center and had been in contact with the victim’s family.

As the victim turned to get the water, the attacker began stabbing him, Din told the newspaper. Police said in the affidavit that they received multiple 911 calls at around 2:30 p.m. local time reporting two men “involved in a physical altercation where one male was stabbing the other.”

When officers arrived at the scene, they observed bystanders pinning the suspect to the ground and “had already removed the knife from his hand,” according to the affidavit. Police said the victim was “bleeding profusely” and was then transported to the hospital.

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The victim was identified by friends as Syed Sohail Uddin, local television station FOX 13 and The New York Times reported. A GoFundMe fundraiser organized on his behalf said he was stabbed 15 times and required multiple surgeries. 

Larsen was also transported to the hospital “due to being punched in the head from bystanders trying to get the knife out of his hand,” according to the affidavit. He was later medically cleared and taken to the police station for an interview.

Police said in the affidavit that Larsen posed “a substantial danger to the public if released based on his violent actions today, ideologies and pre-planned mass casualty events.”

Advocates condemn stabbing attack at Utah mall

Muslim advocacy groups, including the Council on American-Islamic Relations (CAIR), condemned the attack.

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“This horrific attack is yet another reminder that anti-Muslim rhetoric has real-world consequences. When Muslims are routinely demonized, portrayed as threats, or treated as less deserving of equal rights and dignity, some twisted individuals inevitably act on that hatred,” CAIR National Executive Director Nihad Awad said in a statement on July 14.

Civil rights advocates have noted a rise in Islamophobia in the United States over the last two-plus decades following the Sept. 11, 2001, attacks, ⁠and ​more recently because of immigration policies and the fallout of the Israel-Hamas war, according to Reuters.

CAIR, which is the nation’s largest Muslim civil rights and advocacy organization, reported last year that it received a record number of complaints of discrimination and Islamophobic attacks amid the war.

The organization received more than 8,650 complaints in 2024, the highest number since CAIR began publishing its annual civil rights report in 1996, according to the report released in March 2025. Complaints rose more than 7%, breaking the previous record set in 2023.

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The Utah attack follows several high-profile incidents targeting Muslims in recent years, including the fatal stabbing of a 6-year-old Palestinian American boy in Illinois in 2023 and a deadly shooting at a San Diego mosque earlier this year.

Contributing: N’dea Yancey-Bragg, USA TODAY; Reuters



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Muslim man in Utah was targeted in stabbing because of his religion, police say

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Muslim man in Utah was targeted in stabbing because of his religion, police say


A Utah man told police he repeatedly stabbed a Muslim man because of the man’s faith and intended to kill him, according to court records filed Monday.

The Muslim man survived the attack Monday afternoon at a mall southeast of Salt Lake City. But he’s expected to face a long recovery after suffering more than 15 stab wounds, according to a GoFundMe page set up to help with medical expenses.

Bystanders were able to get the knife out of the suspect’s hand before police arrived at the scene at Valley Fair Mall, court records show.

The suspect, Peter Michael Larsen, was arrested on suspicion of attempted murder and carrying a prohibited dangerous weapon. He told police he targeted the employee over his religious beliefs, according to the court records, which didn’t list an attorney who could comment on his behalf.

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The Associated Press was unable to locate any of Larsen’s immediate family in public records.

The Valley Fair Mall did not immediately respond to email and voicemail requests for comment.

Larsen, 48, was on parole for a previous violent felony, court records show. He is being held without bail.

Salt Lake County District Attorney Sim Gill, whose office is determining whether to pursue charges, declined to comment.

“We don’t want to say anything else until we receive the results of the investigation,” Gill said in a statement.

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The Council on American-Islamic Relations, a Muslim advocacy group, called on elected officials to reject anti-Muslim rhetoric.

“Our nation’s political and community leaders have a moral responsibility to reject anti-Muslim hate in all its forms before more innocent people are harmed,” Nihad Awad, the organization’s national executive director, said in a statement.

In May, two teenagers killed three people and then themselves at an Islamic Center in San Diego in an attack that has left the community reeling. The AP obtained writings of both teenagers, including hateful rhetoric toward Jewish people, Muslims and Islam, as well as the LGBTQ+ community, Black people, women, and both the political left and right.





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