Air quality in Utah

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Winter inversion obscuring view of distant Provo Canyon. Pollutants lead to low contrast near the base of the mountains.

Air quality in Utah is often some of the worst in the United States.[1][2] Poor air quality in Utah is due to the mountainous topography which can cause pollutants to build up near the surface (especially during inversions[2]) combined with the prevalence of emissions from gasoline- and diesel-powered vehicles, especially older models.[3][4] Burning wood fuel for home heating can also contribute significantly to poor air quality. Homes heated with wood contribute about 3000 times the amount of pollution as homes heated with natural gas.[4] About 50% of air pollution in Salt Lake County is from vehicles.[5]

In 2017 the American Lung Association (ALA) ranked Salt Lake City-Provo-Orem area as the 14th worst city for ozone air quality in the U.S. and 8th for worst short-term particle pollution, just after Los Angeles. Logan was ranked the 11th worst city for short-term particle pollution.[6] Of the 12 counties with ozone data from 2014 to 2016, 7 received an "F" grade by the ALA, and 6 of 9 counties monitored received an "F" for particulate pollution.[7] An MIT study estimated that over 450 deaths annually in Utah are due to poor air quality.[8]

Utah has had mixed responses to poor air quality. For example, from 2015 to 2016 the state offered up to a $1500 credit for clean fuel vehicles[9] However, in 2019 Utah began imposing an additional registration fee on clean fuel vehicles that will increase to $120 annually by 2021.[10]

Inversions and air quality[edit]

Winter inversion in the Salt Lake Valley seen from Grandeur Peak.

Due to the mountainous terrain and cold winters, inversions frequently occur in Utah and throughout the Intermountain West. While inversions are a natural phenomenon, when coupled with community emissions from gasoline and diesel vehicles, wood fires, industry, and agriculture they can cause unnatural accumulations of hazardous pollutants (especially PM2.5).[11][12][13] A typical winter in Salt Lake City has about 6 multi-day inversions that lead to about 18 days of pollution above National Ambient Air Quality Standards.[12][13] Pollution for inversions can begin to build-up even when the air is clear.[11]

To improve air quality, especially during inversions, there are restrictions on burning wood fires with fines starting at $150 for first-time offenses in Salt Lake County.[14] Emissions can be reduced by using gasoline and diesel vehicles less by more carpooling and taking public transit, less idling, use of newer vehicles (especially clean fuel vehicles), and combining trips.[14][15] Less use of gas-powered snow blowers, fireworks, gas-powered lawnmowers, and materials with high volatile organic compound emissions such as certain paints can help keep air clean throughout the year.

Pollutants, sources, and health concerns[edit]

This diesel-powered truck emits an exhaust gas rich in black particulate matter when starting its engine. Mobile sources, including both gasoline and diesel vehicles, are one of the leading contributors to poor air quality in Utah. Most hazardous mobile emissions are not as visible as in this picture.

Two pollutant measurements of highest concern for health are PM2.5 (or amount of fine particulates with diameters of 2.5 μm or less) of and ozone levels. PM2.5 is usually the pollutant of concern in winters in Utah, and ozone is the pollutant of concern in summers.[16] To try and reduce negative health effects of outdoor air quality in Utah, at risk groups (including the young, the elderly, and those who exercise outdoors)[17] are advised to stay indoors. School children in Utah have been kept inside during poor air quality events.[18]

Particulates, especially smaller ones such as PM2.5, can enter deep into the lungs to cause or worsen respiratory disease issues, and decrease lung function. Particulates can cross into the blood stream and cause irregular heartbeats, heart attacks, and strokes.[19] Particulates can also cross the blood–brain barrier and cause degenerative brain diseases such as Dementia and Alzheimer's, mental illness, and reduced intelligence.[20][21] PM2.5 is the largest component of Utah's wintertime pollution.[16][22] Particulates can be emitted either directly (primary) from sources like exhaust gas, wood fires and fireworks, or can form in the atmosphere (secondary) from chemicals emitted from VOCs like fuel and household products (like paints), and gaseous vehicle emissions of NOx.[16]

Ozone is helpful to block UV radiation when at high above the ground in the stratosphere. Ozone can damage mucous tissues such as lung linings, as well as vegetation.[16] Ozone can also form from reactions of VOCs or carbon monoxide and NOx. Exposure to higher levels of ozone during pregnancy has been linked with an increased risk of stillbirth, infant mortality, and brain disorders.[23]

PM2.5 and ozone levels are converted from scientific units (like μg m−3) to air quality index levels. The maximum AQI across a variety of pollutants is often what gets reported. The Utah DEQ publishes AQI levels.[24] Levels are aggregated into groups including "Good," "Moderate" (health concern for particularly sensitive people), "Unhealthy for Sensitive Groups" (including children, the elderly, and those with existing cardiovascular problems), with higher levels of "Unhealthy", "Very Unhealthy", and "Hazardous" affecting everyone.[17][25] AQI can be delayed by up to a day compared to current conditions.

A Utah Physicians for a Healthy Environment study estimated 1,000–2,000 deaths in Utah annually due to poor air quality.[26] An MIT study estimated 200,000 premature deaths occur in the U.S. each year as a result of poor air quality, with the most significant contribution from vehicles.[27] The study estimated 461 premature deaths in Utah annually due to high levels of ozone and particulate matter, with vehicle emissions leading to 147 of the deaths annually.[8] By comparison there were 273 deaths due to motor vehicle crashes in Utah in 2017.[28]

About 200 Utahans go to the hospital with severe pneumonia due to particulate pollution each year.[29] Emergency room respiratory-related visits in Salt Lake City increased by 40% during pollution episodes in 2014.[30]

Air quality related mortality in Utah.[8] NM = number of premature deaths. MR = mortality rate (deaths per 100,000 people)
Electric gen Industry Comm/Res Road Marine Rail
Pollutant NM MR NM MR NM MR NM MR NM MR NM MR
PM2.5 58 2.6 88 3.9 107 4.8 145 6.5 6 0.3 10 0.5
Ozone 9 0.42 6 0.27 1 0.06 27 1.21 1 0.05 3 0.13

Wildfires[edit]

Satellite imagery from August 4, 2018 showing smoke from California fires blowing eastward into Utah.

Wildfires from within the state, the Pacific Northwest, California, Idaho, Nevada, and even Arizona can drastically reduce air quality.

In August 2020 smoke drifted in from California fires which caused PM2.5 levels to exceed 90 mg m−3 in Cache County, Utah, over 2.5 as high as the federal threshold level of 35 mg m−3.[31] Researchers were concerned the poor air quality would worsen symptoms from COVID-19. Air quality in southern Utah was negatively affected by Veyo West and Turkey Farm Road Fires in Washington County as well as fires in Nevada.[32] Smoke from the Bush and Magnum fires in Arizona blew up into Utah in June 2020.[33]

In July 2021 high episodes of pollution were caused from the Bootleg Fire in southern Oregon, and the Beckwourth Complex Fire in northern California.[34][35] In Salt Lake County pollution levels reached the 'unhealthy category' and even the normally healthy population was at risk for negative health impacts.[36] On August 6 in Salt Lake City smoke originating from the Dixie Fire and other fires in west coast states caused the PM2.5 level to spike to over 100 mg m−3, more than 3 times the federal standard. The area temporarily had the worst air quality in the world.[37][38]

The Great Salt Lake[edit]

The Great Salt Lake has been shrinking, exposing more dried lake bed.[39][40] Researchers are concerned about particulates and arsenic blowing off the lake into urban areas.

Research[edit]

SLC historical AQI
Utah county historical AQI
Days in various AQI categories for SLC and Utah county. Approximately half of the days are not in the "Good" category (not shown).

Air quality monitoring[edit]

Various organizations monitor the air quality in Utah. The Utah Division of Air Quality has been monitoring air quality indicators since 1999 with the Utah Air Monitoring Network.[41] University of Utah scientists have installed monitors on Trax cars on the Red and Green lines in 2015.[42][43] Though not unique to Utah, Purple Air monitoring network provides particulate levels in real time.[44] Unlike other networks, Purple Air sensors can be purchased and installed by anyone.

Measurement campaigns focused on Utah air quality have brought in international researchers. In 2017 the Utah Winter Fine Particulate Study (UWFPS) involved intensive studies from the air and ground of particulates and their formation in northern Utah basins in winter.[45] Researchers were from NOAA ESRL, the Utah Division of Air Quality, the University of Utah, University of Toronto, University of Washington, and USDA.

Epidemiology[edit]

Some of the most recognized globally recognized epidemiological studies of air quality on human health have been performed in Utah. BYU professor Arden Pope has been researching health and air quality for over 30 years.[46] Pope's research began by using changes in emissions from the Geneva Steel plant in Utah Valley in a natural experiment. Pope noted an "astonishing" difference in admissions for pediatric respiratory hospital admissions when the plant was not operating. A 2016 study linked poor air quality with blood vessel damage in BYU students.[47] An analysis by the Salt Lake Tribune noted increased school absences along the Wasatch Front during air pollution episodes in Utah, though additional research is needed to determine whether or not absences were due to other coinciding incidents.[48] Life expectancy increased by about 3 years from 1980 to 2000 and 5 months of that were attributed to better air quality by Pope.[49]

Legislation[edit]

Legislation in Utah in response to poor air quality has been mixed, with some laws and ordinances expected to help, and others expected to worsen air quality. The Governor's FY 2020 budget by Gary Herbert recommended $100 million for air quality improvements.[50] Only $29 million was spent on air quality initiatives, but it was more than the typical $2 million.[23][51]

Previously a credit up to $1500 was offered for purchasing clean air vehicles.[9] However, in 2018 SB136[52] was controversially signed into law by Gary Herbert. The law, which was sponsored by Wayne Harper and Mike Schultz, implements an additional annual registration fee of up to $120 on clean air vehicles by the year 2020.[10] The additional fees were opposed by air quality advocates such as the nonprofits Breathe Utah, and Utah Clean Energy which has stated the fees are misguided.[53][54][55] Clean air advocates have voiced concerns that the additional fees will slow electric vehicle adoption in Utah and promote poorer air quality. Gasoline vehicles are the main source of pollution in Utah.[11][56] In 2022 HB 186 sponsored by Harper and Raymond Ward was signed into law by Spencer Cox which will further increase electric vehicle fees to $240 by 2032.[57]

On January 1, 2017 most oil refineries in the U.S. were required to start meeting Environmental Protection Agency rules for Tier 3 fuels which would reduce NOX, VOC, and sulfur emissions.[58] Due to their smaller size, the five refineries in Utah were exempt from the EPA requirement, and the state of Utah allowed the exemption. The Silver Eagle refinery voluntarily met the requirement in 2018, and Andeavor and Chevron voluntarily committed to meet the standard by January 1, 2020.[23][58] Holly and Big West (a subsidiary of FJ Management) have not made commitments to meet the standard early. Utah lawmakers passed tax breaks of $2M per year for the refineries to meet the requirements early.[59]

Utah has been opposed to allowing California to set higher standards for fuel efficiency and for reduced emissions for higher standards of air quality than the federal government.[60] Utah legislators Stephen Handy and Suzanne Harrison have spoken out against the rollback of fuel standards by the Trump administration, citing negative effects of air pollution in Utah on health. Utah senator Mitt Romney has voiced support for greater efficiency standards without supporting the higher standards set by California. In 2019 he voiced support for continued use of all energy sources including higher polluting sources such as burning coal.[61]

Anti-idling ordinances were passed in Salt Lake City in 2011 with fines of up to $210 for idling for more than 2 minutes.[62] As of 2018, seventy-one cities encouraged idle-free behavior.[63] The laws have led to few citations, but supporters celebrate them for making idling gasoline and diesel vehicles socially unacceptable.[64]

The Utah Indoor Clean Air Act is a statewide smoking ban, that prohibits smoking in many public places.[65]

EV Legislation[edit]

  • SB136 2018[52] (passed) In addition to regular registration fees added EV fees of $60 in 2019, $90 in 2020, and $120 in 2021. This also directed the start of a Road Usage Charge (RUC) program where additional fees can be paid at a certain rate in cents per mile. In 2020, the RUC rate was 1.5 billed monthly. To enroll in the program participants need to install an OBD device to allow a third-party to track them.[66]
  • HB209 2021[67] (failed) Would have increased additional EV fees to $240 annually in 2024.
  • HB186 2022[68] (passed) Increases additional annual EV fee from $120 to $130.25 in 2023, or a RUC of 1.0. Increases fee to $180 in 2026 or a RUC of 1.25. Increases fee to $240 in 2032 or a RUC of 1.5.
  • HB301 2023[69] (passed) This adds a third tax at EV charging stations in Utah on top of existing sales and franchise taxes. This new tax is 12.5% and some analyses estimate some EV owners will pay twice as much tax as gasoline fueled vehicle drivers.[70]

See also[edit]

External links[edit]

References[edit]

  1. ^ Neugebauer, Cimaron (Jan 31, 2017). "Salt Lake City has the worst air quality in the nation". kutv.com. KUTV. Retrieved Nov 24, 2019.
  2. ^ a b Park, McKenna (Feb 28, 2017). "Utah cities top charts for worst air quality". The Universe (student newspaper). Retrieved Nov 24, 2019.
  3. ^ "Utah Issues - The Air We Breathe". pbs.org. PBS. Feb 5, 2014. Retrieved Nov 17, 2022.
  4. ^ a b "Pollution Sources". kued.org. KUED. Archived from the original on 2020-11-12. Retrieved Nov 17, 2022.
  5. ^ "Air Quality – Sustainability". slco.org. Salt Lake County. Retrieved Dec 13, 2019.
  6. ^ "Most Polluted Cities". www.lung.org. American Lung Association. Retrieved Nov 11, 2019.
  7. ^ "Report Card: Utah". www.lung.org. American Lung Association. Retrieved Nov 11, 2019.
  8. ^ a b c Caiazzo, Fabio; Ashok, Akshay; Waitz, Ian A.; Yim, Steve H.L.; Barrett, Steven R.H. (2013). "Air pollution and early deaths in the United States. Part I: Quantifying the impact of major sectors in 2005". Atmospheric Environment. 79: 198–208. doi:10.1016/j.atmosenv.2013.05.081. ISSN 1352-2310.
  9. ^ a b "Jan. 1 2015 – Dec. 31 2016 Clean Fuel Vehicle Tax Credit Rules". deq.utah.gov. Utah DEQ. Jul 3, 2019. Retrieved Nov 24, 2019.
  10. ^ a b Raymond, Art (Dec 16, 2018). "Advocates fume as new fee on clean fuel vehicles in Utah kicks in Jan. 1". Deseret News. Retrieved Nov 24, 2019.
  11. ^ a b c Larsen, Leia (Jan 24, 2015). "8 things you should know about Utah's air inversions". Standard-Examiner. Retrieved Nov 30, 2019.
  12. ^ a b "Inversions". Utah Department of Environmental Quality. Jun 13, 2019. Retrieved Nov 30, 2019.
  13. ^ a b Baasandorj, Munkhbayar; Hoch, Sebastian W.; Bares, Ryan; Lin, John C.; Brown, Steven S.; Millet, Dylan B.; Martin, Randal; Kelly, Kerry; Zarzana, Kyle J.; Whiteman, C. David; Dube, William P.; Tonnesen, Gail; Jaramillo, Isabel Cristina; Sohl, John (2017). "Coupling between Chemical and Meteorological Processes under Persistent Cold-Air Pool Conditions: Evolution of Wintertime PM2.5 Pollution Events and N2O5 Observations in Utah's Salt Lake Valley". Environmental Science & Technology. 51 (11): 5941–5950. doi:10.1021/acs.est.6b06603. ISSN 0013-936X. PMID 28468492.
  14. ^ a b Geisel, Hunter (Nov 2, 2019). "Seasonal wood-burning restrictions now in effect for Salt Lake County". KUTV. Retrieved Nov 30, 2019.
  15. ^ Anderson, Engineering (Sep 5, 2019). "What you need to know about air pollution in Utah". Retrieved Nov 30, 2019.
  16. ^ a b c d Call, Bo (Apr 29, 2019). "Understanding Utah's Air Quality". Utah DEQ. Retrieved Dec 7, 2019.
  17. ^ a b "Who Is at Risk?". ALA. Jun 21, 2018. Retrieved Dec 7, 2019.
  18. ^ Wojcik, John (Dec 6, 2019). "Poor air quality forces kids inside for school recess". KSL. Retrieved Dec 7, 2019.
  19. ^ US EPA, OAR (26 April 2016). "Health and Environmental Effects of Particulate Matter (PM)". US EPA. Retrieved 7 Dec 2019.
  20. ^ Carrington, Damian (Sep 5, 2016). "Toxic air pollution particles found in human brains". The Guardian. Retrieved Dec 7, 2019.
  21. ^ Bishop, Kelly; Ketcham, Jonathan; Kuminoff, Nicolai (Aug 2018). "Hazed and Confused: The effect of air pollution on dementia" (PDF). doi:10.3386/w24970. S2CID 169889655. {{cite journal}}: Cite journal requires |journal= (help)
  22. ^ "Frequently asked Questions about Wintertime PM2.5 Pollution in Utah's Salt Lake Valley". University of Utah Atmospheric Sciences Department. Nov 7, 2017. Retrieved Dec 7, 2019.
  23. ^ a b c Weida, Kaz (Nov 20, 2019). "The Kids Are Not Alright – Why Utah's fight for clean air matters". Salt Lake City Weekly. Retrieved Dec 7, 2019.
  24. ^ "All Criteria Air Pollution". Utah DEQ. Apr 3, 2019. Retrieved Dec 7, 2019.
  25. ^ "Air Quality Index (AQI) Basics". Air Now. Jun 18, 2019. Retrieved Dec 7, 2019.
  26. ^ "Heart and Blood Vessels". uphe.org. Utah Physicians for a Healthy Environment. Sep 7, 2019. Retrieved Dec 7, 2019.
  27. ^ Chu, Jennifer (Aug 29, 2013). "Study: Air pollution causes 200,000 early deaths each year in the U.S." Retrieved Nov 21, 2019.
  28. ^ Anderson, Jess L.; Silcox, Carrie; Medina, Juan C. (Oct 2019). "Utah Crash Facts 2017" (PDF). highwaysafety.utah.gov. Utah Department of Public Safety. Retrieved Dec 13, 2019.
  29. ^ Penrod, Emma (Jan 11, 2018). "Utah's air quality is sickening, even killing locals year-round, new research suggests". Salt Lake Tribune. Retrieved Nov 11, 2019.
  30. ^ Mccombs, Brady (Mar 12, 2016). "Study shows spike in ER visits on Utah's bad air days". Salt Lake Tribune. Retrieved Dec 7, 2019.
  31. ^ O'Donoghue, Amy Joi (21 August 2020). "It's smoky out there, thanks to the California wildfires". Deseret News. Retrieved 25 July 2021.
  32. ^ Wilkins, Terell (15 July 2020). "Heavy smoke from wildfires raises concern about air quality in southern Utah". St. George Spectrum & Daily News. Retrieved 25 July 2021.
  33. ^ Gabbert, Bill (16 June 2020). "Smoke from Arizona wildfires moves into Utah, Colorado, and New Mexico". Wildfire Today. Retrieved 25 July 2021.
  34. ^ McKane, Scott (12 July 2021). "Air quality issues remain due to nearby wildfires". KSTU. Retrieved 25 July 2021.
  35. ^ Seikaly, Simone (10 July 2021). "Smoke over Utah coming from Oregon and California". KSL. Retrieved 25 July 2021.
  36. ^ Smukler, Jillian (13 July 2021). "'Bad for everybody': Utahns asked to limit time outdoors amid poor air quality". KTVX. Retrieved 25 July 2021.
  37. ^ Maffly, Brian (August 7, 2021). "Air quality remains poor as West Coast smoke continues to linger over much of Utah". The Salt Lake Tribune. Retrieved August 8, 2021.
  38. ^ Peery, Lexi (August 6, 2021). "Utah Had The Worst Air In The World Today — Here's What You Need To Know To Be Safe". KUER-FM. Retrieved August 8, 2021.
  39. ^ Winslow, Ben (21 July 2021). "As Great Salt Lake shrinks, northern Utah's air pollution problems could worsen". KSTU. Retrieved 25 July 2021.
  40. ^ Kafanov, Lucy; Perrot, Leslie; McLaughlin, Eliott C. (17 July 2021). "Great Salt Lake is shrinking fast. Scientists demand action before it becomes a toxic dustbin". CNN. Retrieved 25 July 2021.
  41. ^ "Utah Air Monitoring Program – Utah Air Monitoring Network". Utah DEQ. Jun 28, 2017. Retrieved Dec 28, 2019.
  42. ^ "Light rail-based air quality monitoring study launched in Salt Lake City". Environmental News Network. Jan 31, 2015. Retrieved Dec 28, 2019.
  43. ^ "Scientists Use TRAX to Study Air Quality". UTA. Jan 6, 2017. Retrieved Dec 28, 2019.
  44. ^ "Map – Purple Air". Purple Air. Retrieved Dec 28, 2019.
  45. ^ "UWFPS 2017". ESRL. Aug 30, 2018. Retrieved Dec 28, 2019.
  46. ^ Kueser, Ciera (Nov 28, 2018). "BYU professor pioneers research on air pollution's negative health effects". The Daily Universe. Retrieved Dec 14, 2019.
  47. ^ Joi O'Donoghue, Amy (Oct 26, 2016). "BYU study links air pollution to blood vessel damage". KSL-TV. Retrieved Dec 14, 2018.
  48. ^ Stewart, Kirsten (Mar 3, 2014). "Does Utah's air pollution increase school absences?". Salt Lake Tribune. Retrieved Dec 14, 2019.
  49. ^ Lite, Jordan (Jan 21, 2009). "Clean air equals longer life, study says". Scientific American. Retrieved Dec 14, 2019.
  50. ^ "What Can $100 Million Do for Air Quality?". Governor's Office of Management & Budget. Feb 1, 2019. Retrieved Dec 7, 2019.
  51. ^ Herberts, Adam (Sep 20, 2019). "Utahns young and old march for action against climate change". FOX-13. Retrieved Dec 7, 2019.
  52. ^ a b Harper, Wayne A. "S.B. 136 Transportation Governance Amendments".
  53. ^ "SB 136 Transportation Governance Amendments". Breathe Utah. Retrieved Nov 30, 2019.
  54. ^ O'Donoghue, Amy Joi (Mar 1, 2018). "Clean energy advocates decry proposed electric, hybrid vehicle fees". KSL. Retrieved Nov 30, 2019.
  55. ^ Craft, Josh; Emerson, Kevin (Mar 17, 2018). "Commentary: The 2018 Utah legislative session brought us a win for clean energy and climate". Salt Lake Tribune. Retrieved Nov 30, 2019. When Utahns are taking personal steps to improve air quality by purchasing a clean vehicle, tacking on another fee is misguided.
  56. ^ Klopfenstein, Jacob (Dec 6, 2018). "Here's where Utah's infamous pollution comes from, and how you can help reduce pollution". KSL. Retrieved Nov 30, 2019.
  57. ^ "H.B. 186 Vehicle Registration Amendments". utah.gov. 2022. Retrieved Nov 17, 2022.
  58. ^ a b "Tier 3 Fuels 2018 State of the Environment Report (AQ)". deq.utah.gov. Utah DEQ. Jan 2, 2019. Retrieved Dec 13, 2019.
  59. ^ Davidson, Lee (Mar 9, 2019). "Utah lawmakers pass tax incentive for refineries to produce cleaner gas". Salt Lake Tribune. Retrieved Dec 13, 2019.
  60. ^ Stronberg, Joel (Nov 1, 2019). "Federal Fuel Efficiency Standards: Another Unnecessary Conflict in the Age of Trump". resilience.org. Post Carbon Institute. Retrieved Dec 13, 2019.
  61. ^ Rodgers, Bethany (Aug 28, 2019). "Utah clean air advocates say Trump's plan to weaken pollution standards is 'unthinkable'". Salt Lake Tribune. Retrieved Dec 13, 2019.
  62. ^ Page, Jared (Oct 25, 2011). "Idling longer than 2 minutes now illegal in Salt Lake City". KSL. Retrieved Nov 30, 2019.
  63. ^ Higgins, Hailey (Oct 3, 2019). "Mayors of Utah's anti-idling cities struggle with enforceability". FOX-13. Retrieved Nov 30, 2019.
  64. ^ Oliver, Mark (Nov 12, 2018). "After 6 years, only 8 people have been fined under Utah's idle-free ordinances". KSL. Retrieved Nov 30, 2019.
  65. ^ "Utah State Legislature". Le.utah.gov. Archived from the original on February 9, 2014. Retrieved December 31, 2013.
  66. ^ "Welcome to Utah's Road Usage Charge Program". Retrieved November 5, 2023.
  67. ^ "H.B. 209 Vehicle Registration Fee Revisions". utah.gov. Utah State Legislature. Retrieved November 5, 2023.
  68. ^ "H.B. 186 Vehicle Registration Amendments". utah.gov. Utah State Legislature. Retrieved November 5, 2023.
  69. ^ "H.B. 301 Transportation Tax Amendments". utah.gov. Utah State Legislature. Retrieved November 5, 2023.
  70. ^ Harden, Tracy (February 23, 2021). "Tracy Harden: Added tax on EV users won't improve Utah's air quality". The Salt Lake Tribune. Retrieved November 5, 2023.
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