Get breaking news alerts via email

Click here to manage your alerts

Utah cities atop EPA’s worst-air-quality list
Weather » Storm expected Wednesday to break up inversion.
First Published Jan 21 2013 08:47 am • Last Updated May 05 2013 11:33 pm

For the second day in a row, haze and poor visibility are expected to earn two Utah towns the dubious distinction of being first and second on the list of U.S. cities with the most unhealthy air, according to a ranking from the federal Environmental Protection Agency.

EPA forecasters predict Logan will have the nation’s worst air on Tuesday, with Provo in second. Brigham City is third on the list, with air considered unhealthy for "sensitive groups," which includes those suffering from heart and lung diseases, older adults and children, according to the EPA website, AIRnow.gov.

Join the Discussion
Post a Comment

Monday’s ranking listed Provo first and Logan second.

The weather phenomenon known as an inversion, when a warm high pressure system seals cold air and pollution into Utah’s valleys and creates a dirty haze that can settle for days, is likely to blame for the index’s high ratings.

The EPA measures five pollutants to judge air quality, including ground-level ozone, particle pollution (also known as particulate matter), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Air quality is measured on a ratings value scale index of 0 to 500. Any measurement over 151 is considered unhealthy for most people.

Monday afternoon, Provo’s air quality score was 172. Logan was a close second at 155.

The Utah Division of Air Quality continues to forecast unhealthy air into Wednesday for many areas of the state, issuing "red" air alert warnings for Box Elder, Cache, Davis, Salt Lake, Tooele, Utah and Weber counties. The air will be harmful in those areas for the very young, very old and people with respiratory illnesses. People are encouraged to cut back on driving and the division calls for no burning in those areas.

Duchesne and Uintah counties have a "yellow" air quality warning in effect for Tuesday and Wednesday.

The National Weather Service is forecasting a storm late Wednesday into Thursday that could break up the inversion.

Until then, temperatures are expected to stay about the same as they have been. Overnight lows along the Wasatch Front will reach the single-digit neighborhood, while Logan is expected to get as low as 10 below zero before Tuesday morning. During the day, the temperatures in most of northern Utah won’t break 21 degrees. Park City and Heber could reach as high as 43 and 34 degrees, respectively.

story continues below
story continues below

The National Weather Service expects daytime highs of 20 degrees in Salt Lake City, 14 in Ogden, 21 in Provo and 7 degrees in Logan.

Temperatures in the south will be a little warmer, with St. George forecast at a daytime high of 60 degrees, Kanab at 57 and Cedar City at 36. In the eastern part of the state, Manila will see a daytime high of 41, Blanding will get to 42 and Vernal will remain at a chilly 15 degree high Tuesday.

Also for Tuesday, the Utah Avalanche Center predicts the Salt Lake, Provo, Ogden and Logan mountain areas will be a low risk for dangerous snow slides; the Uintas will be at a moderate risk.


Twitter: @KimballBennion

Jennifer Dobner contributed to this report.

Copyright 2014 The Salt Lake Tribune. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Top Reader Comments Read All Comments Post a Comment
Click here to read all comments   Click here to post a comment

About Reader Comments

Reader comments on sltrib.com are the opinions of the writer, not The Salt Lake Tribune. We will delete comments containing obscenities, personal attacks and inappropriate or offensive remarks. Flagrant or repeat violators will be banned. If you see an objectionable comment, please alert us by clicking the arrow on the upper right side of the comment and selecting "Flag comment as inappropriate". If you've recently registered with Disqus or aren't seeing your comments immediately, you may need to verify your email address. To do so, visit disqus.com/account.
See more about comments here.
Staying Connected
Contests and Promotions
  • Search Obituaries
  • Place an Obituary

  • Search Cars
  • Search Homes
  • Search Jobs
  • Search Marketplace
  • Search Legal Notices

  • Other Services
  • Advertise With Us
  • Subscribe to the Newspaper
  • Access your e-Edition
  • Frequently Asked Questions
  • Contact a newsroom staff member
  • Access the Trib Archives
  • Privacy Policy
  • Missing your paper? Need to place your paper on vacation hold? For this and any other subscription related needs, click here or call 801.204.6100.