EnviroNearby

Daggett County, Utah air quality history

Daily Air Quality Index summaries from EPA monitors in Daggett, Utah, 2010–2014.

82%
Good days in 2014
44
Median daily AQI, 2014
0
Days above 100 in 2014
147
Days with an AQI in 2014 (of 365)

In 2014, EPA reported a daily Air Quality Index (AQI) for Daggett, Utah on 147 days. 120 of those days (82%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Utah (median 44.5 across 14 counties), and about the same as the typical monitored U.S. county (42). The main pollutant was ozone on 147 days.

EPA did not report an AQI for every day of 2014 here (147 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 2014; EPA's files for 2015–2025 contain no row for it, which usually means its monitors stopped reporting.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%2010: Good 100 of 132 days2010: Moderate 32 of 132 days20102011: Good 108 of 130 days2011: Moderate 22 of 130 days20112012: Good 82 of 189 days2012: Moderate 107 of 189 days20122013: Good 112 of 172 days2013: Moderate 60 of 172 days20132014: Good 120 of 147 days2014: Moderate 27 of 147 days2014
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501002010: 90th percentile AQI 672011: 90th percentile AQI 542012: 90th percentile AQI 742013: 90th percentile AQI 712014: 90th percentile AQI 582010: Median AQI 472011: Median AQI 442012: Median AQI 512013: Median AQI 482014: Median AQI 4420102011201220132014
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2014

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone147100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2014147120270000445877Ozone
2013172112600000487190Ozone
2012189821070000517493Ozone
2011130108220000445490Ozone
2010132100320000476790Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

All monitored counties in Utah

Source: U.S. EPA AirData, “Annual AQI by County” files for 2010–2014 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem