EnviroNearby

Navarro County, Texas air quality history

Daily Air Quality Index summaries from EPA monitors in Navarro, Texas, 2009–2025.

59%
Good days in 2025
47
Median daily AQI, 2025
1
Days above 100 in 2025
363
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Navarro, Texas on 363 days. 215 of those days (59%) were in the Good range, and the median daily AQI was 47. That median is higher than the typical monitored county in Texas (median 43.5 across 44 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 205 days. Across the years with fuller monitoring, the share of Good days rose: an average of 49% in 2009–2011 versus 58% in 2023–2025.

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%2009: Good 98 of 197 days2009: Moderate 99 of 197 days20092010: Good 196 of 364 days2010: Moderate 167 of 364 days2010: Unhealthy for Sensitive Groups 1 of 364 days2011: Good 162 of 365 days2011: Moderate 190 of 365 days2011: Unhealthy for Sensitive Groups 13 of 365 days20112012: Good 206 of 366 days2012: Moderate 158 of 366 days2012: Unhealthy for Sensitive Groups 1 of 366 days2012: Unhealthy 1 of 366 days2013: Good 207 of 365 days2013: Moderate 153 of 365 days2013: Unhealthy for Sensitive Groups 5 of 365 days20132014: Good 215 of 364 days2014: Moderate 149 of 364 days2015: Good 234 of 364 days2015: Moderate 129 of 364 days2015: Unhealthy for Sensitive Groups 1 of 364 days20152016: Good 260 of 366 days2016: Moderate 106 of 366 days2017: Good 233 of 365 days2017: Moderate 131 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days20172018: Good 266 of 364 days2018: Moderate 94 of 364 days2018: Unhealthy for Sensitive Groups 4 of 364 days2019: Good 275 of 362 days2019: Moderate 87 of 362 days20192020: Good 257 of 366 days2020: Moderate 107 of 366 days2020: Unhealthy for Sensitive Groups 2 of 366 days2021: Good 266 of 365 days2021: Moderate 99 of 365 days20212022: Good 242 of 364 days2022: Moderate 121 of 364 days2022: Unhealthy for Sensitive Groups 1 of 364 days2023: Good 217 of 364 days2023: Moderate 147 of 364 days20232024: Good 205 of 366 days2024: Moderate 153 of 366 days2024: Unhealthy for Sensitive Groups 8 of 366 days2025: Good 215 of 363 days2025: Moderate 147 of 363 days2025: Unhealthy for Sensitive Groups 1 of 363 days2025
  • 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 year0501002009: 90th percentile AQI 712010: 90th percentile AQI 672011: 90th percentile AQI 802012: 90th percentile AQI 712013: 90th percentile AQI 712014: 90th percentile AQI 622015: 90th percentile AQI 652016: 90th percentile AQI 582017: 90th percentile AQI 622018: 90th percentile AQI 682019: 90th percentile AQI 572020: 90th percentile AQI 582021: 90th percentile AQI 612022: 90th percentile AQI 642023: 90th percentile AQI 692024: 90th percentile AQI 772025: 90th percentile AQI 652009: Median AQI 512010: Median AQI 492011: Median AQI 522012: Median AQI 482013: Median AQI 472014: Median AQI 472015: Median AQI 432016: Median AQI 432017: Median AQI 462018: Median AQI 412019: Median AQI 422020: Median AQI 422021: Median AQI 412022: Median AQI 442023: Median AQI 462024: Median AQI 482025: Median AQI 47200920112013201520172019202120232025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

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
Ozone20556%
Fine particles (PM2.5)15844%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536321514710004765107Ozone
202436620515380004877129Ozone
202336421714700004669100Ozone
202236424212110004464101Ozone
20213652669900004161100Ozone
202036625710720004258113PM2.5
20193622758700004257100Ozone
20183642669440004168117Ozone
201736523313110004662108PM2.5
20163662601060000435885PM2.5
201536423412910004365105PM2.5
20143642151490000476293PM2.5
201336520715350004771126PM2.5
201236620615811004871159PM2.5
2011365162190130005280147PM2.5
201036419616710004967105PM2.5
200919798990000517197PM2.5

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.

Counties in Texas with a similar median AQI in 2025

All monitored counties in Texas

Source: U.S. EPA AirData, “Annual AQI by County” files for 2009–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem