EnviroNearby

Atascosa County, Texas air quality history

Daily Air Quality Index summaries from EPA monitors in Atascosa, Texas, 2020–2025.

76%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
341
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Atascosa, Texas on 341 days. 259 of those days (76%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Texas (median 43.5 across 44 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 341 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 64% in 2020–2022 versus 66% 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%2020: Good 149 of 214 days2020: Moderate 64 of 214 days2020: Unhealthy 1 of 214 days20202021: Good 213 of 356 days2021: Moderate 143 of 356 days20212022: Good 218 of 356 days2022: Moderate 136 of 356 days2022: Unhealthy for Sensitive Groups 2 of 356 days20222023: Good 210 of 330 days2023: Moderate 120 of 330 days20232024: Good 198 of 347 days2024: Moderate 141 of 347 days2024: Unhealthy for Sensitive Groups 8 of 347 days20242025: Good 259 of 341 days2025: Moderate 82 of 341 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 year0501002020: 90th percentile AQI 652021: 90th percentile AQI 632022: 90th percentile AQI 622023: 90th percentile AQI 642024: 90th percentile AQI 722025: 90th percentile AQI 612020: Median AQI 382021: Median AQI 432022: Median AQI 442023: Median AQI 422024: Median AQI 442025: Median AQI 35202020212022202320242025
  • 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
Fine particles (PM2.5)341100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025341259820000356192PM2.5
202434719814180004472116PM2.5
20233302101200000426486PM2.5
202235621813620004462115PM2.5
20213562131430000436387PM2.5
20202141496401003865158PM2.5

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 2020–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem