EnviroNearby

Hardin County, Texas air quality history

Daily Air Quality Index summaries from EPA monitors in Hardin, Texas, 1989–1993.

81%
Good days in 1993
36
Median daily AQI, 1993
17
Days above 100 in 1993
310
Days with an AQI in 1993 (of 365)

In 1993, EPA reported a daily Air Quality Index (AQI) for Hardin, Texas on 310 days. 251 of those days (81%) were in the Good range, and the median daily AQI was 36. That median is about the same as the typical monitored county in Texas (median 36 across 19 counties), and about the same as the typical monitored U.S. county (38). The main pollutant was ozone on 310 days.

The most recent year with data for this county is 1993; EPA's files for 1994–2025 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%1989: Good 287 of 339 days1989: Moderate 40 of 339 days1989: Unhealthy for Sensitive Groups 7 of 339 days1989: Unhealthy 5 of 339 days19891990: Good 226 of 274 days1990: Moderate 35 of 274 days1990: Unhealthy for Sensitive Groups 13 of 274 days19901991: Good 263 of 316 days1991: Moderate 43 of 316 days1991: Unhealthy for Sensitive Groups 8 of 316 days1991: Unhealthy 2 of 316 days19911992: Good 214 of 258 days1992: Moderate 32 of 258 days1992: Unhealthy for Sensitive Groups 11 of 258 days1992: Unhealthy 1 of 258 days19921993: Good 251 of 310 days1993: Moderate 42 of 310 days1993: Unhealthy for Sensitive Groups 13 of 310 days1993: Unhealthy 4 of 310 days1993
  • 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 year0501001989: 90th percentile AQI 671990: 90th percentile AQI 771991: 90th percentile AQI 711992: 90th percentile AQI 741993: 90th percentile AQI 771989: Median AQI 331990: Median AQI 331991: Median AQI 341992: Median AQI 361993: Median AQI 3619891990199119921993
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1993

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
Ozone310100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
199331025142134003677185Ozone
199225821432111003674161Ozone
19913162634382003471161Ozone
199027422635130003377150Ozone
19893392874075003367179Ozone

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 Texas

Source: U.S. EPA AirData, “Annual AQI by County” files for 1989–1993 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem