EnviroNearby

Gregg County, Texas air quality history

Daily Air Quality Index summaries from EPA monitors in Gregg, Texas, 1980–2025.

87%
Good days in 2025
36
Median daily AQI, 2025
1
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Gregg, Texas on 365 days. 316 of those days (87%) were in the Good range, and the median daily AQI was 36. 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 ozone on 364 days. Across the years with fuller monitoring, the share of Good days rose: an average of 75% in 1980–1982 versus 86% 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%1980: Good 233 of 321 days1980: Moderate 51 of 321 days1980: Unhealthy for Sensitive Groups 23 of 321 days1980: Unhealthy 14 of 321 days19801981: Good 244 of 306 days1981: Moderate 36 of 306 days1981: Unhealthy for Sensitive Groups 18 of 306 days1981: Unhealthy 8 of 306 days1982: Good 234 of 328 days1982: Moderate 63 of 328 days1982: Unhealthy for Sensitive Groups 24 of 328 days1982: Unhealthy 6 of 328 days1982: Very Unhealthy 1 of 328 days1983: Good 223 of 332 days1983: Moderate 61 of 332 days1983: Unhealthy for Sensitive Groups 38 of 332 days1983: Unhealthy 8 of 332 days1983: Very Unhealthy 2 of 332 days1984: Good 232 of 333 days1984: Moderate 79 of 333 days1984: Unhealthy for Sensitive Groups 19 of 333 days1984: Unhealthy 3 of 333 days1985: Good 251 of 335 days1985: Moderate 57 of 335 days1985: Unhealthy for Sensitive Groups 23 of 335 days1985: Unhealthy 4 of 335 days19851987: Good 164 of 212 days1987: Moderate 36 of 212 days1987: Unhealthy for Sensitive Groups 8 of 212 days1987: Unhealthy 4 of 212 days1988: Good 235 of 340 days1988: Moderate 76 of 340 days1988: Unhealthy for Sensitive Groups 23 of 340 days1988: Unhealthy 6 of 340 days1989: Good 263 of 343 days1989: Moderate 67 of 343 days1989: Unhealthy for Sensitive Groups 9 of 343 days1989: Unhealthy 4 of 343 days1990: Good 218 of 306 days1990: Moderate 60 of 306 days1990: Unhealthy for Sensitive Groups 21 of 306 days1990: Unhealthy 7 of 306 days1991: Good 184 of 254 days1991: Moderate 52 of 254 days1991: Unhealthy for Sensitive Groups 15 of 254 days1991: Unhealthy 3 of 254 days19911992: Good 211 of 292 days1992: Moderate 70 of 292 days1992: Unhealthy for Sensitive Groups 9 of 292 days1992: Unhealthy 2 of 292 days1993: Good 233 of 267 days1993: Moderate 25 of 267 days1993: Unhealthy for Sensitive Groups 5 of 267 days1993: Unhealthy 3 of 267 days1993: Very Unhealthy 1 of 267 days1994: Good 248 of 335 days1994: Moderate 70 of 335 days1994: Unhealthy for Sensitive Groups 15 of 335 days1994: Unhealthy 2 of 335 days1995: Good 202 of 344 days1995: Moderate 74 of 344 days1995: Unhealthy for Sensitive Groups 42 of 344 days1995: Unhealthy 24 of 344 days1995: Very Unhealthy 2 of 344 days1996: Good 250 of 328 days1996: Moderate 61 of 328 days1996: Unhealthy for Sensitive Groups 15 of 328 days1996: Unhealthy 2 of 328 days19961997: Good 236 of 344 days1997: Moderate 76 of 344 days1997: Unhealthy for Sensitive Groups 25 of 344 days1997: Unhealthy 7 of 344 days1998: Good 218 of 362 days1998: Moderate 81 of 362 days1998: Unhealthy for Sensitive Groups 48 of 362 days1998: Unhealthy 12 of 362 days1998: Very Unhealthy 3 of 362 days1999: Good 217 of 352 days1999: Moderate 75 of 352 days1999: Unhealthy for Sensitive Groups 42 of 352 days1999: Unhealthy 15 of 352 days1999: Very Unhealthy 3 of 352 days2000: Good 201 of 361 days2000: Moderate 117 of 361 days2000: Unhealthy for Sensitive Groups 29 of 361 days2000: Unhealthy 14 of 361 days2001: Good 224 of 365 days2001: Moderate 113 of 365 days2001: Unhealthy for Sensitive Groups 27 of 365 days2001: Unhealthy 1 of 365 days20012002: Good 233 of 365 days2002: Moderate 103 of 365 days2002: Unhealthy for Sensitive Groups 27 of 365 days2002: Unhealthy 2 of 365 days2003: Good 216 of 365 days2003: Moderate 133 of 365 days2003: Unhealthy for Sensitive Groups 14 of 365 days2003: Unhealthy 2 of 365 days2004: Good 248 of 365 days2004: Moderate 101 of 365 days2004: Unhealthy for Sensitive Groups 14 of 365 days2004: Unhealthy 2 of 365 days2005: Good 231 of 364 days2005: Moderate 101 of 364 days2005: Unhealthy for Sensitive Groups 28 of 364 days2005: Unhealthy 4 of 364 days2006: Good 277 of 360 days2006: Moderate 56 of 360 days2006: Unhealthy for Sensitive Groups 24 of 360 days2006: Unhealthy 3 of 360 days20062007: Good 301 of 365 days2007: Moderate 55 of 365 days2007: Unhealthy for Sensitive Groups 7 of 365 days2007: Unhealthy 2 of 365 days2008: Good 313 of 364 days2008: Moderate 46 of 364 days2008: Unhealthy for Sensitive Groups 5 of 364 days2009: Good 312 of 365 days2009: Moderate 47 of 365 days2009: Unhealthy for Sensitive Groups 6 of 365 days2010: Good 294 of 364 days2010: Moderate 60 of 364 days2010: Unhealthy for Sensitive Groups 10 of 364 days2011: Good 254 of 346 days2011: Moderate 69 of 346 days2011: Unhealthy for Sensitive Groups 21 of 346 days2011: Unhealthy 2 of 346 days20112012: Good 296 of 363 days2012: Moderate 62 of 363 days2012: Unhealthy for Sensitive Groups 5 of 363 days2013: Good 310 of 364 days2013: Moderate 50 of 364 days2013: Unhealthy for Sensitive Groups 4 of 364 days2014: Good 341 of 365 days2014: Moderate 22 of 365 days2014: Unhealthy for Sensitive Groups 2 of 365 days2015: Good 324 of 365 days2015: Moderate 39 of 365 days2015: Unhealthy for Sensitive Groups 2 of 365 days2016: Good 336 of 366 days2016: Moderate 30 of 366 days20162017: Good 339 of 364 days2017: Moderate 25 of 364 days2018: Good 329 of 364 days2018: Moderate 35 of 364 days2019: Good 328 of 362 days2019: Moderate 33 of 362 days2019: Unhealthy for Sensitive Groups 1 of 362 days2020: Good 357 of 363 days2020: Moderate 6 of 363 days2021: Good 336 of 365 days2021: Moderate 29 of 365 days20212022: Good 329 of 365 days2022: Moderate 35 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 304 of 365 days2023: Moderate 59 of 365 days2023: Unhealthy for Sensitive Groups 1 of 365 days2023: Unhealthy 1 of 365 days2024: Good 322 of 360 days2024: Moderate 36 of 360 days2024: Unhealthy for Sensitive Groups 2 of 360 days2025: Good 316 of 365 days2025: Moderate 48 of 365 days2025: Unhealthy for Sensitive Groups 1 of 365 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 year0501001501980: 90th percentile AQI 1011981: 90th percentile AQI 871982: 90th percentile AQI 1001983: 90th percentile AQI 1191984: 90th percentile AQI 901985: 90th percentile AQI 871987: 90th percentile AQI 841988: 90th percentile AQI 1001989: 90th percentile AQI 771990: 90th percentile AQI 1001991: 90th percentile AQI 901992: 90th percentile AQI 901993: 90th percentile AQI 641994: 90th percentile AQI 841995: 90th percentile AQI 1331996: 90th percentile AQI 771997: 90th percentile AQI 1001998: 90th percentile AQI 1221999: 90th percentile AQI 1262000: 90th percentile AQI 1082001: 90th percentile AQI 932002: 90th percentile AQI 842003: 90th percentile AQI 872004: 90th percentile AQI 772005: 90th percentile AQI 1002006: 90th percentile AQI 902007: 90th percentile AQI 712008: 90th percentile AQI 582009: 90th percentile AQI 612010: 90th percentile AQI 712011: 90th percentile AQI 902012: 90th percentile AQI 672013: 90th percentile AQI 542014: 90th percentile AQI 492015: 90th percentile AQI 512016: 90th percentile AQI 492017: 90th percentile AQI 482018: 90th percentile AQI 502019: 90th percentile AQI 502020: 90th percentile AQI 442021: 90th percentile AQI 482022: 90th percentile AQI 502023: 90th percentile AQI 672024: 90th percentile AQI 512025: 90th percentile AQI 541980: Median AQI 391981: Median AQI 341982: Median AQI 381983: Median AQI 421984: Median AQI 401985: Median AQI 391987: Median AQI 331988: Median AQI 421989: Median AQI 371990: Median AQI 401991: Median AQI 391992: Median AQI 421993: Median AQI 341994: Median AQI 381995: Median AQI 451996: Median AQI 391997: Median AQI 401998: Median AQI 461999: Median AQI 442000: Median AQI 472001: Median AQI 442002: Median AQI 432003: Median AQI 452004: Median AQI 422005: Median AQI 432006: Median AQI 372007: Median AQI 342008: Median AQI 342009: Median AQI 362010: Median AQI 372011: Median AQI 392012: Median AQI 362013: Median AQI 352014: Median AQI 332015: Median AQI 332016: Median AQI 362017: Median AQI 352018: Median AQI 322019: Median AQI 352020: Median AQI 312021: Median AQI 332022: Median AQI 352023: Median AQI 352024: Median AQI 372025: Median AQI 361980198519911996200120062011201620212025
  • 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
Ozone364100%
Nitrogen dioxide (NO₂)1<1%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253653164810003654115Ozone
20243603223620003751129Ozone
20233653045911003567151Ozone
20223653293510003550143Ozone
2021365336290000334893Ozone
202036335760000314474Ozone
20193623283310003550112Ozone
2018364329350000325097Ozone
2017364339250000354877Ozone
20163663363000003649100Ozone
20153653243920003351143Ozone
20143653412220003349115Ozone
20133643105040003554129Ozone
20123632966250003667143Ozone
201134625469212003990159Ozone
201036429460100003771133Ozone
20093653124760003661126Ozone
20083643134650003458140Ozone
20073653015572003471164Ozone
200636027756243003790161Ozone
20053642311012840043100172Ozone
2004365248101142004277197Ozone
2003365216133142004587154Ozone
2002365233103272004384164Ozone
2001365224113271004493174Ozone
200036120111729140047108195Ozone
19993522177542153044126209Ozone
19983622188148123046122209Ozone
1997344236762570040100195Ozone
199632825061152003977156Ozone
19953442027442242045133205Ozone
199433524870152003884156Ozone
19932672332553103464207Ozone
19922922117092004290166Ozone
199125418452153003990169Ozone
1990306218602170040100177Ozone
19893432636794003777156Ozone
1988340235762360042100182Ozone
19872121643684003384187Ozone
198533525157234003987187Ozone
198433323279193004090200Ozone
1983332223613882042119221Ozone
1982328234632461038100203Ozone
198130624436188003487190Ozone
19803212335123140039101195Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem