EnviroNearby

Denton County, Texas air quality history

Daily Air Quality Index summaries from EPA monitors in Denton, Texas, 1981–2025.

58%
Good days in 2025
47
Median daily AQI, 2025
19
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 Denton, Texas on 365 days. 211 of those days (58%) 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 234 days. Across the years with fuller monitoring, the share of Good days fell: an average of 68% in 1981–1983 versus 57% 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%1981: Good 212 of 317 days1981: Moderate 61 of 317 days1981: Unhealthy for Sensitive Groups 24 of 317 days1981: Unhealthy 19 of 317 days1981: Very Unhealthy 1 of 317 days19811982: Good 242 of 312 days1982: Moderate 46 of 312 days1982: Unhealthy for Sensitive Groups 17 of 312 days1982: Unhealthy 6 of 312 days1982: Very Unhealthy 1 of 312 days1983: Good 207 of 347 days1983: Moderate 64 of 347 days1983: Unhealthy for Sensitive Groups 33 of 347 days1983: Unhealthy 32 of 347 days1983: Very Unhealthy 11 of 347 days1984: Good 232 of 356 days1984: Moderate 52 of 356 days1984: Unhealthy for Sensitive Groups 44 of 356 days1984: Unhealthy 20 of 356 days1984: Very Unhealthy 8 of 356 days1985: Good 205 of 330 days1985: Moderate 58 of 330 days1985: Unhealthy for Sensitive Groups 25 of 330 days1985: Unhealthy 27 of 330 days1985: Very Unhealthy 15 of 330 days1986: Good 215 of 324 days1986: Moderate 68 of 324 days1986: Unhealthy for Sensitive Groups 25 of 324 days1986: Unhealthy 15 of 324 days1986: Very Unhealthy 1 of 324 days19861987: Good 215 of 345 days1987: Moderate 77 of 345 days1987: Unhealthy for Sensitive Groups 34 of 345 days1987: Unhealthy 16 of 345 days1987: Very Unhealthy 3 of 345 days1988: Good 174 of 329 days1988: Moderate 81 of 329 days1988: Unhealthy for Sensitive Groups 48 of 329 days1988: Unhealthy 26 of 329 days1989: Good 216 of 344 days1989: Moderate 76 of 344 days1989: Unhealthy for Sensitive Groups 37 of 344 days1989: Unhealthy 13 of 344 days1989: Very Unhealthy 2 of 344 days1990: Good 256 of 348 days1990: Moderate 53 of 348 days1990: Unhealthy for Sensitive Groups 28 of 348 days1990: Unhealthy 8 of 348 days1990: Very Unhealthy 3 of 348 days1991: Good 334 of 336 days1991: Moderate 2 of 336 days19911992: Good 268 of 361 days1992: Moderate 59 of 361 days1992: Unhealthy for Sensitive Groups 21 of 361 days1992: Unhealthy 11 of 361 days1992: Very Unhealthy 2 of 361 days1993: Good 272 of 353 days1993: Moderate 42 of 353 days1993: Unhealthy for Sensitive Groups 25 of 353 days1993: Unhealthy 12 of 353 days1993: Very Unhealthy 2 of 353 days1994: Good 227 of 360 days1994: Moderate 75 of 360 days1994: Unhealthy for Sensitive Groups 34 of 360 days1994: Unhealthy 23 of 360 days1994: Very Unhealthy 1 of 360 days1995: Good 224 of 364 days1995: Moderate 72 of 364 days1995: Unhealthy for Sensitive Groups 30 of 364 days1995: Unhealthy 29 of 364 days1995: Very Unhealthy 9 of 364 days1996: Good 239 of 366 days1996: Moderate 78 of 366 days1996: Unhealthy for Sensitive Groups 32 of 366 days1996: Unhealthy 16 of 366 days1996: Very Unhealthy 1 of 366 days19961997: Good 247 of 364 days1997: Moderate 62 of 364 days1997: Unhealthy for Sensitive Groups 36 of 364 days1997: Unhealthy 15 of 364 days1997: Very Unhealthy 4 of 364 days1998: Good 211 of 355 days1998: Moderate 76 of 355 days1998: Unhealthy for Sensitive Groups 45 of 355 days1998: Unhealthy 21 of 355 days1998: Very Unhealthy 2 of 355 days1999: Good 231 of 365 days1999: Moderate 75 of 365 days1999: Unhealthy for Sensitive Groups 35 of 365 days1999: Unhealthy 19 of 365 days1999: Very Unhealthy 5 of 365 days2000: Good 276 of 363 days2000: Moderate 43 of 363 days2000: Unhealthy for Sensitive Groups 30 of 363 days2000: Unhealthy 12 of 363 days2000: Very Unhealthy 2 of 363 days2001: Good 259 of 358 days2001: Moderate 54 of 358 days2001: Unhealthy for Sensitive Groups 32 of 358 days2001: Unhealthy 12 of 358 days2001: Very Unhealthy 1 of 358 days20012002: Good 273 of 355 days2002: Moderate 36 of 355 days2002: Unhealthy for Sensitive Groups 34 of 355 days2002: Unhealthy 9 of 355 days2002: Very Unhealthy 3 of 355 days2003: Good 259 of 365 days2003: Moderate 71 of 365 days2003: Unhealthy for Sensitive Groups 26 of 365 days2003: Unhealthy 9 of 365 days2004: Good 284 of 362 days2004: Moderate 45 of 362 days2004: Unhealthy for Sensitive Groups 23 of 362 days2004: Unhealthy 10 of 362 days2005: Good 152 of 364 days2005: Moderate 158 of 364 days2005: Unhealthy for Sensitive Groups 41 of 364 days2005: Unhealthy 12 of 364 days2005: Very Unhealthy 1 of 364 days2006: Good 168 of 365 days2006: Moderate 150 of 365 days2006: Unhealthy for Sensitive Groups 28 of 365 days2006: Unhealthy 18 of 365 days2006: Very Unhealthy 1 of 365 days20062007: Good 181 of 365 days2007: Moderate 160 of 365 days2007: Unhealthy for Sensitive Groups 19 of 365 days2007: Unhealthy 4 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 182 of 366 days2008: Moderate 165 of 366 days2008: Unhealthy for Sensitive Groups 16 of 366 days2008: Unhealthy 3 of 366 days2009: Good 176 of 365 days2009: Moderate 160 of 365 days2009: Unhealthy for Sensitive Groups 26 of 365 days2009: Unhealthy 3 of 365 days2010: Good 187 of 365 days2010: Moderate 166 of 365 days2010: Unhealthy for Sensitive Groups 12 of 365 days2011: Good 176 of 365 days2011: Moderate 142 of 365 days2011: Unhealthy for Sensitive Groups 33 of 365 days2011: Unhealthy 14 of 365 days20112012: Good 181 of 366 days2012: Moderate 153 of 366 days2012: Unhealthy for Sensitive Groups 29 of 366 days2012: Unhealthy 3 of 366 days2013: Good 194 of 365 days2013: Moderate 139 of 365 days2013: Unhealthy for Sensitive Groups 30 of 365 days2013: Unhealthy 2 of 365 days2014: Good 198 of 365 days2014: Moderate 154 of 365 days2014: Unhealthy for Sensitive Groups 12 of 365 days2014: Unhealthy 1 of 365 days2015: Good 212 of 365 days2015: Moderate 132 of 365 days2015: Unhealthy for Sensitive Groups 17 of 365 days2015: Unhealthy 4 of 365 days2016: Good 248 of 366 days2016: Moderate 107 of 366 days2016: Unhealthy for Sensitive Groups 11 of 366 days20162017: Good 238 of 365 days2017: Moderate 118 of 365 days2017: Unhealthy for Sensitive Groups 9 of 365 days2018: Good 254 of 365 days2018: Moderate 97 of 365 days2018: Unhealthy for Sensitive Groups 13 of 365 days2018: Unhealthy 1 of 365 days2019: Good 239 of 365 days2019: Moderate 114 of 365 days2019: Unhealthy for Sensitive Groups 12 of 365 days2020: Good 245 of 366 days2020: Moderate 113 of 366 days2020: Unhealthy for Sensitive Groups 8 of 366 days2021: Good 222 of 365 days2021: Moderate 122 of 365 days2021: Unhealthy for Sensitive Groups 18 of 365 days2021: Unhealthy 3 of 365 days20212022: Good 209 of 365 days2022: Moderate 136 of 365 days2022: Unhealthy for Sensitive Groups 19 of 365 days2022: Unhealthy 1 of 365 days2023: Good 200 of 365 days2023: Moderate 133 of 365 days2023: Unhealthy for Sensitive Groups 27 of 365 days2023: Unhealthy 5 of 365 days2024: Good 210 of 366 days2024: Moderate 128 of 366 days2024: Unhealthy for Sensitive Groups 25 of 366 days2024: Unhealthy 3 of 366 days2025: Good 211 of 365 days2025: Moderate 135 of 365 days2025: Unhealthy for Sensitive Groups 17 of 365 days2025: Unhealthy 2 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 year0501001502001981: 90th percentile AQI 1191982: 90th percentile AQI 871983: 90th percentile AQI 1561984: 90th percentile AQI 1431985: 90th percentile AQI 1611986: 90th percentile AQI 1151987: 90th percentile AQI 1261988: 90th percentile AQI 1401989: 90th percentile AQI 1151990: 90th percentile AQI 1051991: 90th percentile AQI 331992: 90th percentile AQI 1001993: 90th percentile AQI 1011994: 90th percentile AQI 1331995: 90th percentile AQI 1511996: 90th percentile AQI 1151997: 90th percentile AQI 1221998: 90th percentile AQI 1361999: 90th percentile AQI 1292000: 90th percentile AQI 1122001: 90th percentile AQI 1152002: 90th percentile AQI 1122003: 90th percentile AQI 1002004: 90th percentile AQI 972005: 90th percentile AQI 1192006: 90th percentile AQI 1122007: 90th percentile AQI 842008: 90th percentile AQI 842009: 90th percentile AQI 902010: 90th percentile AQI 742011: 90th percentile AQI 1122012: 90th percentile AQI 932013: 90th percentile AQI 972014: 90th percentile AQI 802015: 90th percentile AQI 772016: 90th percentile AQI 652017: 90th percentile AQI 672018: 90th percentile AQI 742019: 90th percentile AQI 672020: 90th percentile AQI 712021: 90th percentile AQI 772022: 90th percentile AQI 872023: 90th percentile AQI 932024: 90th percentile AQI 872025: 90th percentile AQI 871981: Median AQI 391982: Median AQI 381983: Median AQI 441984: Median AQI 421985: Median AQI 431986: Median AQI 421987: Median AQI 441988: Median AQI 481989: Median AQI 431990: Median AQI 381991: Median AQI 171992: Median AQI 331993: Median AQI 361994: Median AQI 441995: Median AQI 441996: Median AQI 441997: Median AQI 421998: Median AQI 441999: Median AQI 442000: Median AQI 352001: Median AQI 392002: Median AQI 382003: Median AQI 402004: Median AQI 372005: Median AQI 542006: Median AQI 522007: Median AQI 512008: Median AQI 512009: Median AQI 512010: Median AQI 492011: Median AQI 522012: Median AQI 512013: Median AQI 492014: Median AQI 482015: Median AQI 462016: Median AQI 442017: Median AQI 462018: Median AQI 422019: Median AQI 442020: Median AQI 442021: Median AQI 452022: Median AQI 472023: Median AQI 492024: Median AQI 472025: Median AQI 471981198619911996200120062011201620212025
  • 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
Ozone23464%
Fine particles (PM2.5)12935%
Nitrogen dioxide (NO₂)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025365211135172004787179Ozone
2024366210128253004787187Ozone
2023365200133275004993177Ozone
2022365209136191004787187Ozone
2021365222122183004577179Ozone
202036624511380004471142Ozone
2019365239114120004467133Ozone
201836525497131004274151Ozone
201736523811890004667133Ozone
2016366248107110004465143Ozone
2015365212132174004677172Ozone
2014365198154121004880156Ozone
2013365194139302004997161Ozone
2012366181153293005193174Ozone
201136517614233140052112192Ozone
2010365187166120004974143Ozone
2009365176160263005190164Ozone
2008366182165163005184164Ozone
2007365181160194105184201PM2.5
200636516815028181052112201Ozone
200536415215841121054119203Ozone
2004362284452310003797200Ozone
2003365259712690040100185Ozone
2002355273363493038112209Ozone
20013582595432121039115202Ozone
20003632764330122035112206Ozone
19993652317535195044129222Ozone
19983552117645212044136207Ozone
19973642476236154042122209Ozone
19963662397832161044115212Ozone
19953642247230299044151214Ozone
19943602277534231044133203Ozone
19933532724225122036101212Ozone
19923612685921112033100214Ozone
199133633420000173354Ozone
1990348256532883038105217Ozone
19893442167637132043115206Ozone
19883291748148260048140195Ozone
19873452157734163044126224Ozone
19863242156825151042115201Ozone
198533020558252715043161238Ozone
19843562325244208042143219Ozone
198334720764333211044156221Ozone
198231224246176103887205Ozone
19813172126124191039119212Ozone

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 1981–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem