EnviroNearby

Bexar County, Texas air quality history

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

43%
Good days in 2025
52
Median daily AQI, 2025
11
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 Bexar, Texas on 365 days. 158 of those days (43%) were in the Good range, and the median daily AQI was 52. 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 fine particles (PM2.5) on 203 days. Across the years with fuller monitoring, the share of Good days fell: an average of 71% in 1980–1982 versus 45% 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 365 days1980: Moderate 98 of 365 days1980: Unhealthy for Sensitive Groups 24 of 365 days1980: Unhealthy 9 of 365 days1980: Very Unhealthy 1 of 365 days19801981: Good 273 of 364 days1981: Moderate 70 of 364 days1981: Unhealthy for Sensitive Groups 16 of 364 days1981: Unhealthy 4 of 364 days1981: Very Unhealthy 1 of 364 days1982: Good 272 of 364 days1982: Moderate 61 of 364 days1982: Unhealthy for Sensitive Groups 20 of 364 days1982: Unhealthy 10 of 364 days1982: Very Unhealthy 1 of 364 days1983: Good 232 of 365 days1983: Moderate 100 of 365 days1983: Unhealthy for Sensitive Groups 28 of 365 days1983: Unhealthy 3 of 365 days1983: Very Unhealthy 2 of 365 days1984: Good 244 of 366 days1984: Moderate 95 of 366 days1984: Unhealthy for Sensitive Groups 20 of 366 days1984: Unhealthy 5 of 366 days1984: Very Unhealthy 2 of 366 days1985: Good 272 of 365 days1985: Moderate 78 of 365 days1985: Unhealthy for Sensitive Groups 12 of 365 days1985: Unhealthy 3 of 365 days19851986: Good 240 of 365 days1986: Moderate 103 of 365 days1986: Unhealthy for Sensitive Groups 18 of 365 days1986: Unhealthy 3 of 365 days1986: Very Unhealthy 1 of 365 days1987: Good 255 of 365 days1987: Moderate 89 of 365 days1987: Unhealthy for Sensitive Groups 16 of 365 days1987: Unhealthy 4 of 365 days1987: Very Unhealthy 1 of 365 days1988: Good 280 of 366 days1988: Moderate 66 of 366 days1988: Unhealthy for Sensitive Groups 15 of 366 days1988: Unhealthy 4 of 366 days1988: Very Unhealthy 1 of 366 days1989: Good 279 of 363 days1989: Moderate 65 of 363 days1989: Unhealthy for Sensitive Groups 16 of 363 days1989: Unhealthy 3 of 363 days1990: Good 299 of 365 days1990: Moderate 49 of 365 days1990: Unhealthy for Sensitive Groups 13 of 365 days1990: Unhealthy 4 of 365 days19901991: Good 299 of 364 days1991: Moderate 45 of 364 days1991: Unhealthy for Sensitive Groups 18 of 364 days1991: Unhealthy 2 of 364 days1992: Good 323 of 366 days1992: Moderate 33 of 366 days1992: Unhealthy for Sensitive Groups 9 of 366 days1992: Unhealthy 1 of 366 days1993: Good 322 of 365 days1993: Moderate 31 of 365 days1993: Unhealthy for Sensitive Groups 9 of 365 days1993: Unhealthy 3 of 365 days1994: Good 299 of 365 days1994: Moderate 46 of 365 days1994: Unhealthy for Sensitive Groups 16 of 365 days1994: Unhealthy 4 of 365 days1995: Good 266 of 365 days1995: Moderate 52 of 365 days1995: Unhealthy for Sensitive Groups 33 of 365 days1995: Unhealthy 13 of 365 days1995: Very Unhealthy 1 of 365 days19951996: Good 315 of 364 days1996: Moderate 37 of 364 days1996: Unhealthy for Sensitive Groups 9 of 364 days1996: Unhealthy 3 of 364 days1997: Good 289 of 365 days1997: Moderate 55 of 365 days1997: Unhealthy for Sensitive Groups 18 of 365 days1997: Unhealthy 3 of 365 days1998: Good 247 of 365 days1998: Moderate 91 of 365 days1998: Unhealthy for Sensitive Groups 19 of 365 days1998: Unhealthy 7 of 365 days1998: Very Unhealthy 1 of 365 days1999: Good 223 of 365 days1999: Moderate 107 of 365 days1999: Unhealthy for Sensitive Groups 27 of 365 days1999: Unhealthy 8 of 365 days2000: Good 175 of 366 days2000: Moderate 168 of 366 days2000: Unhealthy for Sensitive Groups 20 of 366 days2000: Unhealthy 3 of 366 days20002001: Good 173 of 365 days2001: Moderate 174 of 365 days2001: Unhealthy for Sensitive Groups 17 of 365 days2001: Unhealthy 1 of 365 days2002: Good 148 of 365 days2002: Moderate 180 of 365 days2002: Unhealthy for Sensitive Groups 22 of 365 days2002: Unhealthy 12 of 365 days2002: Very Unhealthy 3 of 365 days2003: Good 208 of 365 days2003: Moderate 124 of 365 days2003: Unhealthy for Sensitive Groups 26 of 365 days2003: Unhealthy 6 of 365 days2003: Very Unhealthy 1 of 365 days2004: Good 271 of 366 days2004: Moderate 72 of 366 days2004: Unhealthy for Sensitive Groups 16 of 366 days2004: Unhealthy 7 of 366 days2005: Good 120 of 365 days2005: Moderate 218 of 365 days2005: Unhealthy for Sensitive Groups 23 of 365 days2005: Unhealthy 4 of 365 days20052006: Good 139 of 365 days2006: Moderate 194 of 365 days2006: Unhealthy for Sensitive Groups 28 of 365 days2006: Unhealthy 4 of 365 days2007: Good 122 of 365 days2007: Moderate 235 of 365 days2007: Unhealthy for Sensitive Groups 7 of 365 days2007: Unhealthy 1 of 365 days2008: Good 122 of 366 days2008: Moderate 230 of 366 days2008: Unhealthy for Sensitive Groups 14 of 366 days2009: Good 134 of 365 days2009: Moderate 223 of 365 days2009: Unhealthy for Sensitive Groups 7 of 365 days2009: Unhealthy 1 of 365 days2010: Good 167 of 365 days2010: Moderate 187 of 365 days2010: Unhealthy for Sensitive Groups 9 of 365 days2010: Unhealthy 2 of 365 days20102011: Good 141 of 365 days2011: Moderate 202 of 365 days2011: Unhealthy for Sensitive Groups 20 of 365 days2011: Unhealthy 2 of 365 days2012: Good 138 of 366 days2012: Moderate 212 of 366 days2012: Unhealthy for Sensitive Groups 12 of 366 days2012: Unhealthy 4 of 366 days2013: Good 149 of 365 days2013: Moderate 199 of 365 days2013: Unhealthy for Sensitive Groups 15 of 365 days2013: Unhealthy 2 of 365 days2014: Good 129 of 365 days2014: Moderate 230 of 365 days2014: Unhealthy for Sensitive Groups 6 of 365 days2015: Good 139 of 365 days2015: Moderate 212 of 365 days2015: Unhealthy for Sensitive Groups 11 of 365 days2015: Unhealthy 3 of 365 days20152016: Good 199 of 366 days2016: Moderate 161 of 366 days2016: Unhealthy for Sensitive Groups 5 of 366 days2016: Unhealthy 1 of 366 days2017: Good 186 of 363 days2017: Moderate 171 of 363 days2017: Unhealthy for Sensitive Groups 4 of 363 days2017: Unhealthy 1 of 363 days2017: Very Unhealthy 1 of 363 days2018: Good 187 of 365 days2018: Moderate 167 of 365 days2018: Unhealthy for Sensitive Groups 10 of 365 days2018: Unhealthy 1 of 365 days2019: Good 117 of 365 days2019: Moderate 243 of 365 days2019: Unhealthy for Sensitive Groups 4 of 365 days2019: Unhealthy 1 of 365 days2020: Good 119 of 366 days2020: Moderate 237 of 366 days2020: Unhealthy for Sensitive Groups 9 of 366 days2020: Unhealthy 1 of 366 days20202021: Good 113 of 365 days2021: Moderate 240 of 365 days2021: Unhealthy for Sensitive Groups 12 of 365 days2022: Good 116 of 365 days2022: Moderate 236 of 365 days2022: Unhealthy for Sensitive Groups 12 of 365 days2022: Very Unhealthy 1 of 365 days2023: Good 164 of 365 days2023: Moderate 189 of 365 days2023: Unhealthy for Sensitive Groups 10 of 365 days2023: Unhealthy 1 of 365 days2023: Hazardous 1 of 365 days2024: Good 174 of 366 days2024: Moderate 170 of 366 days2024: Unhealthy for Sensitive Groups 20 of 366 days2024: Unhealthy 2 of 366 days2025: Good 158 of 365 days2025: Moderate 196 of 365 days2025: Unhealthy for Sensitive Groups 10 of 365 days2025: Unhealthy 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 1001981: 90th percentile AQI 771982: 90th percentile AQI 931983: 90th percentile AQI 931984: 90th percentile AQI 931985: 90th percentile AQI 691986: 90th percentile AQI 841987: 90th percentile AQI 771988: 90th percentile AQI 841989: 90th percentile AQI 771990: 90th percentile AQI 671991: 90th percentile AQI 711992: 90th percentile AQI 541993: 90th percentile AQI 541994: 90th percentile AQI 741995: 90th percentile AQI 1151996: 90th percentile AQI 611997: 90th percentile AQI 771998: 90th percentile AQI 931999: 90th percentile AQI 1002000: 90th percentile AQI 802001: 90th percentile AQI 842002: 90th percentile AQI 1012003: 90th percentile AQI 972004: 90th percentile AQI 842005: 90th percentile AQI 932006: 90th percentile AQI 972007: 90th percentile AQI 732008: 90th percentile AQI 802009: 90th percentile AQI 772010: 90th percentile AQI 742011: 90th percentile AQI 862012: 90th percentile AQI 802013: 90th percentile AQI 792014: 90th percentile AQI 772015: 90th percentile AQI 782016: 90th percentile AQI 672017: 90th percentile AQI 702018: 90th percentile AQI 712019: 90th percentile AQI 742020: 90th percentile AQI 802021: 90th percentile AQI 802022: 90th percentile AQI 802023: 90th percentile AQI 792024: 90th percentile AQI 872025: 90th percentile AQI 801980: Median AQI 441981: Median AQI 381982: Median AQI 381983: Median AQI 461984: Median AQI 441985: Median AQI 401986: Median AQI 441987: Median AQI 401988: Median AQI 381989: Median AQI 381990: Median AQI 371991: Median AQI 341992: Median AQI 331993: Median AQI 311994: Median AQI 351995: Median AQI 401996: Median AQI 351997: Median AQI 381998: Median AQI 441999: Median AQI 452000: Median AQI 512001: Median AQI 512002: Median AQI 532003: Median AQI 472004: Median AQI 412005: Median AQI 542006: Median AQI 542007: Median AQI 542008: Median AQI 542009: Median AQI 542010: Median AQI 512011: Median AQI 532012: Median AQI 532013: Median AQI 532014: Median AQI 542015: Median AQI 532016: Median AQI 492017: Median AQI 502018: Median AQI 492019: Median AQI 552020: Median AQI 552021: Median AQI 552022: Median AQI 552023: Median AQI 522024: Median AQI 522025: Median AQI 521980198519901995200020052010201520202025
  • 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)20356%
Ozone15242%
Coarse particles (PM10)62%
Nitrogen dioxide (NO₂)41%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025365158196101005280154PM2.5
2024366174170202005287199PM2.5
2023365164189101015279309PM2.5
2022365116236120105580214PM2.5
2021365113240120005580147PM2.5
202036611923791005580160PM2.5
201936511724341005574175PM2.5
2018365187167101004971166PM2.5
201736318617141105070203PM2.5
201636619916151004967164PM2.5
2015365139212113005378156PM2.5
201436512923060005477136PM2.5
2013365149199152005379154PM2.5
2012366138212124005380161PM2.5
2011365141202202005386154PM2.5
201036516718792005174154PM2.5
200936513422371005477161PM2.5
2008366122230140005480140PM2.5
200736512223571005473159PM2.5
2006365139194284005497169PM2.5
2005365120218234005493164PM2.5
200436627172167004184174Ozone
2003365208124266104797202Ozone
200236514818022123053101206PM2.5
2001365173174171005184161PM2.5
2000366175168203005180169PM2.5
19993652231072780045100187Ozone
199836524791197104493205Ozone
199736528955183003877177Ozone
19963643153793003561182Ozone
19953652665233131040115203Ozone
199436529946164003574195Ozone
19933653223193003154164Ozone
19923663233391003354159Ozone
199136429945182003471169Ozone
199036529949134003767174Ozone
198936327965163003877190Ozone
198836628066154103884221Ozone
198736525589164104077201Ozone
1986365240103183104484207Ozone
198536527278123004069195Ozone
198436624495205204493202Ozone
1983365232100283204693221Ozone
1982364272612010103893202Ozone
198136427370164103877208Ozone
1980365233982491044100207Ozone

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