EnviroNearby

Cameron County, Texas air quality history

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

30%
Good days in 2025
57
Median daily AQI, 2025
8
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 Cameron, Texas on 365 days. 109 of those days (30%) were in the Good range, and the median daily AQI was 57. 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 315 days. Across the years with fuller monitoring, the share of Good days fell: an average of 95% in 1993–1995 versus 34% in 2023–2025.

Years with fewer than 120 monitored days (1980, 1989, 1990, 1991, 1992) are shown in the table but left out of comparisons and trend statements.

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 36 of 36 days19801989: Good 27 of 29 days1989: Moderate 2 of 29 days1990: Good 60 of 60 days1991: Good 55 of 60 days1991: Moderate 5 of 60 days1992: Good 55 of 59 days1992: Moderate 4 of 59 days1993: Good 140 of 145 days1993: Moderate 5 of 145 days19931994: Good 324 of 342 days1994: Moderate 14 of 342 days1994: Unhealthy for Sensitive Groups 4 of 342 days1995: Good 329 of 356 days1995: Moderate 24 of 356 days1995: Unhealthy for Sensitive Groups 3 of 356 days1996: Good 352 of 365 days1996: Moderate 12 of 365 days1996: Unhealthy for Sensitive Groups 1 of 365 days1997: Good 337 of 363 days1997: Moderate 24 of 363 days1997: Unhealthy for Sensitive Groups 2 of 363 days1998: Good 327 of 365 days1998: Moderate 34 of 365 days1998: Unhealthy for Sensitive Groups 3 of 365 days1998: Unhealthy 1 of 365 days19981999: Good 337 of 364 days1999: Moderate 27 of 364 days2000: Good 304 of 366 days2000: Moderate 61 of 366 days2000: Unhealthy for Sensitive Groups 1 of 366 days2001: Good 277 of 365 days2001: Moderate 87 of 365 days2001: Unhealthy for Sensitive Groups 1 of 365 days2002: Good 263 of 365 days2002: Moderate 99 of 365 days2002: Unhealthy for Sensitive Groups 3 of 365 days2003: Good 253 of 365 days2003: Moderate 107 of 365 days2003: Unhealthy for Sensitive Groups 5 of 365 days20032004: Good 288 of 366 days2004: Moderate 75 of 366 days2004: Unhealthy for Sensitive Groups 2 of 366 days2004: Unhealthy 1 of 366 days2005: Good 139 of 361 days2005: Moderate 218 of 361 days2005: Unhealthy for Sensitive Groups 4 of 361 days2006: Good 165 of 365 days2006: Moderate 199 of 365 days2006: Unhealthy for Sensitive Groups 1 of 365 days2007: Good 164 of 363 days2007: Moderate 198 of 363 days2007: Unhealthy for Sensitive Groups 1 of 363 days2008: Good 149 of 362 days2008: Moderate 210 of 362 days2008: Unhealthy for Sensitive Groups 3 of 362 days20082009: Good 156 of 365 days2009: Moderate 209 of 365 days2010: Good 197 of 361 days2010: Moderate 162 of 361 days2010: Unhealthy for Sensitive Groups 2 of 361 days2011: Good 168 of 365 days2011: Moderate 196 of 365 days2011: Unhealthy for Sensitive Groups 1 of 365 days2012: Good 173 of 366 days2012: Moderate 193 of 366 days2013: Good 196 of 365 days2013: Moderate 169 of 365 days20132014: Good 173 of 365 days2014: Moderate 192 of 365 days2015: Good 197 of 365 days2015: Moderate 166 of 365 days2015: Unhealthy for Sensitive Groups 2 of 365 days2016: Good 220 of 366 days2016: Moderate 144 of 366 days2016: Unhealthy for Sensitive Groups 2 of 366 days2017: Good 259 of 365 days2017: Moderate 106 of 365 days2018: Good 178 of 365 days2018: Moderate 187 of 365 days20182019: Good 172 of 365 days2019: Moderate 193 of 365 days2020: Good 158 of 366 days2020: Moderate 199 of 366 days2020: Unhealthy for Sensitive Groups 6 of 366 days2020: Unhealthy 3 of 366 days2021: Good 162 of 365 days2021: Moderate 203 of 365 days2022: Good 191 of 365 days2022: Moderate 171 of 365 days2022: Unhealthy for Sensitive Groups 3 of 365 days2023: Good 161 of 365 days2023: Moderate 198 of 365 days2023: Unhealthy for Sensitive Groups 6 of 365 days20232024: Good 99 of 366 days2024: Moderate 206 of 366 days2024: Unhealthy for Sensitive Groups 48 of 366 days2024: Unhealthy 13 of 366 days2025: Good 109 of 365 days2025: Moderate 248 of 365 days2025: Unhealthy for Sensitive Groups 8 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 361989: 90th percentile AQI 471990: 90th percentile AQI 371991: 90th percentile AQI 431992: 90th percentile AQI 471993: 90th percentile AQI 331994: 90th percentile AQI 441995: 90th percentile AQI 481996: 90th percentile AQI 411997: 90th percentile AQI 461998: 90th percentile AQI 531999: 90th percentile AQI 472000: 90th percentile AQI 552001: 90th percentile AQI 602002: 90th percentile AQI 612003: 90th percentile AQI 662004: 90th percentile AQI 572005: 90th percentile AQI 712006: 90th percentile AQI 712007: 90th percentile AQI 692008: 90th percentile AQI 722009: 90th percentile AQI 712010: 90th percentile AQI 682011: 90th percentile AQI 712012: 90th percentile AQI 652013: 90th percentile AQI 712014: 90th percentile AQI 692015: 90th percentile AQI 702016: 90th percentile AQI 672017: 90th percentile AQI 612018: 90th percentile AQI 672019: 90th percentile AQI 672020: 90th percentile AQI 742021: 90th percentile AQI 702022: 90th percentile AQI 702023: 90th percentile AQI 772024: 90th percentile AQI 1242025: 90th percentile AQI 761980: Median AQI 281989: Median AQI 261990: Median AQI 221991: Median AQI 241992: Median AQI 261993: Median AQI 141994: Median AQI 251995: Median AQI 301996: Median AQI 231997: Median AQI 311998: Median AQI 291999: Median AQI 262000: Median AQI 312001: Median AQI 382002: Median AQI 422003: Median AQI 402004: Median AQI 392005: Median AQI 532006: Median AQI 522007: Median AQI 522008: Median AQI 532009: Median AQI 522010: Median AQI 482011: Median AQI 522012: Median AQI 512013: Median AQI 492014: Median AQI 512015: Median AQI 482016: Median AQI 452017: Median AQI 422018: Median AQI 512019: Median AQI 522020: Median AQI 522021: Median AQI 522022: Median AQI 482023: Median AQI 542024: Median AQI 612025: Median AQI 57198019931998200320082013201820232025
  • 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)31586%
Ozone5014%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536510924880005776139PM2.5
20243669920648130061124171PM2.5
202336516119860005477141PM2.5
202236519117130004870120PM2.5
20213651622030000527099PM2.5
202036615819963005274184PM2.5
20193651721930000526791PM2.5
20183651781870000516799PM2.5
20173652591060000426187PM2.5
201636622014420004567110PM2.5
201536519716620004870108PM2.5
20143651731920000516999PM2.5
20133651961690000497196PM2.5
20123661731930000516587PM2.5
201136516819610005271104PM2.5
201036119716220004868105PM2.5
20093651562090000527189PM2.5
200836214921030005372112PM2.5
200736316419810005269101PM2.5
200636516519910005271101PM2.5
200536113921840005371133PM2.5
20043662887521003957151Ozone
200336525310750004066123Ozone
20023652639930004261140Ozone
20013652778710003860108Ozone
20003663046110003155101Ozone
1999364337270000264793Ozone
19983653273431002953159Ozone
19973633372420003146112Ozone
19963653521210002341101Ozone
19953563292430003048119Ozone
19943423241440002544140Ozone
199314514050000143359CO
1992595540000264766PM10
1991605550000244364PM10
1990606000000223750PM10
1989292720000264777PM10
1980363600000283640Ozone

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