EnviroNearby

Rio Arriba County, New Mexico air quality history

Daily Air Quality Index summaries from EPA monitors in Rio Arriba, New Mexico, 2000–2025.

85%
Good days in 2025
44
Median daily AQI, 2025
0
Days above 100 in 2025
359
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Rio Arriba, New Mexico on 359 days. 306 of those days (85%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in New Mexico (median 44 across 13 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 353 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 81% in 2013–2015 versus 82% in 2023–2025.

Years with fewer than 120 monitored days (2007, 2008, 2009, 2010, 2011, 2012…) 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%2000: Good 44 of 45 days2000: Moderate 1 of 45 days20002001: Good 102 of 103 days2001: Moderate 1 of 103 days2002: Good 96 of 96 days20022003: Good 95 of 98 days2003: Moderate 3 of 98 days2004: Good 110 of 110 days20042005: Good 104 of 105 days2005: Moderate 1 of 105 days2006: Good 110 of 111 days2006: Moderate 1 of 111 days20062007: Good 108 of 109 days2007: Moderate 1 of 109 days2008: Good 108 of 110 days2008: Moderate 2 of 110 days20082009: Good 111 of 111 days2010: Good 103 of 104 days2010: Moderate 1 of 104 days20102011: Good 104 of 112 days2011: Moderate 8 of 112 days2012: Good 101 of 101 days20122013: Good 237 of 295 days2013: Moderate 56 of 295 days2013: Unhealthy for Sensitive Groups 2 of 295 days2014: Good 286 of 363 days2014: Moderate 77 of 363 days20142015: Good 299 of 361 days2015: Moderate 62 of 361 days2016: Good 304 of 362 days2016: Moderate 58 of 362 days20162017: Good 269 of 360 days2017: Moderate 88 of 360 days2017: Unhealthy for Sensitive Groups 3 of 360 days2018: Good 246 of 362 days2018: Moderate 113 of 362 days2018: Unhealthy for Sensitive Groups 3 of 362 days20182019: Good 315 of 358 days2019: Moderate 43 of 358 days2020: Good 313 of 362 days2020: Moderate 49 of 362 days20202021: Good 276 of 363 days2021: Moderate 86 of 363 days2021: Unhealthy for Sensitive Groups 1 of 363 days2022: Good 304 of 331 days2022: Moderate 26 of 331 days2022: Unhealthy for Sensitive Groups 1 of 331 days20222023: Good 318 of 346 days2023: Moderate 28 of 346 days2024: Good 252 of 359 days2024: Moderate 104 of 359 days2024: Unhealthy for Sensitive Groups 3 of 359 days20242025: Good 306 of 359 days2025: Moderate 53 of 359 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 year0501002000: 90th percentile AQI 232001: 90th percentile AQI 262002: 90th percentile AQI 312003: 90th percentile AQI 302004: 90th percentile AQI 232005: 90th percentile AQI 262006: 90th percentile AQI 232007: 90th percentile AQI 262008: 90th percentile AQI 292009: 90th percentile AQI 222010: 90th percentile AQI 222011: 90th percentile AQI 342012: 90th percentile AQI 282013: 90th percentile AQI 612014: 90th percentile AQI 582015: 90th percentile AQI 582016: 90th percentile AQI 542017: 90th percentile AQI 672018: 90th percentile AQI 772019: 90th percentile AQI 542020: 90th percentile AQI 542021: 90th percentile AQI 642022: 90th percentile AQI 492023: 90th percentile AQI 492024: 90th percentile AQI 742025: 90th percentile AQI 542000: Median AQI 102001: Median AQI 132002: Median AQI 142003: Median AQI 152004: Median AQI 122005: Median AQI 122006: Median AQI 112007: Median AQI 122008: Median AQI 142009: Median AQI 122010: Median AQI 122011: Median AQI 122012: Median AQI 162013: Median AQI 442014: Median AQI 442015: Median AQI 422016: Median AQI 442017: Median AQI 452018: Median AQI 462019: Median AQI 432020: Median AQI 442021: Median AQI 442022: Median AQI 402023: Median AQI 432024: Median AQI 452025: Median AQI 4420002002200420062008201020122014201620182020202220242025
  • 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
Ozone35398%
Fine particles (PM2.5)62%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025359306530000445487Ozone
202435925210430004574108Ozone
2023346318280000434971Ozone
20223313042610004049105Ozone
20213632768610004464143Ozone
2020362313490000445490Ozone
2019358315430000435490Ozone
201836224611330004677126Ozone
20173602698830004567105Ozone
2016362304580000445480Ozone
2015361299620000425890Ozone
2014363286770000445893Ozone
20132952375620004461112Ozone
201210110100000162846PM2.5
201111210480000123485PM2.5
201010410310000122252PM2.5
200911111100000122239PM2.5
200811010820000142954PM2.5
200710910810000122655PM2.5
200611111010000112355PM2.5
200510510410000122658PM2.5
200411011000000122333PM2.5
2003989530000153053PM2.5
2002969600000143143PM2.5
200110310210000132658PM2.5
2000454410000102351PM2.5

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 New Mexico with a similar median AQI in 2025

All monitored counties in New Mexico

Source: U.S. EPA AirData, “Annual AQI by County” files for 2000–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem