Median AQI
47
Good
New Mexico · County air quality · 2025
Sandoval County, New Mexico
Median AQI 47 (Good). 64.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 47
- Median AQI
- 64.5%
- Good-air days
- 0
- Unhealthy days
- 22%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Sandoval County's air is good on balance, among the more polluted 10% of US counties, a median AQI of 47 with 64.5% of 268 monitored days in the Good band, driven mainly by Ozone.
- 47
- median AQI · Good
- 64.5%
- days rated Good
- Ozone
- main pollutant
- 22%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 93.
Data updated July 2026
- Good · 173 d · 64.6%
- Moderate · 95 d · 35.4%
How did Sandoval County's air break down in 2025?
Across 268 monitored days, 173 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 93 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 268 days monitored. Median AQI: 47 (Good).
Insights: Sandoval County, New Mexico. EPA monitors recorded a median Air Quality Index of 47 across 268 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 173 (65%) fell in the Good band (AQI 0–50), 95 (35%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 74, while the worst single-day peak hit 93 (Moderate). Residents averaged about 19.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (268 days). Across the 2020–2025 trend window, good days shifted by -98 and the median AQI moved +3 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 93, moderate but never Unhealthy. Nearby counties show comparable readings: Bernalillo (23.7% good, AQI 59); Catron (100.0% good, AQI 8); Chaves (94.4% good, AQI 16); Dona Ana (19.4% good, AQI 70); Eddy (46.9% good, AQI 51); Lea (61.5% good, AQI 47).
Air Quality Summary
Good Days
64.5%
173 of 268 monitored days
-10.5pp vs 75% target
Max AQI Recorded
93
Moderate
Health Grade
Moderate
90th-pct AQI 74
Sandoval County, Good days share 64.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Sandoval County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 268 monitored days across EPA AQI categories.
Good
173
65%
Moderate
95
35%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Sandoval County.
- Ozone · 268 days · 100.0%
Health Impact Assessment
Moderate
Sandoval County's air quality is rated Moderate based on 64.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 64.5% of monitored days in 2025, with a median AQI of 47. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 268 of 268 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Sandoval County. Best year: 2022 (295 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 271 | 82 | 5 | 0 | 44 | 119 |
| 2021 | 271 | 83 | 3 | 0 | 44 | 119 |
| 2022 | 295 | 64 | 1 | 0 | 43 | 101 |
| 2023 | 270 | 70 | 0 | 0 | 44 | 87 |
| 2024 | 271 | 90 | 2 | 0 | 44 | 122 |
| 2025 | 173 | 95 | 0 | 0 | 47 | 93 |
How does Sandoval County compare?
How Sandoval County compares
Good-day share worse than US avg
Sandoval County 64.5%
Bernalillo County, New Mexico 23.7%
US average 76.5%
Median AQI worse than US avg
Sandoval County 47
Bernalillo County, New Mexico 59
US average 38
Unhealthy days / yr about average
Sandoval County 0
Bernalillo County, New Mexico 3
US average 0
Other Counties in New Mexico
Air quality comparison for nearby counties in New Mexico.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Sandoval County.
Beaver County, Pennsylvania
AQI 47 · 54.3% good
Bell County, Texas
AQI 47 · 61.3% good
Bowie County, Texas
AQI 47 · 57.3% good
Bronx County, New York
AQI 47 · 56.6% good
Butte County, California
AQI 47 · 66.1% good
Calcasieu County, Louisiana
AQI 47 · 61.5% good
What Sandoval County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 47 means for exposure. Health guidance
- See how Sandoval County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Sandoval County with its New Mexico neighbours before drawing a conclusion about the region. All of New Mexico
Based on 268 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Sandoval County, New Mexico? ▼
Sandoval County has a median Air Quality Index (AQI) of 47, rated "Good." 64.5% of monitored days (173 out of 268) had good air quality in 2025.
What is the main pollutant in Sandoval County? ▼
The primary pollutant in Sandoval County is Ozone (O3), which was the main AQI driver on 268 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Sandoval County have? ▼
In 2025, Sandoval County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 93.
Is the air quality in Sandoval County getting better or worse? ▼
Air quality in Sandoval County is worsening based on 5-year trends (2020-2025). Best year: 2022 with 295 good days. Worst year: 2025 with 173 good days.
What does AQI 47 mean for health? ▼
Sandoval County's median AQI of 47 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Sandoval County compare to other counties in New Mexico? ▼
Sandoval County has 64.5% good air days. Nearby counties in New Mexico: Bernalillo (23.7% good), Catron (100.0% good), Chaves (94.4% good), Dona Ana (19.4% good), Eddy (46.9% good), Lea (61.5% good).
What is the 90th percentile AQI in Sandoval County? ▼
The 90th percentile AQI for Sandoval County is 74, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 93 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.