Median AQI
44
Good
New Mexico · County air quality · 2025
Valencia County, New Mexico
Median AQI 44 (Good). 75.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 75.3%
- Good-air days
- 0
- Unhealthy days
- 45%
- Cleaner than US counties
Valencia County's 2025 annual median AQI is 44 (Good), with 75.3% Good days
According to the U.S. EPA Air Quality System, Valencia County, New Mexico posted a 2025 median AQI of 44 (Good) across 360 monitored days, with 75.3% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Valencia County's 75.3% Good-day share places it cleaner than 45% of US counties in 2025.
- Closest median-AQI peer
- Allegan County (63.9% Good, median AQI 44) is the closest nationwide median-AQI peer to Valencia County.
- 2020–2025 trend
- Valencia County's floor-qualifying Good-day share is worsening from 2020 to 2025 (78.8% → 75.3%).
- Median AQI
- Median AQI: 44
The verdict
According to EPA Air Quality System monitoring data, Valencia County's air is good on balance, more polluted than the median US county, a median AQI of 44 with 75.3% of 360 monitored days in the Good band, driven mainly by Ozone.
- 44
- median AQI · Good
- 75.3%
- days rated Good
- Ozone
- main pollutant
- 45%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 97.
Annual release change
What changed in the 2025 EPA annual release
- Valencia County's Good-day share fell from 83.8% to 75.3% between the 2024 and 2025 EPA annual releases, a change of -8.5 percentage points.
Data updated August 2026
- Good · 271 d · 75.3%
- Moderate · 89 d · 24.7%
How did Valencia County's air break down in 2025?
Across 360 monitored days, 271 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 97 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 360 days monitored. Median AQI: 44 (Good).
Insights: Valencia County, New Mexico. EPA monitors recorded a median Air Quality Index of 44 across 360 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 271 (75%) fell in the Good band (AQI 0–50), 89 (25%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 64, while the worst single-day peak hit 97 (Moderate). Residents averaged about 22.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (360 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -3.6 points and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 97, moderate but never Unhealthy. Nearby counties show comparable readings: Bernalillo (26.6% good, AQI 58); Catron (71.7% good, AQI 45); Chaves (91.9% good, AQI 29); Dona Ana (27.4% good, AQI 61); Eddy (53.7% good, AQI 49); Lea (68.8% good, AQI 44).
Air Quality Summary
Good Days
75.3%
271 of 360 monitored days
0.3pp vs 75% target
Max AQI Recorded
97
Moderate
Health Grade
Good
90th-pct AQI 64
Valencia County, Good days share 75.3%
National avg
Share of monitored days at AQI 0-50 (Good band).
Valencia 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 360 monitored days across EPA AQI categories.
Good
271
75%
Moderate
89
25%
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 Valencia County.
- Ozone · 360 days · 100.0%
Health Impact Assessment
Good
Valencia County's air quality is rated Good based on 75.3% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 75.3% of monitored days in 2025, with a median AQI of 44. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 360 of 360 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Valencia County. Highest Good-day share: 2022 (87.8%, 317 of 361 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 283 | 74 | 2 | 0 | 44 | 105 |
| 2021 | 295 | 59 | 2 | 0 | 43 | 136 |
| 2022 | 317 | 44 | 0 | 0 | 41 | 93 |
| 2023 | 289 | 72 | 0 | 0 | 42 | 87 |
| 2024 | 300 | 56 | 2 | 0 | 43 | 105 |
| 2025 | 271 | 89 | 0 | 0 | 44 | 97 |
How does Valencia County compare?
How Valencia County compares
Good-day share worse than typical
Valencia County 75.3%
Allegan County, Michigan 63.9%
Typical US county 76.0%
Median AQI worse than typical
Valencia County 44
Allegan County, Michigan 44
Typical US county 39
Unhealthy days / yr better than typical
Valencia County 0
Allegan County, Michigan 2
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Valencia County (44), not geographic neighbors.
Allegan County, Michigan
Median AQI 44 · 63.9% Good-day share
Allen County, Indiana
Median AQI 44 · 60.0% Good-day share
Baker County, Florida
Median AQI 44 · 69.5% Good-day share
Bay County, Florida
Median AQI 44 · 66.4% Good-day share
Blount County, Tennessee
Median AQI 44 · 71.5% Good-day share
Cache County, Utah
Median AQI 44 · 66.0% Good-day share
Same primary pollutant: Ozone
Ozone led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Forest County, Wisconsin
75.1% Good-day share · median AQI 39
Laramie County, Wyoming
75.1% Good-day share · median AQI 45
Montezuma County, Colorado
75.1% Good-day share · median AQI 45
Washington County, Utah
75.1% Good-day share · median AQI 44
Harford County, Maryland
75.5% Good-day share · median AQI 42
Trego County, Kansas
75.5% Good-day share · median AQI 41
New Mexico counties on the map
Geographic containment only, other monitored counties in New Mexico, independent of AQI or pollutant match.
What Valencia 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 44 means for exposure. Health guidance
- See how Valencia County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Valencia County with its New Mexico neighbours before drawing a conclusion about the region. All of New Mexico
Based on 360 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Valencia County, New Mexico? ▼
Valencia County has a median Air Quality Index (AQI) of 44, rated "Good." 75.3% of monitored days (271 out of 360) had good air quality in 2025.
What is the main pollutant in Valencia County? ▼
The primary pollutant in Valencia County is Ozone (O3), which was the main AQI driver on 360 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Valencia County have? ▼
In 2025, Valencia County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 97.
Is the air quality in Valencia County getting better or worse? ▼
Air quality in Valencia County is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2022 at 87.8% (317 of 361 days). Lowest qualifying Good-day share: 2025 at 75.3% (271 of 360 days).
What does AQI 44 mean for health? ▼
Valencia County's median AQI of 44 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Valencia County compare to other counties in New Mexico? ▼
Valencia County has 75.3% good air days. Nearby counties in New Mexico: Bernalillo (26.6% good), Catron (71.7% good), Chaves (91.9% good), Dona Ana (27.4% good), Eddy (53.7% good), Lea (68.8% good).
What is the 90th percentile AQI in Valencia County? ▼
The 90th percentile AQI for Valencia County is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 97 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Valencia County, New Mexico · 2020–2025
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Every figure on PlainAirData 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.