Metro area air quality · 2025

Grand Junction, CO

Median AQI 47 (Good). 67.4% of monitored days rated Good across this metro's EPA monitoring network.

47
Median AQI
67.4%
Good-air days
0
Unhealthy days
39%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 273 monitored days. EPA AQS →

The verdict

The Grand Junction, CO metro runs good on the EPA scale, more polluted than the median US metro, a median AQI of 47 with 67.4% of 273 monitored days in the Good band.

47
median AQI · Good
67.4%
days rated Good
39%
cleaner than US metros
90
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Insights: Grand Junction, CO metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 47 over 273 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 184 Good days (67%), 89 Moderate (33%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 64 while the highest single-day reading hit 90 (Moderate). Metro residents averaged roughly 20.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -78 and the median AQI moved +3 points, which classifies the multi-year trajectory as worsening. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Ardmore, OK (65.3% good, AQI 47); Baltimore-Columbia-Towson, MD (62.2% good, AQI 47); Boise City, ID (64.7% good, AQI 47).

Air Quality Summary

Median AQI

47

Good

Good Days

67.4%

184 of 273 days

Max AQI

90

Moderate

Health Grade

Moderate

90th pct: 64

AQI Day Breakdown (2025)

Distribution of 273 monitored days across EPA AQI categories.

Good

184

67%

Moderate

89

33%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Grand Junction, CO metro area's air quality is rated Moderate based on 67.4% good air days. No unhealthy air days were recorded in 2025.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Grand Junction, CO metro compare?

How Grand Junction, CO compares

Good-day share worse than US avg
Grand Junction, CO 67.4%
Ardmore, OK 65.3%
US average 71.3%
Median AQI worse than US avg
Grand Junction, CO 47
Ardmore, OK 47
US average 41
Unhealthy days / yr better than US avg
Grand Junction, CO 0
Ardmore, OK 2
US average 1

5-Year Air Quality Trend

Air quality is worsening in the Grand Junction, CO metro. Best year: 2022 (282 good days).

Year Good Moderate Unhealthy Median AQI
2020 262 101 0 44
2021 247 116 0 46
2022 282 82 0 44
2023 246 119 0 46
2024 215 144 0 48
2025 184 89 0 47

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Grand Junction, CO.

Ardmore, OK

AQI 47 · 65.3% good

47

Baltimore-Columbia-Towson, MD

AQI 47 · 62.2% good

47

Boise City, ID

AQI 47 · 64.7% good

47

Cheyenne, WY

AQI 47 · 69.8% good

47

Chico, CA

AQI 47 · 66.1% good

47

Columbus, GA-AL

AQI 47 · 58.8% good

47

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Grand Junction, CO metro area? ▼
The Grand Junction, CO metro area has a median Air Quality Index (AQI) of 47, rated "Good." 67.4% of monitored days (184 out of 273) had good air quality in 2025.
How many unhealthy air days does Grand Junction, CO have? ▼
In 2025, the Grand Junction, CO metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 90.
Is air quality in Grand Junction, CO getting better or worse? ▼
Air quality in the Grand Junction, CO metro is worsening based on 5-year trends (2020-2025). Best year: 2022 with 282 good days. Worst year: 2025 with 184 good days.
What does AQI 47 mean for health? ▼
An AQI of 47 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Grand Junction, CO? ▼
The 90th percentile AQI for the Grand Junction, CO metro area is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 90 (Moderate).
How does Grand Junction, CO compare to other metro areas? ▼
The Grand Junction, CO metro has 67.4% good air days. Similar metros: Ardmore, OK (65.3% good), Baltimore-Columbia-Towson, MD (62.2% good), Boise City, ID (64.7% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025

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.