Metro area air quality · 2025
Idaho Falls, ID
Median AQI 43 (Good). 85.2% of monitored days rated Good across this metro's EPA monitoring network.
- 43
- Median AQI
- 85.2%
- Good-air days
- 0
- Unhealthy days
- 78%
- Cleaner than US metros
Idaho Falls, ID posted a 2025 median AQI of 43 (Good) with 85.2% Good days
According to the U.S. EPA Air Quality System, the Idaho Falls, ID CBSA recorded a median AQI of 43 across 365 monitored days in 2025, with 85.2% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The Idaho Falls, ID CBSA's 85.2% Good-day share places it cleaner than 78% of US metros in 2025.
- Closest median-AQI peer
- Ashtabula, OH (81.2% Good, median AQI 43) is the closest nationwide median-AQI peer to Idaho Falls, ID.
- 2020–2025 Good-day shift
- Idaho Falls, ID's Good-day share moved +5.5 points from 2020 to 2025 (median AQI +2).
- Median AQI
- Median AQI: 43
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
Idaho Falls, ID sits in the upper Good-day tercile among EPA CBSA metros on this site (85.2% of 365 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 43 and 85.2% of 365 monitored days in the Good band.
- 43
- median AQI · Good
- 85.2%
- days rated Good
- 78%
- cleaner than US metros
- 95
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Idaho Falls, ID metro's Good-day share rose from 79.5% to 85.2% between the 2024 and 2025 EPA annual releases, a change of +5.7 percentage points.
Idaho Falls, ID sits in the upper Good-day tercile among EPA CBSA metros on this site (85.2% of 365 monitored days). Signature read: 85.2% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 43 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 311 Good (85%), 54 Moderate (15%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 54; the highest single-day reading hit 95 (Moderate).
Across 2020–2025, Good-day share shifted +5.5 points and median AQI moved +2 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Ashtabula, OH (81.2% good, AQI 43); Bloomington, IN (67.7% good, AQI 43); Champaign-Urbana, IL (65.8% good, AQI 43).
Air Quality Summary
Median AQI
43
Good
Good Days
85.2%
311 of 365 days
Max AQI
95
Moderate
Health Grade
Good
90th pct: 54
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
311
85%
Moderate
54
15%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Idaho Falls, ID metro area's air quality is rated Good based on 85.2% 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 Idaho Falls, ID metro compare?
How Idaho Falls, ID compares
5-Year Air Quality Trend
Air quality is improving in the Idaho Falls, ID metro. Highest Good-day share: 2025 (85.2%, 311 of 365 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 291 | 70 | 4 | 41 | 155 |
| 2021 | 265 | 90 | 0 | 44 | 144 |
| 2022 | 297 | 67 | 0 | 43 | 109 |
| 2023 | 306 | 59 | 0 | 44 | 84 |
| 2024 | 291 | 75 | 0 | 43 | 97 |
| 2025 | 311 | 54 | 0 | 43 | 95 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Idaho Falls, ID (43).
Ashtabula, OH
Median AQI 43 · 81.2% Good-day share
Bloomington, IN
Median AQI 43 · 67.7% Good-day share
Champaign-Urbana, IL
Median AQI 43 · 65.8% Good-day share
Cleveland, MS
Median AQI 43 · 71.9% Good-day share
Columbus, IN
Median AQI 43 · 72.6% Good-day share
Durham-Chapel Hill, NC
Median AQI 43 · 71.5% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Idaho Falls, ID's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does Idaho Falls, ID have? ▼
What is the air quality in the Idaho Falls, ID metro area? ▼
Is air quality in Idaho Falls, ID getting better or worse? ▼
What does AQI 43 mean for health? ▼
How does Idaho Falls, ID compare to other metro areas? ▼
What is the 90th percentile AQI for Idaho Falls, ID? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Idaho Falls, ID, 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, Idaho Falls, ID · 2020–2025