Metro area air quality · 2025

Kalispell, MT

Median AQI 41 (Good). 73.7% of monitored days rated Good across this metro's EPA monitoring network.

41
Median AQI
73.7%
Good-air days
0
Unhealthy days
53%
Cleaner than US metros

Kalispell, MT posted a 2025 median AQI of 41 (Good) with 73.7% Good days

According to the U.S. EPA Air Quality System, the Kalispell, MT CBSA recorded a median AQI of 41 across 365 monitored days in 2025, with 73.7% 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 Kalispell, MT CBSA's 73.7% Good-day share places it cleaner than 53% of US metros in 2025.
Closest median-AQI peer
Adrian, MI (69.3% Good, median AQI 41) is the closest nationwide median-AQI peer to Kalispell, MT.
2020–2025 Good-day shift
Kalispell, MT's Good-day share moved -5.1 points from 2020 to 2025 (median AQI +4).
Median AQI
Median AQI: 41

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Kalispell, MT's Good-day share (73.7%) sits in the middle CBSA tercile on this extract. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 41 and 73.7% of 365 monitored days in the Good band.

41
median AQI · Good
73.7%
days rated Good
53%
cleaner than US metros
103
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

2024 → 2025
  • Kalispell, MT metro's Good-day share rose from 69.1% to 73.9% between the 2024 and 2025 EPA annual releases, a change of +4.8 percentage points.

Compared against 366 monitored days in 2024 and 364 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Kalispell, MT's Good-day share (73.7%) sits in the middle CBSA tercile on this extract. Signature read: 73.7% Good-day share (mid tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 41 over 365 measured days in 2025 (Good / Moderate). The monitored-day split lands at 269 Good (74%), 95 Moderate (26%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 62; the highest single-day reading hit 103 (USG).

Across 2020–2025, Good-day share shifted -5.1 points and median AQI moved +4 (worsening). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Adrian, MI (69.3% good, AQI 41); Albany-Schenectady-Troy, NY (67.7% good, AQI 41); Ann Arbor, MI (69.3% good, AQI 41).

Understanding AQI →

Air Quality Summary

Median AQI

41

Good

Good Days

73.7%

269 of 365 days

Max AQI

103

USG

Health Grade

Moderate

90th pct: 62

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

269

74%

Moderate

95

26%

USG

1

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Kalispell, MT metro area's air quality is rated Moderate based on 73.7% 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 Kalispell, MT metro compare?

How Kalispell, MT compares

Good-day share better than typical
Kalispell, MT 73.7%
Adrian, MI 69.3%
Typical US metro 70.6%
Median AQI about typical
Kalispell, MT 41
Adrian, MI 41
Typical US metro 41
Unhealthy days / yr better than typical
Kalispell, MT 0
Adrian, MI 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Kalispell, MT metro. Highest Good-day share: 2020 (79.0%, 286 of 362 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 286 72 4 37
2021 268 88 1 39
2022 249 113 1 41
2023 237 120 2 43
2024 253 113 0 42
2025 269 95 0 41

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Kalispell, MT (41).

Adrian, MI

Median AQI 41 · 69.3% Good-day share

41

Albany-Schenectady-Troy, NY

Median AQI 41 · 67.7% Good-day share

41

Ann Arbor, MI

Median AQI 41 · 69.3% Good-day share

41

Bowling Green, KY

Median AQI 41 · 75.6% Good-day share

41

Brunswick, GA

Median AQI 41 · 74.3% Good-day share

41

Decatur, AL

Median AQI 41 · 78.4% Good-day share

41

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Kalispell, MT's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Alexandria, LA

0 unhealthy-or-worse days · median AQI 37

37

Frequently Asked Questions

How many unhealthy air days does Kalispell, MT have? ▼
In 2025, the Kalispell, MT metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 103.
What is the air quality in the Kalispell, MT metro area? ▼
The Kalispell, MT metro area has a median Air Quality Index (AQI) of 41, rated "Good." 73.7% of monitored days (269 out of 365) had good air quality in 2025.
Is air quality in Kalispell, MT getting better or worse? ▼
Air quality in the Kalispell, MT metro 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: 2020 at 79.0% (286 of 362 days). Lowest qualifying Good-day share: 2023 at 66.0% (237 of 359 days).
What does AQI 41 mean for health? ▼
An AQI of 41 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How does Kalispell, MT compare to other metro areas? ▼
The Kalispell, MT metro has 73.7% good air days. Similar metros: Adrian, MI (69.3% good), Albany-Schenectady-Troy, NY (67.7% good), Ann Arbor, MI (69.3% good).
What is the 90th percentile AQI for Kalispell, MT? ▼
The 90th percentile AQI for the Kalispell, MT metro area is 62, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 103 (USG).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Kalispell, MT, 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, Kalispell, MT · 2020–2025