Metro area air quality · 2025

Kalispell, MT

Median AQI 40 (Good). 82.1% of monitored days rated Good across this metro's EPA monitoring network.

40
Median AQI
82.1%
Good-air days
0
Unhealthy days
69%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 223 monitored days. EPA AQS →

The verdict

The Kalispell, MT metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 40 with 82.1% of 223 monitored days in the Good band.

40
median AQI · Good
82.1%
days rated Good
69%
cleaner than US metros
80
worst single reading

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

Insights: Kalispell, MT metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 40 over 223 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 183 Good days (82%), 40 Moderate (18%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 59 while the highest single-day reading hit 80 (Moderate). Metro residents averaged roughly 24.6 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -103 and the median AQI moved +3 points, which classifies the multi-year trajectory as improving. 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 Berlin, NH-VT (85.4% good, AQI 40); Burlington-South Burlington, VT (91.2% good, AQI 40); Cambridge, MD (84.4% good, AQI 40).

Air Quality Summary

Median AQI

40

Good

Good Days

82.1%

183 of 223 days

Max AQI

80

Moderate

Health Grade

Good

90th pct: 59

AQI Day Breakdown (2025)

Distribution of 223 monitored days across EPA AQI categories.

Good

183

82%

Moderate

40

18%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Kalispell, MT metro area's air quality is rated Good based on 82.1% 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 US avg
Kalispell, MT 82.1%
Berlin, NH-VT 85.4%
US average 71.3%
Median AQI better than US avg
Kalispell, MT 40
Berlin, NH-VT 40
US average 41
Unhealthy days / yr better than US avg
Kalispell, MT 0
Berlin, NH-VT 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Kalispell, MT metro. Best year: 2020 (286 good 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 183 40 0 40

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Kalispell, MT.

Berlin, NH-VT

AQI 40 · 85.4% good

40

Burlington-South Burlington, VT

AQI 40 · 91.2% good

40

Cambridge, MD

AQI 40 · 84.4% good

40

Charleston, WV

AQI 40 · 79.6% good

40

Corning, NY

AQI 40 · 80.2% good

40

Dickinson, ND

AQI 40 · 80.3% good

40

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 Kalispell, MT metro area? ▼
The Kalispell, MT metro area has a median Air Quality Index (AQI) of 40, rated "Good." 82.1% of monitored days (183 out of 223) had good air quality in 2025.
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 80.
Is air quality in Kalispell, MT getting better or worse? ▼
Air quality in the Kalispell, MT metro is improving based on 5-year trends (2020-2025). Best year: 2020 with 286 good days. Worst year: 2025 with 183 good days.
What does AQI 40 mean for health? ▼
An AQI of 40 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 Kalispell, MT? ▼
The 90th percentile AQI for the Kalispell, MT metro area is 59, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 80 (Moderate).
How does Kalispell, MT compare to other metro areas? ▼
The Kalispell, MT metro has 82.1% good air days. Similar metros: Berlin, NH-VT (85.4% good), Burlington-South Burlington, VT (91.2% good), Cambridge, MD (84.4% 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.