Metro area air quality · 2025

Havre, MT

Median AQI 14 (Good). 92.1% of monitored days rated Good across this metro's EPA monitoring network.

14
Median AQI
92.1%
Good-air days
1
Unhealthy days
90%
Cleaner than US metros

Havre, MT posted a 2025 median AQI of 14 (Good) with 92.1% Good days

According to the U.S. EPA Air Quality System, the Havre, MT CBSA recorded a median AQI of 14 across 304 monitored days in 2025, with 92.1% rated Good and 1 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 Havre, MT CBSA's 92.1% Good-day share places it cleaner than 90% of US metros in 2025.
Closest median-AQI peer
Show Low, AZ (99.5% Good, median AQI 13) is the closest nationwide median-AQI peer to Havre, MT.
2023–2025 Good-day shift
Havre, MT's Good-day share moved +11.8 points from 2023 to 2025 (median AQI -9).
Median AQI
Median AQI: 14

Aggregated from EPA Air Quality System (2025), 304 monitored days. EPA AQS →

The verdict

Havre, MT sits in the upper Good-day tercile among EPA CBSA metros on this site (92.1% of 304 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 14 and 92.1% of 304 monitored days in the Good band.

14
median AQI · Good
92.1%
days rated Good
90%
cleaner than US metros
157
worst single reading

1 day reached Unhealthy or worse across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Havre, MT metro's peak single-day AQI rose from 123 to 157 between the 2024 and 2025 EPA annual releases, a change of +34 points.
  • Havre, MT metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.

Compared against 337 monitored days in 2024 and 303 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

Havre, MT sits in the upper Good-day tercile among EPA CBSA metros on this site (92.1% of 304 monitored days). Signature read: 92.1% 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 14 over 304 measured days in 2025 (Good / Excellent). The monitored-day split lands at 280 Good (92%), 22 Moderate (7%), and 1 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 40; the highest single-day reading hit 157 (Unhealthy).

Across 2023–2025, Good-day share shifted +11.8 points and median AQI moved -9 (improving). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Show Low, AZ (99.5% good, AQI 13); Taos, NM (98.9% good, AQI 16); Bozeman, MT (98.1% good, AQI 11).

Health effects of air pollution →

Air Quality Summary

Median AQI

14

Good

Good Days

92.1%

280 of 304 days

Max AQI

157

Unhealthy

Health Grade

Excellent

90th pct: 40

AQI Day Breakdown (2025)

Distribution of 304 monitored days across EPA AQI categories.

Good

280

92%

Moderate

22

7%

USG

1

0%

Unhealthy

1

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Havre, MT metro area's air quality is rated Excellent based on 92.1% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 1 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 157. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Havre, MT metro compare?

How Havre, MT compares

Good-day share better than typical
Havre, MT 92.1%
Show Low, AZ 99.5%
Typical US metro 70.6%
Median AQI better than typical
Havre, MT 14
Show Low, AZ 13
Typical US metro 41
Unhealthy days / yr about typical
Havre, MT 1
Show Low, AZ 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Havre, MT metro. Highest Good-day share: 2024 (93.2%, 314 of 337 monitored days).

Year Good Moderate Unhealthy Median AQI
2023 170 38 3 23
2024 314 23 0 15
2025 280 22 1 14

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Havre, MT (14).

Show Low, AZ

Median AQI 13 · 99.5% Good-day share

13

Taos, NM

Median AQI 16 · 98.9% Good-day share

16

Bozeman, MT

Median AQI 11 · 98.1% Good-day share

11

Deming, NM

Median AQI 17 · 84.7% Good-day share

17

Hailey, ID

Median AQI 17 · 96.6% Good-day share

17

Lake Havasu City-Kingman, AZ

Median AQI 17 · 94.8% Good-day share

17

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Havre, MT's 1 (independent of median AQI).

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

40

Frequently Asked Questions

How many unhealthy air days does Havre, MT have? ▼
In 2025, the Havre, MT metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 157.
What is the air quality in the Havre, MT metro area? ▼
The Havre, MT metro area has a median Air Quality Index (AQI) of 14, rated "Good." 92.1% of monitored days (280 out of 304) had good air quality in 2025.
Is air quality in Havre, MT getting better or worse? ▼
Air quality in the Havre, MT metro is improving across floor-qualifying years (2023-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 93.2% (314 of 337 days). Lowest qualifying Good-day share: 2023 at 80.6% (170 of 211 days).
What does AQI 14 mean for health? ▼
An AQI of 14 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 Havre, MT compare to other metro areas? ▼
The Havre, MT metro has 92.1% good air days. Similar metros: Show Low, AZ (99.5% good), Taos, NM (98.9% good), Bozeman, MT (98.1% good).
What is the 90th percentile AQI for Havre, MT? ▼
The 90th percentile AQI for the Havre, MT metro area is 40, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 157 (Unhealthy).

Data Sources

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