Metro area air quality · 2024

Klamath Falls, OR

Median AQI 33 (Good). 70.8% of monitored days rated Good across this metro's EPA monitoring network.

33
Median AQI
70.8%
Good-air days
7
Unhealthy days
45%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 366 monitored days. EPA AQS → · NOAA →

Insights: Klamath Falls, OR metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 33 over 366 measured days in 2024, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 259 Good days (71%), 91 Moderate (25%), and 9 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 76 while the highest single-day reading hit 207 (Very Unhealthy). Metro residents averaged roughly 21.2 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +87 and the median AQI moved -19 points, which classifies the multi-year trajectory as improving. The metro recorded 7 unhealthy-or-worse days combined, on those days the EPA recommends that sensitive groups limit prolonged outdoor exertion, and many schools and athletic programs adjust outdoor activity accordingly. Metros with comparable AQI profiles include Bangor, ME (90.6% good, AQI 33); Bellingham, WA (92.8% good, AQI 33); Fairmont, WV (76.6% good, AQI 33).

Air Quality Summary

Median AQI

33

Good

Good Days

70.8%

259 of 366 days

Max AQI

207

Very Unhealthy

Health Grade

Moderate

90th pct: 76

AQI Day Breakdown (2024)

Distribution of 366 monitored days across EPA AQI categories.

Good

259

71%

Moderate

91

25%

USG

9

2%

Unhealthy

6

2%

Very Unhealthy

1

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Klamath Falls, OR metro area's air quality is rated Moderate based on 70.8% good air days. There were 7 unhealthy days in 2024 when outdoor activity should be limited.

Air quality reached unhealthy levels on 7 days in 2024 (6 Unhealthy, 1 Very Unhealthy). Sensitive groups, including people with asthma, COPD, cardiovascular conditions, children, and adults over 65, should review the daily breakdown and follow local advisories.

Sensitive group advisory

People with asthma, COPD, heart disease, children, pregnant women, and adults 65+ should follow EPA AQI alerts daily and limit outdoor exertion when AQI exceeds 100. Real-time conditions: airnow.gov.

How does the Klamath Falls, OR metro compare?

How Klamath Falls, OR compares

Good-day share better than US avg
Klamath Falls, OR 70.8%
Bangor, ME 90.6%
US average 70.2%
Median AQI better than US avg
Klamath Falls, OR 33
Bangor, ME 33
US average 41
Unhealthy days / yr worse than US avg
Klamath Falls, OR 7
Bangor, ME 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Klamath Falls, OR metro. Best year: 2024 (259 good days).

Year Good Moderate Unhealthy Median AQI
2020 172 148 20 52
2021 162 153 25 54
2022 222 139 2 38
2023 216 137 5 39
2024 259 91 6 33

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Klamath Falls, OR.

Bangor, ME

AQI 33 · 90.6% good

33

Bellingham, WA

AQI 33 · 92.8% good

33

Fairmont, WV

AQI 33 · 76.6% good

33

Jackson, TN

AQI 33 · 81.0% good

33

Rockland, ME

AQI 33 · 96.6% good

33

Athens, TN

AQI 32 · 78.9% good

32

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Health Effects of Air Pollution

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Frequently Asked Questions

What is the air quality in the Klamath Falls, OR metro area? ▼
The Klamath Falls, OR metro area has a median Air Quality Index (AQI) of 33, rated "Good." 70.8% of monitored days (259 out of 366) had good air quality in 2024.
How many unhealthy air days does Klamath Falls, OR have? ▼
In 2024, the Klamath Falls, OR metro area recorded 7 unhealthy air days (6 Unhealthy, 1 Very Unhealthy, 0 Hazardous). The maximum AQI reached 207.
Is air quality in Klamath Falls, OR getting better or worse? ▼
Air quality in the Klamath Falls, OR metro is improving based on 5-year trends (2020-2024). Best year: 2024 with 259 good days. Worst year: 2021 with 162 good days.
What does AQI 33 mean for health? ▼
An AQI of 33 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 Klamath Falls, OR? ▼
The 90th percentile AQI for the Klamath Falls, OR metro area is 76, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 207 (Very Unhealthy).
How does Klamath Falls, OR compare to other metro areas? ▼
The Klamath Falls, OR metro has 70.8% good air days. Similar metros: Bangor, ME (90.6% good), Bellingham, WA (92.8% good), Fairmont, WV (76.6% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

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

Source: U.S. EPA, AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025