Metro area air quality · 2025

Othello, WA

Median AQI 21 (Good). 90.5% of monitored days rated Good across this metro's EPA monitoring network.

21
Median AQI
90.5%
Good-air days
0
Unhealthy days
87%
Cleaner than US metros

Othello, WA posted a 2025 median AQI of 21 (Good) with 90.5% Good days

According to the U.S. EPA Air Quality System, the Othello, WA CBSA recorded a median AQI of 21 across 348 monitored days in 2025, with 90.5% 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 Othello, WA CBSA's 90.5% Good-day share places it cleaner than 87% of US metros in 2025.
Closest median-AQI peer
Kahului-Wailuku-Lahaina, HI (98.1% Good, median AQI 21) is the closest nationwide median-AQI peer to Othello, WA.
2020–2025 Good-day shift
Othello, WA's Good-day share moved -5.1 points from 2020 to 2025 (median AQI +4).
Median AQI
Median AQI: 21

Aggregated from EPA Air Quality System (2025), 348 monitored days. EPA AQS →

The verdict

Othello, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (90.5% of 348 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 21 and 90.5% of 348 monitored days in the Good band.

21
median AQI · Good
90.5%
days rated Good
87%
cleaner than US metros
99
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
  • Othello, WA metro's Good-day share fell from 93.4% to 90.5% between the 2024 and 2025 EPA annual releases, a change of -2.9 percentage points.
  • Othello, WA metro's peak single-day AQI rose from 71 to 99 between the 2024 and 2025 EPA annual releases, a change of +28 points.
  • Othello, WA metro's median AQI rose from 18 to 21 between the 2024 and 2025 EPA annual releases, a change of +3 points.

Compared against 351 monitored days in 2024 and 348 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

Othello, WA sits in the upper Good-day tercile among EPA CBSA metros on this site (90.5% of 348 monitored days). Signature read: 90.5% 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 21 over 348 measured days in 2025 (Good / Excellent). The monitored-day split lands at 315 Good (91%), 33 Moderate (9%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 50; the highest single-day reading hit 99 (Moderate).

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 Kahului-Wailuku-Lahaina, HI (98.1% good, AQI 21); Palatka, FL (95.6% good, AQI 21); Aberdeen, WA (97.3% good, AQI 22).

Best and worst city air quality →

Air Quality Summary

Median AQI

21

Good

Good Days

90.5%

315 of 348 days

Max AQI

99

Moderate

Health Grade

Excellent

90th pct: 50

AQI Day Breakdown (2025)

Distribution of 348 monitored days across EPA AQI categories.

Good

315

91%

Moderate

33

9%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Othello, WA metro area's air quality is rated Excellent based on 90.5% 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 Othello, WA metro compare?

How Othello, WA compares

Good-day share better than typical
Othello, WA 90.5%
Kahului-Wailuku-Lahaina, HI 98.1%
Typical US metro 70.6%
Median AQI better than typical
Othello, WA 21
Kahului-Wailuku-Lahaina, HI 21
Typical US metro 41
Unhealthy days / yr better than typical
Othello, WA 0
Kahului-Wailuku-Lahaina, HI 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is worsening in the Othello, WA metro. Highest Good-day share: 2020 (95.6%, 345 of 361 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 345 11 5 17
2021 333 24 4 19
2022 327 34 2 18
2023 330 32 0 21
2024 328 23 0 18
2025 315 33 0 21

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Othello, WA (21).

Kahului-Wailuku-Lahaina, HI

Median AQI 21 · 98.1% Good-day share

21

Palatka, FL

Median AQI 21 · 95.6% Good-day share

21

Aberdeen, WA

Median AQI 22 · 97.3% Good-day share

22

Bremerton-Silverdale, WA

Median AQI 22 · 95.5% Good-day share

22

Centralia, WA

Median AQI 20 · 91.3% Good-day share

20

Gardnerville Ranchos, NV

Median AQI 22 · 91.1% Good-day share

22

Metros with similar unhealthy-day exposure

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

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

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

Albany-Schenectady-Troy, NY

0 unhealthy-or-worse days · median AQI 41

41

Frequently Asked Questions

How many unhealthy air days does Othello, WA have? ▼
In 2025, the Othello, WA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 99.
What is the air quality in the Othello, WA metro area? ▼
The Othello, WA metro area has a median Air Quality Index (AQI) of 21, rated "Good." 90.5% of monitored days (315 out of 348) had good air quality in 2025.
Is air quality in Othello, WA getting better or worse? ▼
Air quality in the Othello, WA 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 95.6% (345 of 361 days). Lowest qualifying Good-day share: 2022 at 90.1% (327 of 363 days).
What does AQI 21 mean for health? ▼
An AQI of 21 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 Othello, WA compare to other metro areas? ▼
The Othello, WA metro has 90.5% good air days. Similar metros: Kahului-Wailuku-Lahaina, HI (98.1% good), Palatka, FL (95.6% good), Aberdeen, WA (97.3% good).
What is the 90th percentile AQI for Othello, WA? ▼
The 90th percentile AQI for the Othello, WA metro area is 50, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 99 (Moderate).

Data Sources

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