Washington · County air quality · 2025

Pacific County, Washington

Median AQI 16 (Good). 99.7% of monitored days rated Good, direct from EPA Air Quality System stations.

16
Median AQI
99.7%
Good-air days
0
Unhealthy days
99%
Cleaner than US counties

Pacific County's 2025 annual median AQI is 16 (Good), with 99.7% Good days

According to the U.S. EPA Air Quality System, Pacific County, Washington posted a 2025 median AQI of 16 (Good) across 365 monitored days, with 99.7% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US
Pacific County's 99.7% Good-day share places it cleaner than 99% of US counties in 2025.
Closest median-AQI peer
Cook County (88.0% Good, median AQI 16) is the closest nationwide median-AQI peer to Pacific County.
2024–2025 trend
Pacific County's floor-qualifying Good-day share is stable from 2024 to 2025 (99.7% → 99.7%).
Median AQI
Median AQI: 16

According to the 2025 EPA AQS county release on PlainAirData, Pacific County, Washington ranks #21 of 951 by median AQI (16) and #8 by good-day share (99.7%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.

Data updated August 2026

Pacific County AQI category distribution Stacked-segment bar showing the share of monitored days that fell in each EPA AQI category, Good, Moderate, USG, Unhealthy, Very Unhealthy, Hazardous, with median AQI marker. AQI category distribution 365 monitored days G Median AQI 16 0 50 100 150 200 300 500 Pacific County
  • Good · 364 d · 99.7%
  • Moderate · 1 d · 0.3%

How did Pacific County's air break down in 2025?

Across 365 monitored days, 364 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 51 (Moderate).

EPA AQS →
Pacific County, Good days share 99.7%
National avg

Share of monitored days at AQI 0-50 (Good band).

Pacific County, Unhealthy-or-worse share 0.0%
National avg

Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).

Where Pacific County sits nationally

COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Pacific County's Good-day share is 99.7% - cleaner than 99% of that comparison set.

Pacific County Good-day share vs. every US county

Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release

99.7% Cleaner than 99% higher than 99% of 951 US counties

0.0%–5.0%: 0 US counties (0%). Below this entry. 5.0%–10.0%: 1 US counties (0%). Below this entry. 10.0%–15.0%: 4 US counties (0%). Below this entry. 15.0%–20.0%: 4 US counties (0%). Below this entry. 20.0%–25.0%: 1 US counties (0%). Below this entry. 25.0%–30.0%: 5 US counties (1%). Below this entry. 30.0%–35.0%: 9 US counties (1%). Below this entry. 35.0%–40.0%: 4 US counties (0%). Below this entry. 40.0%–45.0%: 16 US counties (2%). Below this entry. 45.0%–50.0%: 16 US counties (2%). Below this entry. 50.0%–55.0%: 32 US counties (3%). Below this entry. 55.0%–60.0%: 50 US counties (5%). Below this entry. 60.0%–65.0%: 77 US counties (8%). Below this entry. 65.0%–70.0%: 93 US counties (10%). Below this entry. 70.0%–75.0%: 109 US counties (11%). Below this entry. 75.0%–80.0%: 114 US counties (12%). Below this entry. 80.0%–85.0%: 123 US counties (13%). Below this entry. 85.0%–90.0%: 99 US counties (10%). Below this entry. 90.0%–95.0%: 117 US counties (12%). Below this entry. 95.0%–100.0%: 70 US counties (7%). This entry sits in this band. 100.0%–105.0%: 7 US counties (1%). Above this entry. This county 0.0% 100% every floor-qualified US county, bucketed by value

Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025

Pollutant Breakdown

Days where each pollutant was the primary driver of AQI readings in Pacific County.

Pacific County, Washington criteria pollutant distribution Stratified-band visualization showing the share of monitored days each criteria pollutant (PM2.5, PM10, O3, NO2, CO) was the primary AQI driver. PM2.5 · 100.0% 0% 25% 50% 75% 100% Pacific County, Washington · 365 monitored days Criteria pollutant column
  • PM2.5 · 365 days · 100.0%

2024 daily-monitor rhythm in Pacific County

Month-by-month median AQI from EPA day-level county monitors (330 reported days in 2024). Aug posted the highest typical readings (median AQI 21, peak 28); May was cleanest at median 13. Summer months (Jun–Aug) averaged median AQI 17 vs 14 in Dec–Feb.

0 5 10 15 20 25 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 14 13 13 13 13 14 17 21 18 16 15 14
Pacific County median daily AQI by calendar month (2024, EPA daily county file)

Health Impact Assessment

Excellent

Pacific County's air quality is rated Excellent based on 99.7% good air days. No unhealthy air days were recorded in 2025.

Air quality was acceptable on 99.7% of monitored days in 2025, with a median AQI of 16. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.

The dominant pollutant is PM2.5, driving AQI on 365 of 365 monitored days.

5-Year Air Quality Trend

Air quality is stable in Pacific County. Highest Good-day share: 2025 (99.7%, 364 of 365 monitored days).

Year Good Moderate USG Unhealthy Median AQI
2023 87 5 0 0 20
2024 329 1 0 0 16
2025 364 1 0 0 16

How does Pacific County compare?

How Pacific County compares

Good-day share better than typical
Pacific County 99.7%
Cook County, Minnesota 88.0%
Typical US county 76.0%
Median AQI better than typical
Pacific County 16
Cook County, Minnesota 16
Typical US county 39
Unhealthy days / yr better than typical
Pacific County 0
Cook County, Minnesota 8
Typical US county 1

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.

Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Pacific County, Washington · 2020–2025

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Every figure on PlainAirData 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.