Grays Harbor, Washington Air Quality
Grays Harbor County, Washington (WA)
↓ Improvingover 10 years
10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days). This area has seen measurable air quality improvement over the decade.
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 23 | 43 | 80 | 339 | 26 | 0 | PM2.5 |
| 2022 | 22 | 43 | 112 | 340 | 24 | 1 | PM2.5 |
| 2021 | 26 | 42 | 82 | 347 | 18 | 0 | PM2.5 |
| 2020 | 27 | 50 | 242 | 330 | 28 | 8 | PM2.5 |
| 2019 | 27 | 47 | 62 | 327 | 25 | 0 | PM2.5 |
| 2018 | 29 | 51 | 168 | 324 | 37 | 4 | PM2.5 |
| 2017 | 27 | 53 | 162 | 313 | 49 | 3 | PM2.5 |
| 2016 | 28 | 49 | 75 | 330 | 34 | 0 | PM2.5 |
| 2015 | 29 | 51 | 68 | 303 | 40 | 0 | PM2.5 |
| 2014 | 27 | 52 | 71 | 319 | 46 | 0 | PM2.5 |
What This Means for Grays Harbor County Residents
Grays Harbor, Washington has received an Air Quality Grade of B (75/100) based on a decade of EPA monitoring data. The current median AQI of 23 falls in the "Good" range.
Encouragingly, air quality here has been improving, with the median AQI dropping by 4 points over the monitoring period. This trend suggests continued investment in emission controls and cleaner energy.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 2 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.