West Clarkston-Highland, Washington Air Quality
West Clarkston-Highland has a median AQI of 35, earning an air quality grade of A — excellent air quality that ranks better than 82% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, West Clarkston-Highland recorded 177 good air quality days (74% of monitored days) and 2 unhealthy days.
Population: 5,444 • County: Asotin
Current AQI
Quick Facts
| Current AQI | 61 — Moderate |
| Air Quality Grade | A |
| Median AQI (2025) | 35 |
| vs. U.S. Cities | Better than 82% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 2 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for West Clarkston-Highland is sourced from the Clarkston-13th St monitoring area, located approximately 2 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Wildfire smoke is a significant factor in West Clarkston-Highland's air quality, with regional fires capable of pushing AQI from Good to Unhealthy within hours during fire season (typically July through October). On smoke-impacted days, staying indoors with windows closed and running an air purifier with a HEPA filter is the most effective protection.
AQI Trend (10 Years)
Air Quality Days by Year
West Clarkston-Highland Median AQI by Year
Annual EPA air quality data for West Clarkston-Highland — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 35 | 177 | 2 | 151 | PM2.5 |
| 2024 | 42 | 224 | 6 | 196 | PM2.5 |
| 2023 | 49 | 184 | 6 | 204 | PM2.5 |
| 2022 | 46 | 195 | 7 | 200 | PM2.5 |
| 2021 | 48 | 176 | 19 | 233 | PM2.5 |
| 2020 | 38 | 229 | 9 | 328 | PM2.5 |
| 2019 | 36 | 250 | 1 | 125 | PM2.5 |
| 2018 | 36 | 214 | 8 | 200 | PM2.5 |
| 2017 | 39 | 226 | 19 | 274 | PM2.5 |
| 2016 | 36 | 280 | — | 93 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About West Clarkston-Highland Air Quality
What is the air quality in West Clarkston-Highland today?
The current AQI in West Clarkston-Highland is 61, rated "Moderate". Air quality is moderate — unusually sensitive individuals may want to limit prolonged outdoor exertion. Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Is air quality in West Clarkston-Highland getting better or worse?
Air quality in West Clarkston-Highland has been stable. The median AQI has dropped 1 points (from 36 in 2016 to 35 in 2025).
What is the most common air pollutant in West Clarkston-Highland?
PM2.5 is the primary air pollutant in West Clarkston-Highland, responsible for 240 days (100% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does West Clarkston-Highland have per year?
In 2025, West Clarkston-Highland recorded 74% good air quality days (177 days) out of 240 monitored days. There were 1 Unhealthy for Sensitive Groups days and 1 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 151.
What air quality grade does West Clarkston-Highland receive?
West Clarkston-Highland receives an air quality grade of A, placing it better than 82% of US cities. This is based on a median AQI of 35 in 2025, with 177 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 82% of US cities
Nearby Cities
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National Rankings
See how West Clarkston-Highland compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for West Clarkston-Highland
West Clarkston-Highland faces elevated PM2.5 from wildfire smoke in addition to year-round traffic and industrial sources. We prioritize True HEPA units with high smoke CADR — essential for rapid air cleaning during smoke events.
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