Franklin, Washington Air Quality Today
AirHistory tracks long-run EPA monitoring rather than live readings, so for the live number check AirNow.gov below. As a baseline, Franklin, Washington's most recent EPA year (2023) posted a median AQI of 26 (Good) against a 5-year median of 22 and an overall Grade of B. The dominant pollutant is Fine Particulate Matter (PM2.5), which tells you which days are most likely to spike.
Check Today's Live AQI in Franklin, Washington
AirHistory is built on 10 years of EPA Air Quality System records, so it shows you what air quality in Franklin, Washington typically looks like — not the live reading for this exact hour. For today's real-time AQI, check AirNow.gov (the EPA's official live index) or the AirNow Fire and Smoke Map during wildfire season.
That said, the history is the best predictor of a normal day. In 2023, Franklin, Washington posted a median AQI of 26 (Good), with 270 "Good" days and 5 days that crossed into "Unhealthy for Sensitive Groups" or worse. The dominant pollutant, Fine Particulate Matter (PM2.5), is the one most likely to push today's number up — Fine particulate matter — particles less than 2.5 micrometers across — comes mostly from combustion: vehicle exhaust, wildfire smoke, residential wood burning, and industrial emissions. Because these particles are small enough to enter the bloodstream, PM2.5 is the pollutant most strongly linked to cardiovascular disease, respiratory illness, and premature death.
Franklin, Washington Air Quality Snapshot
| Air Quality Grade | B73/100 |
| 5-Year Median AQI | 22 (Good) |
| Most Recent Median AQI (2023) | 26 (Good) |
| Dominant Pollutant | Fine Particulate Matter (PM2.5) |
| 10-Year Trend | Stable (-0.18 AQI/yr) |
| Unhealthy Days (last 5 yr) | 16 |
| National Rank (cleanest = #1) | #69 of 1,020 (7th cleanest percentile) |
| Washington Rank | #5 of 30 |
What Does the B Grade Mean?
Franklin, Washington earns a B — air quality is reliably in the safe range for most residents most of the time, with a 5-year median AQI of 22. Sensitive groups will see occasional caution days, but the typical resident will not need to change behavior based on air quality.
Franklin, Washington's 5-year median AQI of 22 is 19 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within Washington, Franklin, Washington runs cleaner than the state average of 31 — a positive signal that local conditions (terrain, wind patterns, emission sources) are working in residents' favor.
For context within Washington: Garfield, Washington currently holds the state's cleanest grade (A, AQI 20), while Asotin, Washington sits at the bottom (D, AQI 43).
What's in Franklin, Washington's Air?
The dominant pollutant in Franklin, Washington is Fine Particulate Matter (PM2.5). Fine particulate matter — particles less than 2.5 micrometers across — comes mostly from combustion: vehicle exhaust, wildfire smoke, residential wood burning, and industrial emissions. Because these particles are small enough to enter the bloodstream, PM2.5 is the pollutant most strongly linked to cardiovascular disease, respiratory illness, and premature death.
Days by Dominant Pollutant (2023)
| Pollutant | Days as Dominant | Share of Year |
|---|---|---|
| Fine Particulate Matter (PM2.5) | 307 | 100% |
Is the Air Getting Better or Worse?
Air quality in Franklin, Washington has held roughly steady over the past decade, with year-to-year shifts in median AQI of less than half a point. That stability makes the city's long-run grade a reliable signal of what residents can expect day-to-day.
In 2014, Franklin, Washington posted a median AQI of 25. By 2023 that figure was 26 — a rise of 1 AQI points dirtier across 10 years of EPA records.
Year-by-Year AQI in Franklin, Washington
| Year | Median AQI | Good Days | Unhealthy Days | Dominant Pollutant |
|---|---|---|---|---|
| 2014 | 25 | 272 | 0 | PM2.5 |
| 2015 | 27 | 300 | 3 | PM2.5 |
| 2016 | 18 | 318 | 0 | PM2.5 |
| 2017 | 26 | 261 | 8 | PM2.5 |
| 2018 | 23 | 300 | 7 | PM2.5 |
| 2019 | 21 | 288 | 0 | PM2.5 |
| 2020 | 18 | 313 | 8 | PM2.5 |
| 2021 | 21 | 297 | 0 | PM2.5 |
| 2022 | 23 | 269 | 3 | PM2.5 |
| 2023 | 26 | 270 | 5 | PM2.5 |
Health Context for Franklin, Washington
Across the past five years, this area has logged just 16 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 3 days per year, or roughly one every other month. That is a low count by national standards.
For most healthy adults, current air quality in this area does not require any change in behavior. People with severe asthma, COPD, or recent cardiac events should still keep an eye on daily AQI alerts, especially during wildfire season. Because PM2.5 penetrates deep into the lungs and bloodstream, an N95 or KN95 mask provides meaningful protection on smoky or high-particulate days — surgical masks do not.
How This Grade Is Calculated
The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.
More about Franklin, Washington
Franklin, Washington has an Air Quality Grade of B (good) with a 5-year median AQI of 22. The dominant pollutant is Fine Particulate Matter (PM2.5), and air quality has been stable over the past decade.
The data source behind this answer is the EPA Air Quality System (AQS). Every figure on the page traces back to that source; the methodology page describes the inputs and the refresh cadence in full detail.
For readers turning this answer into action: cross-reference against the underlying the EPA Air Quality System (AQS) record before acting on time-sensitive decisions. The site renders the data as it was published; subsequent revisions can shift the picture, and the live federal data is always the authoritative current reference.
Source: EPA Outdoor Air Quality Data, 2026.