Is the Air Quality Good in Denali, Alaska?
Yes — air quality in Denali, Alaska is good. The city earns an Air Quality Grade of B (good) on a 5-year median AQI of 34, which sits in the Good range, and logs only 0 unhealthy-air days over five years (about 0 per year). The general population can breathe outdoors safely on the vast majority of days.
Who Can Safely Breathe the Air in Denali, Alaska?
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 ozone peaks in the afternoon on hot sunny days, plan outdoor exercise for early morning or after sunset on bad-air days.
Across the past five years, this area has logged just 0 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 0 days per year, or roughly one every other month. That is a low count by national standards.
Denali, Alaska Air Quality Snapshot
| Air Quality Grade | B69/100 |
| 5-Year Median AQI | 34 (Good) |
| Most Recent Median AQI (2023) | 33 (Good) |
| Dominant Pollutant | Ground-Level Ozone |
| 10-Year Trend | Stable (+0.05 AQI/yr) |
| Unhealthy Days (last 5 yr) | 0 |
| National Rank (cleanest = #1) | #190 of 1,020 (19th cleanest percentile) |
| Alaska Rank | #7 of 8 |
What Does the B Grade Mean?
Denali, Alaska 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 34. Sensitive groups will see occasional caution days, but the typical resident will not need to change behavior based on air quality.
Denali, Alaska's 5-year median AQI of 34 is 7 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within Alaska, Denali, Alaska runs more polluted than the state average of 21 — local sources or geography are concentrating pollution above the state's typical reading.
For context within Alaska: Matanuska-Susitna, Alaska currently holds the state's cleanest grade (A, AQI 17), while Fairbanks North Star, Alaska sits at the bottom (C, AQI 42).
What's in Denali, Alaska's Air?
The dominant pollutant in Denali, Alaska is Ground-Level Ozone. Ground-level ozone forms when sunlight reacts with vehicle exhaust and industrial emissions. It is worst on hot, sunny, stagnant summer days. Ozone irritates the lungs, triggers asthma attacks, and reduces lung function — even healthy adults can feel chest tightness and shortness of breath after exercising in elevated ozone.
Days by Dominant Pollutant (2023)
| Pollutant | Days as Dominant | Share of Year |
|---|---|---|
| Ground-Level Ozone | 338 | 97% |
| Fine Particulate Matter (PM2.5) | 12 | 3% |
Is the Air Getting Better or Worse?
Air quality in Denali, Alaska 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, Denali, Alaska posted a median AQI of 31. By 2023 that figure was 33 — a rise of 2 AQI points dirtier across 10 years of EPA records.
Year-by-Year AQI in Denali, Alaska
| Year | Median AQI | Good Days | Unhealthy Days | Dominant Pollutant |
|---|---|---|---|---|
| 2014 | 31 | 333 | 0 | Ozone |
| 2015 | 35 | 355 | 0 | Ozone |
| 2016 | 33 | 357 | 0 | Ozone |
| 2017 | 34 | 359 | 0 | Ozone |
| 2018 | 35 | 361 | 0 | Ozone |
| 2019 | 36 | 355 | 0 | Ozone |
| 2020 | 33 | 356 | 0 | Ozone |
| 2021 | 33 | 360 | 0 | Ozone |
| 2022 | 34 | 328 | 0 | Ozone |
| 2023 | 33 | 350 | 0 | Ozone |
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 Denali, Alaska
Denali, Alaska has an Air Quality Grade of B (good) with a 5-year median AQI of 34. The dominant pollutant is Ground-Level Ozone, 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.