Anchorage Air Quality in 2021
In 2021, Anchorage's air quality (Anchorage, AK area) had a median daily AQI of 31 (Good) across 365 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 270 were Good, and the year's peak AQI was 163 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 287 of those days. The cleanest month of 2021 was June (median AQI 18, 0 days above 100) and the worst was January (median 49, 3 days above 100, peak 163).
- Good: 74.0%
- Moderate: 24.9%
- Unhealthy for Sensitive Groups: 0.8%
- Unhealthy or worse: 0.3%
Improve Indoor Air Quality
Even with good outdoor air in Anchorage, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Recommended: Levoit Core 400S — True HEPA · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How was Anchorage's air quality in 2021?
Good on a typical day: median AQI 31, with 4 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 163 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 287 days.
- ✓Cleanest month: June; worst: January.
Frequently asked questions
What was the average AQI in Anchorage in 2021?▾
EPA's Air Quality System puts Anchorage's (Anchorage, AK) median daily AQI for 2021 at 31, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 163.
Which month had the worst air quality in Anchorage in 2021?▾
The cleanest month of 2021 was June (median AQI 18, 0 days above 100) and the worst was January (median 49, 3 days above 100, peak 163).
Was 2021 a good or bad year for Anchorage's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100. 2021's median of 31 is above the area's typical annual median of 27.
Anchorage month by month in 2021
Anchorage air quality month by month, 2021 (Anchorage, AK, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januaryworst | 31 | 49 | 3 | 163 | PM2.5 |
| February | 28 | 41 | 0 | 74 | PM2.5 |
| March | 31 | 37 | 0 | 61 | PM2.5 |
| April | 30 | 47 | 0 | 86 | PM10 |
| May | 31 | 31 | 0 | 69 | PM10 |
| Junecleanest | 30 | 18 | 0 | 61 | PM2.5 |
| July | 31 | 25 | 0 | 58 | PM2.5 |
| August | 31 | 18 | 0 | 61 | PM2.5 |
| September | 30 | 21 | 1 | 107 | PM2.5 |
| October | 31 | 30 | 0 | 66 | PM2.5 |
| November | 30 | 53 | 0 | 76 | PM2.5 |
| December | 31 | 47 | 0 | 81 | PM2.5 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100.
2021's median of 31 is above the area's typical annual median of 27.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Anchorage
The latest EPA AirNow observation puts Anchorage's AQI at 49 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Anchorage air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Anchorage, AK), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.