EnviroNearby

Anchorage, Alaska air quality history

Daily Air Quality Index summaries from EPA monitors in Anchorage, Alaska, 1980–2025.

79%
Good days in 2025
26
Median daily AQI, 2025
1
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Anchorage, Alaska on 365 days. 289 of those days (79%) were in the Good range, and the median daily AQI was 26. That median is about the same as the typical monitored county in Alaska (median 26 across 5 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 187 days. Across the years with fuller monitoring, the share of Good days rose: an average of 54% in 1980–1982 versus 83% in 2023–2025.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1980: Good 202 of 366 days1980: Moderate 117 of 366 days1980: Unhealthy for Sensitive Groups 20 of 366 days1980: Unhealthy 14 of 366 days1980: Very Unhealthy 13 of 366 days19801981: Good 207 of 365 days1981: Moderate 123 of 365 days1981: Unhealthy for Sensitive Groups 20 of 365 days1981: Unhealthy 13 of 365 days1981: Very Unhealthy 2 of 365 days1982: Good 186 of 365 days1982: Moderate 133 of 365 days1982: Unhealthy for Sensitive Groups 29 of 365 days1982: Unhealthy 15 of 365 days1982: Very Unhealthy 2 of 365 days1983: Good 178 of 365 days1983: Moderate 120 of 365 days1983: Unhealthy for Sensitive Groups 45 of 365 days1983: Unhealthy 16 of 365 days1983: Very Unhealthy 6 of 365 days1984: Good 202 of 366 days1984: Moderate 124 of 366 days1984: Unhealthy for Sensitive Groups 28 of 366 days1984: Unhealthy 4 of 366 days1984: Very Unhealthy 8 of 366 days1985: Good 228 of 365 days1985: Moderate 116 of 365 days1985: Unhealthy for Sensitive Groups 19 of 365 days1985: Unhealthy 2 of 365 days19851986: Good 199 of 365 days1986: Moderate 151 of 365 days1986: Unhealthy for Sensitive Groups 12 of 365 days1986: Unhealthy 3 of 365 days1987: Good 210 of 348 days1987: Moderate 129 of 348 days1987: Unhealthy for Sensitive Groups 9 of 348 days1988: Good 221 of 365 days1988: Moderate 132 of 365 days1988: Unhealthy for Sensitive Groups 12 of 365 days1989: Good 220 of 352 days1989: Moderate 124 of 352 days1989: Unhealthy for Sensitive Groups 7 of 352 days1989: Unhealthy 1 of 352 days1990: Good 206 of 363 days1990: Moderate 141 of 363 days1990: Unhealthy for Sensitive Groups 14 of 363 days1990: Unhealthy 2 of 363 days19901991: Good 212 of 364 days1991: Moderate 146 of 364 days1991: Unhealthy for Sensitive Groups 6 of 364 days1992: Good 175 of 364 days1992: Moderate 172 of 364 days1992: Unhealthy for Sensitive Groups 13 of 364 days1992: Unhealthy 2 of 364 days1992: Hazardous 2 of 364 days1993: Good 217 of 362 days1993: Moderate 135 of 362 days1993: Unhealthy for Sensitive Groups 10 of 362 days1994: Good 229 of 362 days1994: Moderate 125 of 362 days1994: Unhealthy for Sensitive Groups 8 of 362 days1995: Good 245 of 363 days1995: Moderate 113 of 363 days1995: Unhealthy for Sensitive Groups 5 of 363 days19951996: Good 228 of 351 days1996: Moderate 117 of 351 days1996: Unhealthy for Sensitive Groups 6 of 351 days1997: Good 266 of 360 days1997: Moderate 94 of 360 days1998: Good 266 of 361 days1998: Moderate 94 of 361 days1998: Unhealthy for Sensitive Groups 1 of 361 days1999: Good 241 of 313 days1999: Moderate 69 of 313 days1999: Unhealthy for Sensitive Groups 2 of 313 days1999: Unhealthy 1 of 313 days2000: Good 261 of 304 days2000: Moderate 43 of 304 days20002001: Good 247 of 305 days2001: Moderate 56 of 305 days2001: Unhealthy for Sensitive Groups 2 of 305 days2002: Good 240 of 303 days2002: Moderate 63 of 303 days2003: Good 267 of 310 days2003: Moderate 39 of 310 days2003: Unhealthy for Sensitive Groups 3 of 310 days2003: Hazardous 1 of 310 days2004: Good 267 of 306 days2004: Moderate 38 of 306 days2004: Unhealthy for Sensitive Groups 1 of 306 days2005: Good 257 of 302 days2005: Moderate 44 of 302 days2005: Unhealthy 1 of 302 days20052006: Good 255 of 304 days2006: Moderate 49 of 304 days2007: Good 268 of 301 days2007: Moderate 32 of 301 days2007: Unhealthy for Sensitive Groups 1 of 301 days2008: Good 276 of 306 days2008: Moderate 30 of 306 days2009: Good 254 of 362 days2009: Moderate 107 of 362 days2009: Unhealthy for Sensitive Groups 1 of 362 days2010: Good 270 of 365 days2010: Moderate 93 of 365 days2010: Unhealthy for Sensitive Groups 2 of 365 days20102011: Good 300 of 365 days2011: Moderate 65 of 365 days2012: Good 264 of 366 days2012: Moderate 102 of 366 days2013: Good 286 of 365 days2013: Moderate 78 of 365 days2013: Unhealthy 1 of 365 days2014: Good 250 of 360 days2014: Moderate 107 of 360 days2014: Unhealthy for Sensitive Groups 2 of 360 days2014: Unhealthy 1 of 360 days2015: Good 261 of 361 days2015: Moderate 100 of 361 days20152016: Good 252 of 361 days2016: Moderate 109 of 361 days2017: Good 299 of 365 days2017: Moderate 65 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2018: Good 288 of 365 days2018: Moderate 77 of 365 days2019: Good 254 of 365 days2019: Moderate 102 of 365 days2019: Unhealthy for Sensitive Groups 5 of 365 days2019: Unhealthy 4 of 365 days2020: Good 294 of 366 days2020: Moderate 72 of 366 days20202021: Good 289 of 365 days2021: Moderate 74 of 365 days2021: Unhealthy for Sensitive Groups 2 of 365 days2022: Good 302 of 365 days2022: Moderate 62 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 319 of 365 days2023: Moderate 46 of 365 days2024: Good 297 of 366 days2024: Moderate 69 of 366 days2025: Good 289 of 365 days2025: Moderate 75 of 365 days2025: Unhealthy for Sensitive Groups 1 of 365 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001501980: 90th percentile AQI 1261981: 90th percentile AQI 991982: 90th percentile AQI 1181983: 90th percentile AQI 1261984: 90th percentile AQI 1081985: 90th percentile AQI 841986: 90th percentile AQI 761987: 90th percentile AQI 741988: 90th percentile AQI 831989: 90th percentile AQI 761990: 90th percentile AQI 841991: 90th percentile AQI 811992: 90th percentile AQI 871993: 90th percentile AQI 741994: 90th percentile AQI 811995: 90th percentile AQI 741996: 90th percentile AQI 711997: 90th percentile AQI 621998: 90th percentile AQI 611999: 90th percentile AQI 612000: 90th percentile AQI 522001: 90th percentile AQI 612002: 90th percentile AQI 562003: 90th percentile AQI 532004: 90th percentile AQI 542005: 90th percentile AQI 562006: 90th percentile AQI 562007: 90th percentile AQI 512008: 90th percentile AQI 502009: 90th percentile AQI 652010: 90th percentile AQI 642011: 90th percentile AQI 562012: 90th percentile AQI 702013: 90th percentile AQI 592014: 90th percentile AQI 642015: 90th percentile AQI 602016: 90th percentile AQI 632017: 90th percentile AQI 592018: 90th percentile AQI 602019: 90th percentile AQI 672020: 90th percentile AQI 552021: 90th percentile AQI 572022: 90th percentile AQI 562023: 90th percentile AQI 532024: 90th percentile AQI 552025: 90th percentile AQI 611980: Median AQI 451981: Median AQI 451982: Median AQI 491983: Median AQI 511984: Median AQI 451985: Median AQI 381986: Median AQI 481987: Median AQI 431988: Median AQI 441989: Median AQI 401990: Median AQI 441991: Median AQI 441992: Median AQI 521993: Median AQI 431994: Median AQI 431995: Median AQI 381996: Median AQI 411997: Median AQI 381998: Median AQI 331999: Median AQI 342000: Median AQI 312001: Median AQI 312002: Median AQI 332003: Median AQI 262004: Median AQI 262005: Median AQI 252006: Median AQI 242007: Median AQI 222008: Median AQI 222009: Median AQI 372010: Median AQI 362011: Median AQI 332012: Median AQI 342013: Median AQI 312014: Median AQI 332015: Median AQI 342016: Median AQI 402017: Median AQI 282018: Median AQI 302019: Median AQI 322020: Median AQI 272021: Median AQI 282022: Median AQI 242023: Median AQI 212024: Median AQI 242025: Median AQI 261980198519901995200020052010201520202025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Fine particles (PM2.5)18751%
Coarse particles (PM10)17347%
Carbon monoxide (CO)51%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652897510002661110PM2.5
2024366297690000245590PM2.5
2023365319460000215371PM2.5
20223653026210002456125PM2.5
20213652897420002857132PM2.5
2020366294720000275592PM2.5
201936525410254003267163PM2.5
2018365288770000306087PM2.5
20173652996510002859105PM2.5
20163612521090000406391PM2.5
20153612611000000346079PM2.5
201436025010721003364153PM2.5
20133652867801003159151PM2.5
201236626410200003470100PM2.5
2011365300650000335688PM2.5
20103652709320003664127PM2.5
200936225410710003765105PM2.5
2008306276300000225086CO
20073012683210002251135CO
2006304255490000245698PM2.5
20053022574401002556151CO
20043062673810002654121CO
20033102673930012653484CO
2002303240630000335676CO
20013052475620003161113CO
2000304261430000315295CO
19993132416921003461161CO
19983612669410003361101PM10
1997360266940000386291PM10
199635122811760004171128PM10
199536324511350003874126PM10
199436222912580004381144PM10
1993362217135100004374116PM10
1992364175172132025287457PM10
199136421214660004481135PM10
1990363206141142004484159PM10
198935222012471004076176PM10
1988365221132120004483148PM10
198734821012990004374138PM10
1986365199151123004876191CO
1985365228116192003884154CO
19843662021242848045108213CO
198336517812045166051126233CO
198236518613329152049118242CO
19813652071232013204599215CO
1980366202117201413045126280CO

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Alaska with a similar median AQI in 2025

All monitored counties in Alaska

Source: U.S. EPA AirData, “Annual AQI by County” files for 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem