EnviroNearby

Fairbanks North Star, Alaska air quality history

Daily Air Quality Index summaries from EPA monitors in Fairbanks North Star, Alaska, 1980–2025.

56%
Good days in 2025
44
Median daily AQI, 2025
20
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 Fairbanks North Star, Alaska on 365 days. 206 of those days (56%) were in the Good range, and the median daily AQI was 44. That median is higher than the typical monitored county in Alaska (median 26 across 5 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 276 days. Across the years with fuller monitoring, the share of Good days fell: an average of 68% in 1980–1982 versus 59% 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 243 of 365 days1980: Moderate 84 of 365 days1980: Unhealthy for Sensitive Groups 25 of 365 days1980: Unhealthy 10 of 365 days1980: Very Unhealthy 3 of 365 days19801981: Good 228 of 334 days1981: Moderate 82 of 334 days1981: Unhealthy for Sensitive Groups 17 of 334 days1981: Unhealthy 6 of 334 days1981: Very Unhealthy 1 of 334 days1982: Good 251 of 365 days1982: Moderate 73 of 365 days1982: Unhealthy for Sensitive Groups 26 of 365 days1982: Unhealthy 11 of 365 days1982: Very Unhealthy 4 of 365 days1983: Good 162 of 274 days1983: Moderate 76 of 274 days1983: Unhealthy for Sensitive Groups 25 of 274 days1983: Unhealthy 7 of 274 days1983: Very Unhealthy 4 of 274 days1984: Good 105 of 184 days1984: Moderate 71 of 184 days1984: Unhealthy for Sensitive Groups 7 of 184 days1984: Unhealthy 1 of 184 days1985: Good 68 of 183 days1985: Moderate 82 of 183 days1985: Unhealthy for Sensitive Groups 21 of 183 days1985: Unhealthy 9 of 183 days1985: Very Unhealthy 3 of 183 days19851986: Good 144 of 270 days1986: Moderate 94 of 270 days1986: Unhealthy for Sensitive Groups 25 of 270 days1986: Unhealthy 6 of 270 days1986: Very Unhealthy 1 of 270 days1987: Good 188 of 272 days1987: Moderate 66 of 272 days1987: Unhealthy for Sensitive Groups 15 of 272 days1987: Unhealthy 3 of 272 days1988: Good 181 of 270 days1988: Moderate 73 of 270 days1988: Unhealthy for Sensitive Groups 11 of 270 days1988: Unhealthy 5 of 270 days1989: Good 199 of 269 days1989: Moderate 64 of 269 days1989: Unhealthy for Sensitive Groups 5 of 269 days1989: Unhealthy 1 of 269 days1990: Good 198 of 273 days1990: Moderate 72 of 273 days1990: Unhealthy for Sensitive Groups 3 of 273 days19901991: Good 203 of 271 days1991: Moderate 62 of 271 days1991: Unhealthy for Sensitive Groups 6 of 271 days1992: Good 201 of 265 days1992: Moderate 60 of 265 days1992: Unhealthy for Sensitive Groups 4 of 265 days1993: Good 190 of 270 days1993: Moderate 74 of 270 days1993: Unhealthy for Sensitive Groups 6 of 270 days1994: Good 201 of 269 days1994: Moderate 64 of 269 days1994: Unhealthy for Sensitive Groups 3 of 269 days1994: Unhealthy 1 of 269 days1995: Good 190 of 260 days1995: Moderate 59 of 260 days1995: Unhealthy for Sensitive Groups 10 of 260 days1995: Unhealthy 1 of 260 days19951996: Good 214 of 268 days1996: Moderate 53 of 268 days1996: Unhealthy for Sensitive Groups 1 of 268 days1997: Good 214 of 273 days1997: Moderate 55 of 273 days1997: Unhealthy for Sensitive Groups 3 of 273 days1997: Unhealthy 1 of 273 days1998: Good 162 of 208 days1998: Moderate 44 of 208 days1998: Unhealthy for Sensitive Groups 2 of 208 days1999: Good 182 of 238 days1999: Moderate 52 of 238 days1999: Unhealthy for Sensitive Groups 4 of 238 days2000: Good 162 of 243 days2000: Moderate 70 of 243 days2000: Unhealthy for Sensitive Groups 8 of 243 days2000: Unhealthy 3 of 243 days20002001: Good 163 of 243 days2001: Moderate 74 of 243 days2001: Unhealthy for Sensitive Groups 6 of 243 days2002: Good 165 of 238 days2002: Moderate 68 of 238 days2002: Unhealthy for Sensitive Groups 4 of 238 days2002: Unhealthy 1 of 238 days2003: Good 187 of 229 days2003: Moderate 42 of 229 days2004: Good 176 of 225 days2004: Moderate 31 of 225 days2004: Unhealthy for Sensitive Groups 5 of 225 days2004: Unhealthy 3 of 225 days2004: Very Unhealthy 4 of 225 days2004: Hazardous 6 of 225 days2005: Good 181 of 225 days2005: Moderate 41 of 225 days2005: Unhealthy for Sensitive Groups 2 of 225 days2005: Unhealthy 1 of 225 days20052006: Good 189 of 338 days2006: Moderate 128 of 338 days2006: Unhealthy for Sensitive Groups 19 of 338 days2006: Unhealthy 2 of 338 days2007: Good 182 of 332 days2007: Moderate 136 of 332 days2007: Unhealthy for Sensitive Groups 12 of 332 days2007: Unhealthy 2 of 332 days2008: Good 235 of 363 days2008: Moderate 99 of 363 days2008: Unhealthy for Sensitive Groups 22 of 363 days2008: Unhealthy 7 of 363 days2009: Good 189 of 362 days2009: Moderate 126 of 362 days2009: Unhealthy for Sensitive Groups 28 of 362 days2009: Unhealthy 13 of 362 days2009: Very Unhealthy 5 of 362 days2009: Hazardous 1 of 362 days2010: Good 180 of 355 days2010: Moderate 140 of 355 days2010: Unhealthy for Sensitive Groups 27 of 355 days2010: Unhealthy 8 of 355 days20102011: Good 184 of 365 days2011: Moderate 149 of 365 days2011: Unhealthy for Sensitive Groups 27 of 365 days2011: Unhealthy 5 of 365 days2012: Good 214 of 366 days2012: Moderate 110 of 366 days2012: Unhealthy for Sensitive Groups 15 of 366 days2012: Unhealthy 24 of 366 days2012: Very Unhealthy 3 of 366 days2013: Good 159 of 365 days2013: Moderate 147 of 365 days2013: Unhealthy for Sensitive Groups 31 of 365 days2013: Unhealthy 27 of 365 days2013: Very Unhealthy 1 of 365 days2014: Good 154 of 365 days2014: Moderate 130 of 365 days2014: Unhealthy for Sensitive Groups 34 of 365 days2014: Unhealthy 42 of 365 days2014: Very Unhealthy 5 of 365 days2015: Good 124 of 365 days2015: Moderate 178 of 365 days2015: Unhealthy for Sensitive Groups 20 of 365 days2015: Unhealthy 37 of 365 days2015: Very Unhealthy 6 of 365 days20152016: Good 197 of 366 days2016: Moderate 113 of 366 days2016: Unhealthy for Sensitive Groups 33 of 366 days2016: Unhealthy 23 of 366 days2017: Good 212 of 365 days2017: Moderate 108 of 365 days2017: Unhealthy for Sensitive Groups 25 of 365 days2017: Unhealthy 20 of 365 days2018: Good 215 of 365 days2018: Moderate 111 of 365 days2018: Unhealthy for Sensitive Groups 29 of 365 days2018: Unhealthy 10 of 365 days2019: Good 205 of 365 days2019: Moderate 121 of 365 days2019: Unhealthy for Sensitive Groups 18 of 365 days2019: Unhealthy 16 of 365 days2019: Very Unhealthy 1 of 365 days2019: Hazardous 4 of 365 days2020: Good 231 of 366 days2020: Moderate 98 of 366 days2020: Unhealthy for Sensitive Groups 17 of 366 days2020: Unhealthy 20 of 366 days20202021: Good 211 of 365 days2021: Moderate 120 of 365 days2021: Unhealthy for Sensitive Groups 21 of 365 days2021: Unhealthy 13 of 365 days2022: Good 213 of 365 days2022: Moderate 105 of 365 days2022: Unhealthy for Sensitive Groups 18 of 365 days2022: Unhealthy 27 of 365 days2022: Very Unhealthy 1 of 365 days2022: Hazardous 1 of 365 days2023: Good 224 of 365 days2023: Moderate 109 of 365 days2023: Unhealthy for Sensitive Groups 21 of 365 days2023: Unhealthy 10 of 365 days2023: Very Unhealthy 1 of 365 days2024: Good 213 of 366 days2024: Moderate 128 of 366 days2024: Unhealthy for Sensitive Groups 15 of 366 days2024: Unhealthy 8 of 366 days2024: Very Unhealthy 1 of 366 days2024: Hazardous 1 of 366 days2025: Good 206 of 365 days2025: Moderate 139 of 365 days2025: Unhealthy for Sensitive Groups 10 of 365 days2025: Unhealthy 10 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 year0501001502001980: 90th percentile AQI 1031981: 90th percentile AQI 921982: 90th percentile AQI 1081983: 90th percentile AQI 1151984: 90th percentile AQI 841985: 90th percentile AQI 1361986: 90th percentile AQI 1111987: 90th percentile AQI 881988: 90th percentile AQI 831989: 90th percentile AQI 811990: 90th percentile AQI 701991: 90th percentile AQI 681992: 90th percentile AQI 701993: 90th percentile AQI 761994: 90th percentile AQI 691995: 90th percentile AQI 831996: 90th percentile AQI 671997: 90th percentile AQI 641998: 90th percentile AQI 701999: 90th percentile AQI 672000: 90th percentile AQI 832001: 90th percentile AQI 802002: 90th percentile AQI 712003: 90th percentile AQI 592004: 90th percentile AQI 842005: 90th percentile AQI 732006: 90th percentile AQI 902007: 90th percentile AQI 822008: 90th percentile AQI 922009: 90th percentile AQI 1132010: 90th percentile AQI 992011: 90th percentile AQI 962012: 90th percentile AQI 1152013: 90th percentile AQI 1332014: 90th percentile AQI 1582015: 90th percentile AQI 1542016: 90th percentile AQI 1212017: 90th percentile AQI 1152018: 90th percentile AQI 1032019: 90th percentile AQI 1032020: 90th percentile AQI 1062021: 90th percentile AQI 972022: 90th percentile AQI 1182023: 90th percentile AQI 932024: 90th percentile AQI 892025: 90th percentile AQI 851980: Median AQI 331981: Median AQI 281982: Median AQI 241983: Median AQI 381984: Median AQI 451985: Median AQI 621986: Median AQI 471987: Median AQI 341988: Median AQI 361989: Median AQI 331990: Median AQI 361991: Median AQI 331992: Median AQI 331993: Median AQI 351994: Median AQI 321995: Median AQI 331996: Median AQI 301997: Median AQI 281998: Median AQI 341999: Median AQI 322000: Median AQI 342001: Median AQI 362002: Median AQI 342003: Median AQI 252004: Median AQI 252005: Median AQI 272006: Median AQI 432007: Median AQI 432008: Median AQI 302009: Median AQI 462010: Median AQI 482011: Median AQI 492012: Median AQI 432013: Median AQI 532014: Median AQI 572015: Median AQI 592016: Median AQI 462017: Median AQI 442018: Median AQI 402019: Median AQI 442020: Median AQI 392021: Median AQI 422022: Median AQI 432023: Median AQI 412024: Median AQI 422025: Median AQI 441980198519901995200020052010201520202025
  • 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)27676%
Ozone8924%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652061391010004485190PM2.5
2024366213128158114289325PM2.5
20233652241092110104193231PM2.5
202236521310518271143118310PM2.5
20213652111202113004297189PM2.5
20203662319817200039106177PM2.5
201936520512118161444103503PM2.5
201836521511129100040103158PM2.5
201736521210825200044115190PM2.5
201636619711333230046121190PM2.5
201536512417820376059154263PM2.5
201436515413034425057158231PM2.5
201336515914731271053133213PM2.5
201236621411015243043115246PM2.5
2011365184149275004996165PM2.5
2010355180140278004899180PM2.5
200936218912628135146113410PM2.5
200836323599227003092197PM2.5
2007332182136122004382163PM2.5
2006338189128192004390158PM2.5
20052251814121002773154CO
20042251763153462584859CO
20032291874200002559100CO
20022381656841003471171CO
20012431637460003680133PM2.5
20002431627083003483176CO
19992381825240003267130CO
19982081624420003470128CO
19972732145531002864165CO
19962682145310003067106CO
199526019059101003383197CO
19942692016431003269168CO
19932701907460003576143CO
19922652016040003370115CO
19912712036260003368118CO
19902731987230003670140CO
19892691996451003381158CO
198827018173115003683200CO
198727218866153003488193CO
1986270144942561047111205CO
198518368822193062136220CO
19841841057171004584154CO
1983274162762574038115224CO
19823652517326114024108216CO
198133422882176102892202CO
19803652438425103033103210CO

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