EnviroNearby

Albany County, Wyoming air quality history

Daily Air Quality Index summaries from EPA monitors in Albany, Wyoming, 1985–2025.

56%
Good days in 2025
49
Median daily AQI, 2025
12
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 Albany, Wyoming on 365 days. 203 of those days (56%) were in the Good range, and the median daily AQI was 49. That median is higher than the typical monitored county in Wyoming (median 41 across 17 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 277 days. Across the years with fuller monitoring, the share of Good days fell: an average of 74% in 1990–1992 versus 55% in 2023–2025.

Years with fewer than 120 monitored days (1985, 1986, 1987, 1989) are shown in the table but left out of comparisons and trend statements.

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%1985: Good 32 of 35 days1985: Moderate 3 of 35 days19851986: Good 40 of 45 days1986: Moderate 5 of 45 days1987: Good 24 of 27 days1987: Moderate 3 of 27 days1989: Good 45 of 47 days1989: Moderate 2 of 47 days1990: Good 268 of 354 days1990: Moderate 86 of 354 days1991: Good 226 of 321 days1991: Moderate 92 of 321 days1991: Unhealthy for Sensitive Groups 3 of 321 days19911992: Good 263 of 348 days1992: Moderate 84 of 348 days1992: Unhealthy for Sensitive Groups 1 of 348 days1993: Good 266 of 361 days1993: Moderate 95 of 361 days1994: Good 173 of 359 days1994: Moderate 182 of 359 days1994: Unhealthy for Sensitive Groups 4 of 359 days1995: Good 249 of 358 days1995: Moderate 109 of 358 days1996: Good 206 of 361 days1996: Moderate 147 of 361 days1996: Unhealthy for Sensitive Groups 8 of 361 days19961997: Good 223 of 356 days1997: Moderate 128 of 356 days1997: Unhealthy for Sensitive Groups 5 of 356 days1998: Good 209 of 360 days1998: Moderate 148 of 360 days1998: Unhealthy for Sensitive Groups 3 of 360 days1999: Good 196 of 355 days1999: Moderate 150 of 355 days1999: Unhealthy for Sensitive Groups 9 of 355 days2000: Good 185 of 357 days2000: Moderate 159 of 357 days2000: Unhealthy for Sensitive Groups 11 of 357 days2000: Unhealthy 2 of 357 days2001: Good 189 of 365 days2001: Moderate 172 of 365 days2001: Unhealthy for Sensitive Groups 4 of 365 days20012002: Good 187 of 361 days2002: Moderate 156 of 361 days2002: Unhealthy for Sensitive Groups 18 of 361 days2003: Good 155 of 360 days2003: Moderate 181 of 360 days2003: Unhealthy for Sensitive Groups 23 of 360 days2003: Unhealthy 1 of 360 days2004: Good 208 of 356 days2004: Moderate 143 of 356 days2004: Unhealthy for Sensitive Groups 5 of 356 days2005: Good 268 of 359 days2005: Moderate 91 of 359 days2006: Good 220 of 358 days2006: Moderate 135 of 358 days2006: Unhealthy for Sensitive Groups 3 of 358 days20062007: Good 214 of 357 days2007: Moderate 139 of 357 days2007: Unhealthy for Sensitive Groups 3 of 357 days2007: Unhealthy 1 of 357 days2008: Good 190 of 366 days2008: Moderate 174 of 366 days2008: Unhealthy for Sensitive Groups 2 of 366 days2009: Good 264 of 365 days2009: Moderate 100 of 365 days2009: Unhealthy 1 of 365 days2010: Good 225 of 365 days2010: Moderate 137 of 365 days2010: Unhealthy for Sensitive Groups 3 of 365 days2011: Good 230 of 365 days2011: Moderate 131 of 365 days2011: Unhealthy for Sensitive Groups 4 of 365 days20112012: Good 176 of 365 days2012: Moderate 182 of 365 days2012: Unhealthy for Sensitive Groups 7 of 365 days2013: Good 235 of 364 days2013: Moderate 126 of 364 days2013: Unhealthy for Sensitive Groups 3 of 364 days2014: Good 280 of 365 days2014: Moderate 85 of 365 days2015: Good 277 of 365 days2015: Moderate 88 of 365 days2016: Good 263 of 366 days2016: Moderate 103 of 366 days20162017: Good 219 of 365 days2017: Moderate 143 of 365 days2017: Unhealthy for Sensitive Groups 2 of 365 days2017: Unhealthy 1 of 365 days2018: Good 218 of 365 days2018: Moderate 144 of 365 days2018: Unhealthy for Sensitive Groups 3 of 365 days2019: Good 245 of 365 days2019: Moderate 120 of 365 days2020: Good 251 of 366 days2020: Moderate 106 of 366 days2020: Unhealthy for Sensitive Groups 7 of 366 days2020: Unhealthy 2 of 366 days2021: Good 193 of 365 days2021: Moderate 158 of 365 days2021: Unhealthy for Sensitive Groups 13 of 365 days2021: Hazardous 1 of 365 days20212022: Good 225 of 365 days2022: Moderate 136 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2022: Unhealthy 2 of 365 days2023: Good 212 of 365 days2023: Moderate 149 of 365 days2023: Unhealthy for Sensitive Groups 4 of 365 days2024: Good 190 of 366 days2024: Moderate 163 of 366 days2024: Unhealthy for Sensitive Groups 12 of 366 days2024: Unhealthy 1 of 366 days2025: Good 203 of 365 days2025: Moderate 150 of 365 days2025: Unhealthy for Sensitive Groups 10 of 365 days2025: Unhealthy 2 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 year0501001985: 90th percentile AQI 491986: 90th percentile AQI 511987: 90th percentile AQI 531989: 90th percentile AQI 401990: 90th percentile AQI 611991: 90th percentile AQI 711992: 90th percentile AQI 641993: 90th percentile AQI 641994: 90th percentile AQI 801995: 90th percentile AQI 671996: 90th percentile AQI 801997: 90th percentile AQI 671998: 90th percentile AQI 801999: 90th percentile AQI 772000: 90th percentile AQI 872001: 90th percentile AQI 802002: 90th percentile AQI 872003: 90th percentile AQI 972004: 90th percentile AQI 772005: 90th percentile AQI 612006: 90th percentile AQI 742007: 90th percentile AQI 742008: 90th percentile AQI 772009: 90th percentile AQI 642010: 90th percentile AQI 712011: 90th percentile AQI 712012: 90th percentile AQI 772013: 90th percentile AQI 672014: 90th percentile AQI 642015: 90th percentile AQI 612016: 90th percentile AQI 642017: 90th percentile AQI 742018: 90th percentile AQI 742019: 90th percentile AQI 612020: 90th percentile AQI 712021: 90th percentile AQI 842022: 90th percentile AQI 672023: 90th percentile AQI 712024: 90th percentile AQI 802025: 90th percentile AQI 771985: Median AQI 361986: Median AQI 261987: Median AQI 311989: Median AQI 241990: Median AQI 451991: Median AQI 461992: Median AQI 451993: Median AQI 461994: Median AQI 511995: Median AQI 471996: Median AQI 491997: Median AQI 481998: Median AQI 481999: Median AQI 502000: Median AQI 502001: Median AQI 502002: Median AQI 502003: Median AQI 542004: Median AQI 482005: Median AQI 462006: Median AQI 472007: Median AQI 482008: Median AQI 502009: Median AQI 462010: Median AQI 482011: Median AQI 472012: Median AQI 512013: Median AQI 472014: Median AQI 462015: Median AQI 462016: Median AQI 462017: Median AQI 492018: Median AQI 482019: Median AQI 472020: Median AQI 462021: Median AQI 502022: Median AQI 482023: Median AQI 482024: Median AQI 502025: Median AQI 49198519911996200120062011201620212025
  • 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
Ozone27776%
Coarse particles (PM10)8222%
Fine particles (PM2.5)62%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025365203150102004977172Ozone
2024366190163121005080187Ozone
202336521214940004871132Ozone
202236522513622004867159Ozone
2021365193158130015084312Ozone
202036625110672004671187Ozone
20193652451200000476190Ozone
201836521814430004874115Ozone
201736521914321004974154Ozone
20163662631030000466497Ozone
2015365277880000466193Ozone
2014365280850000466493Ozone
201336423512630004767122Ozone
201236517618270005177125Ozone
201136523013140004771108Ozone
201036522513730004871116Ozone
200936526410001004664152Ozone
200836619017420005077129Ozone
200735721413931004874190Ozone
200635822013530004774108Ozone
20053592689100004661100Ozone
200435620814350004877122Ozone
2003360155181231005497166Ozone
2002361187156180005087140Ozone
200136518917240005080112Ozone
2000357185159112005087172Ozone
199935519615090005077150Ozone
199836020914830004880122Ozone
199735622312850004867140Ozone
199636120614780004980115Ozone
19953582491090000476793Ozone
199435917318240005180136Ozone
1993361266950000466493Ozone
19923482638410004564105Ozone
19913212269230004671105Ozone
19903542688600004561100Ozone
1989474520000244070PM10
1987272430000315359PM10
1986454050000265158PM10
1985353230000364971PM10

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 Wyoming with a similar median AQI in 2025

All monitored counties in Wyoming

Source: U.S. EPA AirData, “Annual AQI by County” files for 1985–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem