EnviroNearby

Douglas County, Nevada air quality history

Daily Air Quality Index summaries from EPA monitors in Douglas, Nevada, 1981–2025.

91%
Good days in 2025
22
Median daily AQI, 2025
0
Days above 100 in 2025
358
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Douglas, Nevada on 358 days. 326 of those days (91%) were in the Good range, and the median daily AQI was 22. That median is lower than the typical monitored county in Nevada (median 42 across 9 counties), and lower than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 358 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 90% in 1981–1984 versus 88% in 2023–2025.

Years with fewer than 120 monitored days (1982, 2006, 2012) 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%1981: Good 228 of 266 days1981: Moderate 38 of 266 days19811982: Good 88 of 88 days1983: Good 243 of 247 days1983: Moderate 1 of 247 days1983: Unhealthy 3 of 247 days1984: Good 184 of 214 days1984: Moderate 30 of 214 days1985: Good 300 of 343 days1985: Moderate 41 of 343 days1985: Unhealthy for Sensitive Groups 2 of 343 days1986: Good 289 of 359 days1986: Moderate 50 of 359 days1986: Unhealthy for Sensitive Groups 19 of 359 days1986: Unhealthy 1 of 359 days19861987: Good 211 of 352 days1987: Moderate 125 of 352 days1987: Unhealthy for Sensitive Groups 16 of 352 days1988: Good 244 of 364 days1988: Moderate 84 of 364 days1988: Unhealthy for Sensitive Groups 32 of 364 days1988: Unhealthy 4 of 364 days1989: Good 312 of 354 days1989: Moderate 41 of 354 days1989: Unhealthy for Sensitive Groups 1 of 354 days1990: Good 216 of 263 days1990: Moderate 39 of 263 days1990: Unhealthy for Sensitive Groups 8 of 263 days1991: Good 219 of 359 days1991: Moderate 123 of 359 days1991: Unhealthy for Sensitive Groups 17 of 359 days19911992: Good 291 of 366 days1992: Moderate 73 of 366 days1992: Unhealthy for Sensitive Groups 2 of 366 days1993: Good 316 of 360 days1993: Moderate 44 of 360 days1994: Good 264 of 365 days1994: Moderate 99 of 365 days1994: Unhealthy for Sensitive Groups 2 of 365 days1995: Good 304 of 361 days1995: Moderate 55 of 361 days1995: Unhealthy for Sensitive Groups 2 of 361 days1996: Good 264 of 354 days1996: Moderate 86 of 354 days1996: Unhealthy for Sensitive Groups 4 of 354 days19961997: Good 281 of 364 days1997: Moderate 78 of 364 days1997: Unhealthy for Sensitive Groups 5 of 364 days1998: Good 302 of 365 days1998: Moderate 61 of 365 days1998: Unhealthy for Sensitive Groups 2 of 365 days1999: Good 243 of 350 days1999: Moderate 102 of 350 days1999: Unhealthy for Sensitive Groups 5 of 350 days2000: Good 252 of 366 days2000: Moderate 109 of 366 days2000: Unhealthy for Sensitive Groups 5 of 366 days2001: Good 253 of 365 days2001: Moderate 103 of 365 days2001: Unhealthy for Sensitive Groups 9 of 365 days20012002: Good 239 of 365 days2002: Moderate 117 of 365 days2002: Unhealthy for Sensitive Groups 9 of 365 days2003: Good 268 of 365 days2003: Moderate 97 of 365 days2004: Good 352 of 354 days2004: Moderate 2 of 354 days2005: Good 307 of 307 days2006: Good 49 of 49 days20062007: Good 348 of 349 days2007: Moderate 1 of 349 days2008: Good 291 of 291 days2009: Good 337 of 337 days2010: Good 339 of 339 days2011: Good 337 of 341 days2011: Moderate 4 of 341 days20112012: Good 100 of 115 days2012: Moderate 15 of 115 days2013: Good 170 of 277 days2013: Moderate 87 of 277 days2013: Unhealthy for Sensitive Groups 5 of 277 days2013: Unhealthy 8 of 277 days2013: Very Unhealthy 6 of 277 days2013: Hazardous 1 of 277 days2014: Good 255 of 364 days2014: Moderate 105 of 364 days2014: Unhealthy for Sensitive Groups 4 of 364 days2015: Good 209 of 314 days2015: Moderate 98 of 314 days2015: Unhealthy for Sensitive Groups 5 of 314 days2015: Unhealthy 2 of 314 days2016: Good 268 of 336 days2016: Moderate 67 of 336 days2016: Unhealthy for Sensitive Groups 1 of 336 days20162017: Good 273 of 338 days2017: Moderate 61 of 338 days2017: Unhealthy for Sensitive Groups 3 of 338 days2017: Very Unhealthy 1 of 338 days2018: Good 291 of 362 days2018: Moderate 61 of 362 days2018: Unhealthy for Sensitive Groups 6 of 362 days2018: Unhealthy 2 of 362 days2018: Very Unhealthy 2 of 362 days2019: Good 318 of 356 days2019: Moderate 38 of 356 days2020: Good 286 of 366 days2020: Moderate 63 of 366 days2020: Unhealthy for Sensitive Groups 6 of 366 days2020: Unhealthy 7 of 366 days2020: Very Unhealthy 4 of 366 days2021: Good 279 of 365 days2021: Moderate 53 of 365 days2021: Unhealthy for Sensitive Groups 7 of 365 days2021: Unhealthy 20 of 365 days2021: Very Unhealthy 6 of 365 days20212022: Good 295 of 356 days2022: Moderate 55 of 356 days2022: Unhealthy for Sensitive Groups 1 of 356 days2022: Unhealthy 5 of 356 days2023: Good 296 of 359 days2023: Moderate 63 of 359 days2024: Good 308 of 342 days2024: Moderate 34 of 342 days2025: Good 326 of 358 days2025: Moderate 32 of 358 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 year0501001981: 90th percentile AQI 541982: 90th percentile AQI 401983: 90th percentile AQI 361984: 90th percentile AQI 541985: 90th percentile AQI 531986: 90th percentile AQI 801987: 90th percentile AQI 871988: 90th percentile AQI 1001989: 90th percentile AQI 541990: 90th percentile AQI 711991: 90th percentile AQI 841992: 90th percentile AQI 671993: 90th percentile AQI 541994: 90th percentile AQI 671995: 90th percentile AQI 611996: 90th percentile AQI 671997: 90th percentile AQI 671998: 90th percentile AQI 641999: 90th percentile AQI 742000: 90th percentile AQI 772001: 90th percentile AQI 742002: 90th percentile AQI 842003: 90th percentile AQI 662004: 90th percentile AQI 442005: 90th percentile AQI 252006: 90th percentile AQI 252007: 90th percentile AQI 202008: 90th percentile AQI 192009: 90th percentile AQI 162010: 90th percentile AQI 162011: 90th percentile AQI 172012: 90th percentile AQI 552013: 90th percentile AQI 872014: 90th percentile AQI 662015: 90th percentile AQI 692016: 90th percentile AQI 582017: 90th percentile AQI 592018: 90th percentile AQI 602019: 90th percentile AQI 522020: 90th percentile AQI 642021: 90th percentile AQI 912022: 90th percentile AQI 572023: 90th percentile AQI 562024: 90th percentile AQI 502025: 90th percentile AQI 501981: Median AQI 391982: Median AQI 331983: Median AQI 221984: Median AQI 401985: Median AQI 361986: Median AQI 401987: Median AQI 451988: Median AQI 441989: Median AQI 341990: Median AQI 391991: Median AQI 471992: Median AQI 411993: Median AQI 411994: Median AQI 441995: Median AQI 421996: Median AQI 441997: Median AQI 441998: Median AQI 431999: Median AQI 452000: Median AQI 452001: Median AQI 452002: Median AQI 462003: Median AQI 442004: Median AQI 222005: Median AQI 152006: Median AQI 142007: Median AQI 102008: Median AQI 112009: Median AQI 92010: Median AQI 82011: Median AQI 102012: Median AQI 142013: Median AQI 432014: Median AQI 372015: Median AQI 412016: Median AQI 342017: Median AQI 262018: Median AQI 212019: Median AQI 172020: Median AQI 222021: Median AQI 242022: Median AQI 202023: Median AQI 282024: Median AQI 222025: Median AQI 221981198619911996200120062011201620212025
  • 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)358100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025358326320000225063PM2.5
2024342308340000225076PM2.5
2023359296630000285673PM2.5
20223562955515002057195PM2.5
202136527953720602491279PM2.5
20203662866367402264274PM2.5
2019356318380000175266PM2.5
20183622916162202160229PM2.5
20173382736130102659212PM2.5
20163362686710003458105PM2.5
20153142099852004169178PM2.5
201436425510540003766135PM2.5
20132771708758614387310PM2.5
2012115100150000145577CO
201134133740000101766CO
20103393390000081636CO
20093373370000091639CO
200829129100000111930CO
200734934810000102051CO
2006494900000142535CO
200530730700000152543CO
200435435220000224474CO
2003365268970000446687Ozone
200236523911790004684140Ozone
200136525310390004574126Ozone
200036625210950004577140Ozone
199935024310250004574133Ozone
19983653026120004364101Ozone
19973642817850004467115Ozone
19963542648640004467119Ozone
19953613045520004261140Ozone
19943652649920004467119Ozone
1993360316440000415490Ozone
19923662917320004167108Ozone
1991359219123170004784143Ozone
19902632163980003971126Ozone
19893543124110003454101Ozone
1988364244843240044100182Ozone
1987352211125160004587140Ozone
198635928950191004080151Ozone
19853433004120003653122Ozone
1984214184300000405497Ozone
1983247243103002236177CO
1982888800000334050CO
19812662283800003954100CO

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 Nevada with a similar median AQI in 2025

All monitored counties in Nevada

Source: U.S. EPA AirData, “Annual AQI by County” files for 1981–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem