EnviroNearby

Carson City, Nevada air quality history

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

86%
Good days in 2025
42
Median daily AQI, 2025
0
Days above 100 in 2025
363
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Carson City, Nevada on 363 days. 313 of those days (86%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in Nevada (median 42 across 9 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 268 days. Across the years with fuller monitoring, the share of Good days fell: an average of 83% in 1981–1984 versus 75% in 2023–2025.

Years with fewer than 120 monitored days (1992, 1993, 1994, 1995, 1996, 2009…) 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 233 of 244 days1981: Moderate 11 of 244 days19811982: Good 64 of 69 days1982: Moderate 5 of 69 days1983: Good 358 of 358 days1984: Good 169 of 314 days1984: Moderate 105 of 314 days1984: Unhealthy for Sensitive Groups 34 of 314 days1984: Unhealthy 6 of 314 days1985: Good 155 of 357 days1985: Moderate 110 of 357 days1985: Unhealthy for Sensitive Groups 79 of 357 days1985: Unhealthy 12 of 357 days1985: Very Unhealthy 1 of 357 days1986: Good 212 of 328 days1986: Moderate 76 of 328 days1986: Unhealthy for Sensitive Groups 37 of 328 days1986: Unhealthy 3 of 328 days19861987: Good 335 of 335 days1988: Good 227 of 286 days1988: Moderate 51 of 286 days1988: Unhealthy for Sensitive Groups 8 of 286 days1989: Good 241 of 267 days1989: Moderate 24 of 267 days1989: Unhealthy for Sensitive Groups 2 of 267 days1991: Good 37 of 37 days1992: Good 55 of 56 days1992: Moderate 1 of 56 days19921993: Good 54 of 55 days1993: Moderate 1 of 55 days1994: Good 59 of 60 days1994: Moderate 1 of 60 days1995: Good 62 of 62 days1996: Good 62 of 63 days1996: Moderate 1 of 63 days1997: Good 298 of 365 days1997: Moderate 60 of 365 days1997: Unhealthy for Sensitive Groups 7 of 365 days19971998: Good 292 of 356 days1998: Moderate 62 of 356 days1998: Unhealthy for Sensitive Groups 2 of 356 days1999: Good 267 of 362 days1999: Moderate 95 of 362 days2000: Good 281 of 366 days2000: Moderate 85 of 366 days2001: Good 268 of 363 days2001: Moderate 90 of 363 days2001: Unhealthy for Sensitive Groups 5 of 363 days2002: Good 303 of 365 days2002: Moderate 58 of 365 days2002: Unhealthy for Sensitive Groups 4 of 365 days20022003: Good 311 of 365 days2003: Moderate 54 of 365 days2004: Good 293 of 364 days2004: Moderate 70 of 364 days2004: Unhealthy for Sensitive Groups 1 of 364 days2005: Good 342 of 365 days2005: Moderate 23 of 365 days2006: Good 291 of 361 days2006: Moderate 67 of 361 days2006: Unhealthy for Sensitive Groups 3 of 361 days2007: Good 320 of 365 days2007: Moderate 44 of 365 days2007: Unhealthy for Sensitive Groups 1 of 365 days20072008: Good 248 of 304 days2008: Moderate 51 of 304 days2008: Unhealthy for Sensitive Groups 5 of 304 days2009: Good 88 of 108 days2009: Moderate 18 of 108 days2009: Unhealthy for Sensitive Groups 2 of 108 days2010: Good 149 of 190 days2010: Moderate 41 of 190 days2011: Good 152 of 195 days2011: Moderate 43 of 195 days2012: Good 122 of 207 days2012: Moderate 78 of 207 days2012: Unhealthy for Sensitive Groups 7 of 207 days20122013: Good 157 of 275 days2013: Moderate 103 of 275 days2013: Unhealthy for Sensitive Groups 5 of 275 days2013: Unhealthy 6 of 275 days2013: Very Unhealthy 4 of 275 days2014: Good 246 of 365 days2014: Moderate 115 of 365 days2014: Unhealthy for Sensitive Groups 3 of 365 days2014: Unhealthy 1 of 365 days2015: Good 268 of 365 days2015: Moderate 96 of 365 days2015: Unhealthy for Sensitive Groups 1 of 365 days2016: Good 282 of 366 days2016: Moderate 84 of 366 days2017: Good 253 of 365 days2017: Moderate 110 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2017: Unhealthy 1 of 365 days20172018: Good 243 of 365 days2018: Moderate 114 of 365 days2018: Unhealthy for Sensitive Groups 5 of 365 days2018: Unhealthy 3 of 365 days2019: Good 296 of 365 days2019: Moderate 69 of 365 days2020: Good 284 of 366 days2020: Moderate 62 of 366 days2020: Unhealthy for Sensitive Groups 12 of 366 days2020: Unhealthy 6 of 366 days2020: Very Unhealthy 2 of 366 days2021: Good 273 of 365 days2021: Moderate 64 of 365 days2021: Unhealthy for Sensitive Groups 9 of 365 days2021: Unhealthy 12 of 365 days2021: Very Unhealthy 6 of 365 days2021: Hazardous 1 of 365 days2022: Good 290 of 364 days2022: Moderate 65 of 364 days2022: Unhealthy for Sensitive Groups 5 of 364 days2022: Unhealthy 2 of 364 days2022: Very Unhealthy 2 of 364 days20222023: Good 236 of 363 days2023: Moderate 126 of 363 days2023: Unhealthy for Sensitive Groups 1 of 363 days2024: Good 270 of 366 days2024: Moderate 95 of 366 days2024: Unhealthy for Sensitive Groups 1 of 366 days2025: Good 313 of 363 days2025: Moderate 50 of 363 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 year0501001501981: 90th percentile AQI 451982: 90th percentile AQI 491983: 90th percentile AQI 251984: 90th percentile AQI 1081985: 90th percentile AQI 1291986: 90th percentile AQI 1051987: 90th percentile AQI 221988: 90th percentile AQI 771989: 90th percentile AQI 501991: 90th percentile AQI 321992: 90th percentile AQI 321993: 90th percentile AQI 321994: 90th percentile AQI 311995: 90th percentile AQI 321996: 90th percentile AQI 321997: 90th percentile AQI 611998: 90th percentile AQI 611999: 90th percentile AQI 712000: 90th percentile AQI 672001: 90th percentile AQI 712002: 90th percentile AQI 582003: 90th percentile AQI 582004: 90th percentile AQI 612005: 90th percentile AQI 492006: 90th percentile AQI 672007: 90th percentile AQI 582008: 90th percentile AQI 642009: 90th percentile AQI 542010: 90th percentile AQI 712011: 90th percentile AQI 612012: 90th percentile AQI 802013: 90th percentile AQI 822014: 90th percentile AQI 712015: 90th percentile AQI 712016: 90th percentile AQI 612017: 90th percentile AQI 612018: 90th percentile AQI 642019: 90th percentile AQI 582020: 90th percentile AQI 712021: 90th percentile AQI 842022: 90th percentile AQI 582023: 90th percentile AQI 632024: 90th percentile AQI 612025: 90th percentile AQI 521981: Median AQI 341982: Median AQI 371983: Median AQI 191984: Median AQI 491985: Median AQI 611986: Median AQI 371987: Median AQI 101988: Median AQI 291989: Median AQI 331991: Median AQI 191992: Median AQI 191993: Median AQI 161994: Median AQI 191995: Median AQI 191996: Median AQI 161997: Median AQI 411998: Median AQI 431999: Median AQI 432000: Median AQI 442001: Median AQI 432002: Median AQI 362003: Median AQI 372004: Median AQI 322005: Median AQI 362006: Median AQI 372007: Median AQI 362008: Median AQI 412009: Median AQI 452010: Median AQI 382011: Median AQI 442012: Median AQI 482013: Median AQI 482014: Median AQI 462015: Median AQI 442016: Median AQI 432017: Median AQI 452018: Median AQI 462019: Median AQI 442020: Median AQI 422021: Median AQI 422022: Median AQI 442023: Median AQI 472024: Median AQI 452025: Median AQI 421981198619921997200220072012201720222025
  • 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
Ozone26874%
Fine particles (PM2.5)9526%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025363313500000425280Ozone
20243662709510004561105Ozone
202336323612610004763105Ozone
20223642906552204458227Ozone
202136527364912614284304Ozone
202036628462126204271210Ozone
2019365296690000445897Ozone
201836524311453004664163Ozone
201736525311011004561166Ozone
2016366282840000436193Ozone
20153652689610004471144Ozone
201436524611531004671166Ozone
201327515710356404882245Ozone
20122071227870004880112Ozone
2011195152430000446197Ozone
2010190149410000387190Ozone
2009108881820004554119Ozone
20083042485150004164129Ozone
20073653204410003658105Ozone
20063612916730003767115Ozone
2005365342230000364987Ozone
20043642937010003261105Ozone
2003365311540000375887Ozone
20023653035840003658108Ozone
20013632689050004371115Ozone
2000366281850000446797Ozone
1999362267950000437197Ozone
19983562926220004361108Ozone
19973652986070004161126Ozone
1996636210000163257PM10
1995626200000193244PM10
1994605910000193151PM10
1993555410000163260PM10
1992565510000193251PM10
1991373700000193238PM10
19892672412420003350115Ozone
19882862275180002977147CO
198733533500000102243CO
1986328212763730037105164Ozone
198535715511079121061129203Ozone
19843141691053460049108182Ozone
198335835800000192542Ozone
19826964500003749100Ozone
1981244233110000344566Ozone

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