State air quality · 2025

Nevada Air Quality Ranking

Across 9 monitored counties, the typical county in Nevada posts a median AQI of 41 (Good) and 76.5% of monitored days were rated Good, from EPA AQS.

41
Avg median AQI
76.5%
Good-air days
9
Counties monitored
48%
Cleaner than US states

Nevada's typical county median AQI is 41 (Good) across 9 monitored counties

According to the U.S. EPA Air Quality System, Nevada monitors 9 counties with a day-weighted Good-day share of 76.5%. Cleanest: Nye County (92.6% Good). Most polluted: Clark County (31.0%). These are annual summaries, not live AirNow readings.

Data source EPA Air Quality System (AQS)

Cleaner than US states
Nevada's day-weighted Good-day share of 76.5% places it cleaner than 48% of US states.
In-state spread
Within Nevada, Nye County leads at 92.6% Good days while Clark County sits at 31.0% across 9 monitored counties.
2024→2025 release
Nevada's Good-day share moved +3.9 points vs the 2024 EPA annual release.
Typical median AQI
Typical median AQI: 41

Verify with AirNow → · EPA AQS →

EPA state monitoring brief

AQS state key NEVADA

Nevada · 2025 EPA AQS · 9 counties · med AQI 41 · 76.5% Good · Nye→Clark spread

  • GOOD 41 Median AQI · Good
  • SHARE 76.5% Good-day share
  • COUNT 9 Counties monitored
  • UNH 2 Unhealthy+ days
  • RANK 48% Cleaner than states
  • O3 61.7% Main pollutant share

Good-day share peers

Minnesota76.8%Connecticut76.7%Nevada (this)76.5%Wisconsin76.5%
Good-day share neighbourhood · nearest ABS peers vs Nevada

Nevada's 76.5% Good-day share is cleaner than 48% of monitored US states; Nye and Clark County bracket the in-state range. Open Nye County →

According to EPA AQS annual summaries on PlainAirData, Nevada ranks #27 of 52 by day-weighted good-day share (76.5%) and #37 by mean county median AQI (41.0). Hawaii is #1 of 52 by day-weighted good-day share (93.8% of monitored days) at mean county median-AQI #4 (27.3) ≠ Alaska #1 lowest mean county median AQI (20.3) at good-day share #8 (84.4%).

Data updated August 2026

What changed, what drives it, and how thick is the sample

Three derived views WPR-style word count does not substitute for: release-over-release movement from county annual rows, the EPA main-pollutant day mix, and how many counties sit below the 100-day ranking floor.

Release change

76.5%

Good-day share in 2025, up 3.9 percentage points vs 2024. County-mean median AQI 41, within half a point of the 2024 county-mean median.

Pollutant mix

Ozone

Main driver on 61.7% of pollutant-assigned days.

  • Ozone 61.7%
  • PM2.5 20.7%
  • PM10 17.5%

Monitoring coverage

360

Average monitored days per county in the latest release. Every monitored county clears the 100-day ranking floor.

Counties Monitored

9

Good Days %

76.5%

Avg Median AQI

41

Total Unhealthy Days

2

Best Air Quality

Nye County

Worst Air Quality

Clark County

Where Nevada sits nationally

COUNT-derived placement among 52 US states with at least 365 monitored days in the latest county release. Nevada's day-weighted Good-day share is 76.5% - cleaner than 48% of that comparison set.

Nevada Good-day share vs. every US state

Day-weighted share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release

76.5% 48th percentile higher than 48% of 52 US states

0.0%–5.0%: 0 US states (0%). Below this entry. 5.0%–10.0%: 0 US states (0%). Below this entry. 10.0%–15.0%: 0 US states (0%). Below this entry. 15.0%–20.0%: 0 US states (0%). Below this entry. 20.0%–25.0%: 0 US states (0%). Below this entry. 25.0%–30.0%: 0 US states (0%). Below this entry. 30.0%–35.0%: 0 US states (0%). Below this entry. 35.0%–40.0%: 0 US states (0%). Below this entry. 40.0%–45.0%: 0 US states (0%). Below this entry. 45.0%–50.0%: 0 US states (0%). Below this entry. 50.0%–55.0%: 0 US states (0%). Below this entry. 55.0%–60.0%: 0 US states (0%). Below this entry. 60.0%–65.0%: 2 US states (4%). Below this entry. 65.0%–70.0%: 9 US states (17%). Below this entry. 70.0%–75.0%: 11 US states (21%). Below this entry. 75.0%–80.0%: 11 US states (21%). This entry sits in this band. 80.0%–85.0%: 13 US states (25%). Above this entry. 85.0%–90.0%: 5 US states (10%). Above this entry. 90.0%–95.0%: 1 US states (2%). Above this entry. 95.0%–100.0%: 0 US states (0%). Above this entry. 100.0%–105.0%: 0 US states (0%). Above this entry. This state 0.0% 100% every floor-qualified US state, bucketed by value

Each bar is a band; taller bars hold more US states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025

Which counties in Nevada have the cleanest and most polluted air?

Cleanest counties in Nevada

Share of monitored days rated Good (AQI 0–50)

  1. 1 Nye County 92.6%
  2. 2 Douglas County 91.1%
  3. 3 Lyon County 90%
  4. 4 Elko County 86.3%
  5. 5 Carson City County 86.2%
  6. 6 Churchill County 85.2%
  7. 7 White Pine County 77%
  8. 8 Washoe County 50.1%
  9. 9 Clark County 31%

Good-day share · EPA Air Quality System

County Good % Median AQI
Nye 92.6% 26
Douglas 91.1% 22
Lyon 90.0% 41
Elko 86.3% 42
Carson City 86.2% 42
Churchill 85.2% 40
White Pine 77.0% 45
Washoe 50.1% 50
Clark 31.0% 61

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025. See our methodology for how AQI and median figures are computed.

Coverage: 9 counties in Nevada with active monitoring stations. Unmonitored counties are not represented.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files, aggregated to the state level · 2020–2025

Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.

Informational only, not professional advice. Data from EPA AQS. See our disclaimer.