What Is the Air Quality in Elko, Nevada?
Elko, Nevada has an Air Quality Grade of C (fair) with a 5-year median AQI of 31. The dominant pollutant is Coarse Particulate Matter (PM10), and air quality has been worsening over the past decade.
Elko, Nevada Air Quality Snapshot
| Air Quality Grade | C62/100 |
| 5-Year Median AQI | 31 (Good) |
| Most Recent Median AQI (2023) | 31 (Good) |
| Dominant Pollutant | Coarse Particulate Matter (PM10) |
| 10-Year Trend | Worsening (+1.03 AQI/yr) |
| Unhealthy Days (last 5 yr) | 16 |
| National Rank (cleanest = #1) | #137 of 1,020 (13th cleanest percentile) |
| Nevada Rank | #3 of 9 |
What Does the C Grade Mean?
Elko, Nevada earns a C — air quality is fair, but not great. With a 5-year median AQI of 31, the city sees a meaningful number of "Moderate" days each year, when the EPA flags air as a concern for unusually sensitive people.
Elko, Nevada's 5-year median AQI of 31 is 10 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within Nevada, Elko, Nevada runs cleaner than the state average of 39 — a positive signal that local conditions (terrain, wind patterns, emission sources) are working in residents' favor.
For context within Nevada: Douglas, Nevada currently holds the state's cleanest grade (A, AQI 22), while Clark, Nevada sits at the bottom (D, AQI 62).
What's in Elko, Nevada's Air?
The dominant pollutant in Elko, Nevada is Coarse Particulate Matter (PM10). Coarse particulate matter — particles up to 10 micrometers across — typically comes from dust, construction sites, agriculture, unpaved roads, and natural sources like windblown soil. PM10 is less hazardous than PM2.5 because the larger particles do not penetrate as deeply into the lungs, but high levels still aggravate asthma and irritate airways.
Days by Dominant Pollutant (2023)
| Pollutant | Days as Dominant | Share of Year |
|---|---|---|
| Coarse Particulate Matter (PM10) | 182 | 50% |
| Ground-Level Ozone | 178 | 49% |
| Fine Particulate Matter (PM2.5) | 4 | 1% |
Is the Air Getting Better or Worse?
Air quality in Elko, Nevada has been getting worse over the past decade, with median AQI climbing by roughly 1.0 points per year. That bucks the national trend of broad improvement, and most often reflects either growing wildfire smoke exposure (particularly across the West) or rising local emissions from population and freight growth.
In 2014, Elko, Nevada posted a median AQI of 32. By 2023 that figure was 31 — a drop of 1 AQI points cleaner across 10 years of EPA records.
Year-by-Year AQI in Elko, Nevada
| Year | Median AQI | Good Days | Unhealthy Days | Dominant Pollutant |
|---|---|---|---|---|
| 2014 | 32 | 327 | 1 | PM10 |
| 2015 | 30 | 314 | 0 | PM10 |
| 2016 | 20 | 340 | 1 | PM10 |
| 2017 | 24 | 330 | 1 | PM10 |
| 2018 | 19 | 296 | 4 | PM10 |
| 2019 | 14 | 356 | 0 | PM10 |
| 2020 | 30 | 304 | 4 | PM10 |
| 2021 | 42 | 282 | 10 | Ozone |
| 2022 | 38 | 321 | 2 | PM10 |
| 2023 | 31 | 318 | 0 | PM10 |
Health Context for Elko, Nevada
Across the past five years, this area has logged just 16 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 3 days per year, or roughly one every other month. That is a low count by national standards.
Healthy adults can continue normal outdoor activity in most weather, but should pay attention to AQI alerts during the worst pollution windows. People with asthma, heart disease, or pregnancy should reduce prolonged or intense outdoor exertion on flagged days, and consider running an indoor HEPA air cleaner during peak season. PM10 is largely a near-source pollutant — staying upwind of busy roads, construction, and unpaved areas can substantially reduce exposure.
How This Grade Is Calculated
The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.
Elko, Nevada has an Air Quality Grade of C (fair) with a 5-year median AQI of 31. The dominant pollutant is Coarse Particulate Matter (PM10), and air quality has been worsening over the past decade.
The data source behind this answer is the EPA Air Quality System (AQS). Every figure on the page traces back to that source; the methodology page describes the inputs and the refresh cadence in full detail.
A practical caveat: the headline answer above reflects the most recent the EPA Air Quality System (AQS) vintage; underlying data is often revised for months after first publication, and the right reference for any specific decision is whichever vintage is current at the time of the decision. The as-of date is stamped on every page.
Source: EPA Outdoor Air Quality Data, 2026.