Las Vegas Air Quality in January
Across 2019–2025, Las Vegas's January air quality had a median AQI of 59 (Moderate) over 217 monitored days in the Las Vegas-Henderson-Paradise, NV area. 2.8% of January days (6 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 80.2% of days. The cleanest January on record here was 2023 (median AQI 51, 0 days above 100) and the worst was 2024 (median 60, 2 days above 100, peak AQI 140).
- Good: 29.0%
- Moderate: 68.2%
- Unhealthy for Sensitive Groups: 2.3%
- Unhealthy or worse: 0.5%
Reduce Indoor Ozone in Las Vegas
Today's main pollutant in Las Vegas is ground-level ozone (AQI 31). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Las Vegas in January?
Moderate on a typical day: median AQI 59 across 2019–2025, with 2.8% of January days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓29.0% of January days were Good (AQI 0–50), 68.2% Moderate (51–100).
- ✓6 days of 217 reached AQI 101+; the January peak was 160.
- ✓Best January: 2023; worst January: 2024.
Frequently asked questions
What is the air quality like in Las Vegas in January?▾
Across 2019–2025, the median daily AQI in Las Vegas in January was 59 (Moderate). 29.0% of days were Good, 68.2% Moderate, and 2.8% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is January a good time for outdoor exercise in Las Vegas?▾
A typical January day in Las Vegas is Moderate (median AQI 59): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 36 of January days (2.8%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Las Vegas's January air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 80.2% of January days in Las Vegas. The highest January AQI recorded in 2019–2025 was 160 (Unhealthy), in 2024.
Las Vegas January air quality, year by year
Las Vegas January air quality by year (Las Vegas-Henderson-Paradise, NV, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 54 | 0 | 88 | PM2.5 |
| 2020 | 31 | 65 | 1 | 160 | PM2.5 |
| 2021 | 31 | 63 | 1 | 112 | PM2.5 |
| 2022 | 31 | 65 | 1 | 112 | PM2.5 |
| 2023cleanest | 31 | 51 | 0 | 72 | PM2.5 |
| 2024worst | 31 | 60 | 2 | 140 | PM2.5 |
| 2025 | 31 | 61 | 1 | 125 | PM2.5 |
What January air means in Las Vegas
A typical January day in Las Vegas is Moderate (median AQI 59): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 36 of January days (2.8%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
January's median AQI of 59 is in line with Las Vegas's whole-year median of 62, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median January AQI across every EPA metro area (95,602 metro-days, 2019–2025) is 39, so Las Vegas runs above the national January norm; 2.8% of its January days topped AQI 100 versus 0.7% nationally (above average).
January is part of Las Vegas's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Las Vegas
The latest EPA AirNow observation puts Las Vegas's AQI at 31 (O3). The figures above are multi-year month statistics, not today's reading.
View current Las Vegas air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Las Vegas-Henderson-Paradise, NV), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.