Las Vegas Air Quality in March
Across 2019–2025, Las Vegas's March air quality had a median AQI of 48 (Good) over 217 monitored days in the Las Vegas-Henderson-Paradise, NV area. 0.5% of March days (1 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 76.5% of days. The cleanest March on record here was 2020 (median AQI 44, 0 days above 100) and the worst was 2024 (median 47, 1 day above 100, peak AQI 134).
- Good: 65.9%
- Moderate: 33.6%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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
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How is the air in Las Vegas in March?
Good on a typical day: median AQI 48 across 2019–2025, with 0.5% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓65.9% of March days were Good (AQI 0–50), 33.6% Moderate (51–100).
- ✓1 day of 217 reached AQI 101+; the March peak was 134.
- ✓Best March: 2020; worst March: 2024.
Frequently asked questions
What is the air quality like in Las Vegas in March?▾
Across 2019–2025, the median daily AQI in Las Vegas in March was 48 (Good). 65.9% of days were Good, 33.6% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Las Vegas?▾
A typical March day in Las Vegas sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
Which pollutant causes Las Vegas's March air quality problems?▾
Ground-level ozone set the daily AQI on 76.5% of March days in Las Vegas. The highest March AQI recorded in 2019–2025 was 134 (Unhealthy for Sensitive Groups), in 2024.
Las Vegas March air quality, year by year
Las Vegas March 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 | 46 | 0 | 80 | O3 |
| 2020cleanest | 31 | 44 | 0 | 56 | O3 |
| 2021 | 31 | 49 | 0 | 63 | O3 |
| 2022 | 31 | 51 | 0 | 74 | O3 |
| 2023 | 31 | 49 | 0 | 71 | O3 |
| 2024worst | 31 | 47 | 1 | 134 | O3 |
| 2025 | 31 | 47 | 0 | 67 | O3 |
What March air means in Las Vegas
A typical March day in Las Vegas sits in the Good range (median AQI 48), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of March days reached AQI 101+ in 2019–2025.
March's median AQI of 48 is below Las Vegas's whole-year median of 62, making it one of the area's cleaner periods. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Las Vegas runs above the national March norm; 0.5% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Las Vegas's spring season (March, April, May); the spring 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.