What this solves
"Las Vegas is in the desert, so the air is clean" was true in 1990. Today, PM2.5 from California wildfires and the Mojave national preserves drifts into the valley on prevailing southwest winds from late May through early October. The Strip hotels run air filtration good enough to keep guest rooms at AQI 30–50 even when outdoor AQI is 150+. The pool deck, the Strip sidewalk, and the open-top tour bus do not get that filtration.
This calculator models your month, planned exposure level, and group composition (asthma, kids, elderly), then tells you the indoor backup plan and the AQI threshold above which outdoor time should be cancelled.
The smoke-and-outdoor-plans calculator
2026 smoke season profile (Las Vegas valley)
Indoor backup options
When AQI is 150+ outside, indoor is mandatory for sensitive groups. Options: casino floors (MERV-13+ filtration, AQI 30–50), AREA15 (immersive AC venue), the Mob Museum (Downtown AC), Omega Mart (Meow Wolf), the Neon Museum (partially outdoor — check hourly), or the STRAT observation deck (windows stay closed).
N95 reality
A well-fitted N95 reduces PM2.5 inhalation by ~95%. The Strip sells them at CVS for $4–$8. If you plan any smoke-season outdoor activity, bring 2–3 per person per day. Cloth masks and surgical masks do not filter PM2.5 meaningfully.
How to read the result
- AQI 0–50 (Good): outdoor time fine for everyone, all activities.
- AQI 51–100 (Moderate): outdoor time fine for healthy adults. Sensitive groups should limit heavy outdoor exertion to 1–2 hours.
- AQI 101–150 (Unhealthy for Sensitive Groups): anyone with asthma, kids under 8, and adults over 65 should move to indoor or pool-shaded activities. Healthy adults fine for short walks with N95.
- AQI 151–200 (Unhealthy): everyone reduces outdoor activity. Sensitive groups stay indoors. N95 strongly recommended for any outdoor time.
- AQI 201+ (Very Unhealthy / Hazardous): stay indoors. If your trip includes this, treat it like a heat wave — plan indoor days, hit pools when wind shifts clear AQI down to 100.
- Daily AQI is published at AirNow.gov and updated hourly. Check before booking any Valley of Fire or Red Rock drive.
Limitations
- The "average smoke days per month" is a 3-year average. Individual months vary widely — July 2024 had 16 smoke days, July 2023 had 6.
- AQI is reported from a handful of valley monitors and does not capture micro-variations — west-side neighborhoods (Summerlin) typically see different readings than east-side (Henderson) on the same day.
- The calculator uses typical patterns. A specific week's smoke forecast depends on active fires 500+ miles away. There is no way to forecast this 90 days out.
- Strip hotels do not all filter equally. Wynn/Encore, Venetian, and Four Seasons publish MERV-13 ratings; older properties may filter less aggressively. Ask the front desk or check the in-room air-quality display.
- Ozone is a separate summer problem: in July–August afternoons, ground-level O3 often hits 70–90 ppb. The calculator does not model ozone.
FAQ
Has Vegas air really gotten worse?
Yes. EPA data shows the average annual PM2.5 reading in Clark County has climbed 35% since 2018. The driver is regional wildfire smoke, not local emissions. Local air-quality controls have actually tightened in the same period.
Should I cancel my summer Vegas trip?
No. Most days are clear. Smoke days are episodic, not constant — typically 1–3 days in a row, then clean again. Plan indoor or pool activities for your highest-risk days and you will be fine.
Is the pool safe during a smoke day?
Partially. Pool decks are outdoor, so you are still breathing ambient AQI — but the water itself is fine. A short swim is lower exposure than a 2-hour hike. Sensitive groups should still avoid prolonged pool-deck time when AQI is 150+.
What about the "but I can't smell smoke" check?
Smell is not a reliable AQI proxy. PM2.5 can be at unhealthy levels before you smell anything (the nose detects gases and larger particles, not PM2.5 specifically). Always check AirNow.gov.
Sources
- EPA AirNow — Las Vegas valley AQI monitoring, hourly 2022–2026
- Clark County Department of Air Quality — annual air quality reports 2018–2024
- EPA Air Quality Trends Report — PM2.5 by CBSA, 2018–2024
- California Department of Forestry and Fire Protection (CAL FIRE) — fire perimeter data
- U.S. Forest Service — wildland fire smoke impact modeling