Las Vegas pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Las Vegas is high; ragweed is high; grass and mugwort are moderate.
Pollen Tomorrow
Tomorrow (21 September 2026) levels are similar to today.
7-Day Trend
Over the next week grass, mugwort, and ragweed will decrease.
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Local pollen and air quality forecasts, interactive pollen maps and route profiles
Features and forecast availability vary by region.
Pollen Risk
Today - 20 September
| Pollen species | Level | Value |
|---|---|---|
| Alder (Alnus) | None | 0/100 |
| Birch (Betula) | None | 0/100 |
| Hazel (Corylus) | None | 0/100 |
| Cypress (Cupressaceae) | None | 0/100 |
| Grass (Poaceae) | Moderate | 45/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | Moderate | 31/100 |
| Ragweed (Ambrosia) | High | 70/100 |
Tomorrow - 21 September
| Pollen species | Level | Value | 7-Day Trend |
|---|---|---|---|
| Alder (Alnus) | None | 0/100 | — |
| Birch (Betula) | None | 0/100 | — |
| Hazel (Corylus) | None | 0/100 | — |
| Cypress (Cupressaceae) | None | 0/100 | — |
| Grass (Poaceae) | Moderate | 41/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Moderate | 28/100 | |
| Ragweed (Ambrosia) | High | 70/100 |
Local Environmental Conditions
Las Vegas' irrigated desert landscape features introduced mulberry, olive, and cypress as the dominant allergenic tree pollen sources across residential streets and parks, contrasting sharply with the surrounding Mojave Desert. Exposure varies between these irrigated green areas and the more arid urban core, while the flat, open basin allows pollen to disperse widely and the minimal natural vegetation means almost all local sources are from urban plantings.
Las Vegas' pollen season is dominated by introduced species, with olive and mulberry producing intense tree pollen from February through April. The dry desert climate suppresses mid-season pollen, though introduced grasses contribute through spring. The long, hot summer largely eliminates late season exposure. The flat desert basin concentrates pollen under calm conditions during spring, while the minimal natural vegetation means local sources are almost entirely from irrigated urban plantings.
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Resource Hub
Pollen forecast neighborhoods 13 neighborhoods
Sports venues in Las Vegas 4 sports venues
Popular Local Routes 2 routes
Frequently Asked Questions About Pollen in Nevada
Is pollen high in Las Vegas right now?
On 20 September 2026, overall pollen levels in Las Vegas are high. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels
Will pollen levels change in Las Vegas tomorrow?
On 21 September 2026, pollen conditions in Las Vegas will be similar to today, with ambrosia at high levels, artemisia at moderate levels, grass at moderate levels
Is pollen expected to decrease in Las Vegas this week?
According to the five-day outlook, ambrosia, artemisia, and grass pollen levels are expected to gradually decrease, suggesting improving conditions later in the week.
Which pollen types are currently active in Las Vegas?
On 20 September 2026, Ambrosia is the dominant pollen source in Las Vegas. artemisia and grass are also present but at lower levels.
When is pollen season in Las Vegas?
How often is the Las Vegas pollen forecast updated?
The Las Vegas pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Las Vegas come from nearby or far away?
Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.
Are pollen levels in Las Vegas based on measurements or forecasts?
Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.
Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Las Vegas, modern forecasts combine recent measurements, weather data, and information about local vegetation.
This allows us to estimate pollen levels for today and the coming days, not just report the past.
Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.
Understanding the Scale
The 0–100 scores represent risk levels, not direct measurements of pollen or air pollutant concentrations. Higher scores indicate higher risk. Pollen and air quality use different thresholds.
Pollen
| None | 0 | No or negligible risk of exposure. Pollen/mold exposure is expected to be minimal. |
| Low | 0-25 | Low risk of exposure. Small amounts of pollen or mold spores may be present. |
| Moderate | 25-50 | Moderate risk of exposure. Pollen/mold exposure is expected to be noticeable. |
| High | 50-75 | High risk of exposure. Elevated pollen/mold exposure is expected. |
| Very High | 75-100 | Very high risk of exposure. Pollen/mold exposure is expected to be at or near its highest levels. |
Get More in the Airmine Pollen app
Get 15-day pollen forecasts with morning, afternoon and evening detail, plus 5-day air quality forecasts. Explore interactive pollen risk maps, estimated pollen season start, route profiles and a symptoms diary.
Features and forecast availability vary by region. Currently covering Europe, the contiguous US, southern Canada, South Africa, Australia, Indonesia (Java & Bali), Brazil, Paraguay, Uruguay and the Buenos Aires area.
Developed with support from the European Space Agency (ESA) Business Applications and Space Solutions (BASS).
