Napa pollen forecast — Napa Valley neighborhood

On 30 August 2026, overall pollen levels in Napa are low. Ambrosia is the main contributor to airborne pollen, while artemisia and grass remain at lower levels

On 31 August 2026, pollen conditions in Napa will be similar to today, with ambrosia at low levels, artemisia at low levels, grass at low levels

According to the five-day outlook, ambrosia, artemisia, and grass pollen levels will increase later in the week.

On 30 August 2026, Ambrosia is the dominant pollen source in Napa. artemisia and grass are also present but at lower levels. cypress are not currently active.

Napa Valley follows Napa's established pollen calendar, beginning with acacia and oak from January before olive peaks during February and March. A grass pollen peak follows through March and April; grass and weed pollen persist into early autumn. The Mediterranean climate and dry summer largely suppress mid-season pollen across the region, which shapes conditions at Napa Valley much as it does elsewhere in Napa.

The Napa pollen forecast is updated four times daily. See the timestamp below for the most recent update.

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.

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 Napa, 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.