Los Angeles pollen forecast — Hollywood Sign neighborhood

On 9 August 2026, overall pollen levels in Los Angeles are moderate. Artemisia is the main contributor to airborne pollen, while ambrosia, cypress, and grass remain at lower levels

On 10 August 2026, pollen conditions in Los Angeles will be different from today, with ambrosia at low levels, artemisia at medium levels, grass at low levels

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

On 9 August 2026, Artemisia is the dominant pollen source in Los Angeles. ambrosia, cypress, and grass are also present but at lower levels.

The pollen season at Hollywood Sign mirrors Los Angeles overall, starting with olive and acacia in January before eucalyptus extends the tree season through February. Grass pollen then peaks through March and April, and sagebrush and mugwort extend exposure into early autumn. Mild year-round temperatures push the pollen calendar earlier than in most of the country, a pattern felt across this part of Los Angeles.

The Los Angeles 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 Los Angeles, 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.