Los Angeles pollen forecast — Hammer Museum neighborhood

On 20 July 2026, overall pollen levels in Los Angeles are low. Cypress is the main contributor to airborne pollen, while grass and ambrosia remain at lower levels

On 21 July 2026, pollen conditions in Los Angeles will be similar to today, with cypress at low levels, grass at low levels, ambrosia at low levels

According to the five-day outlook, cypress and grass pollen levels are expected to gradually decrease, while ambrosia pollen will increase, suggesting mixed conditions later in the week.

On 20 July 2026, Cypress is the dominant pollen source in Los Angeles. grass and ambrosia are also present but at lower levels. artemisia, birch, oak, willow, and alder are not currently active.

Hammer Museum sees the same pollen timeline as the rest of Los Angeles, beginning with olive and acacia in January before eucalyptus takes over and peaks through February. Peak grass pollen arrives in March and April, and light weed pollen carries into September. Mild year-round temperatures push the pollen calendar earlier than in most of the country throughout the year.

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.