Pittsburg pollen forecast - today, tomorrow and the week ahead
Pollen Today
Today (20 September) pollen in Pittsburg is high; grass and ragweed are high.
Pollen Tomorrow
Tomorrow (21 September 2026) grass remains high, ragweed remains high, mugwort at low levels.
7-Day Trend
Over the next week mugwort will increase; grass and ragweed will decrease.
Explore Forecasts
Air Quality
Pollen for Neighborhoods
Air Quality in Other Cities
Get More in Our App
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) | High | 55/100 |
| Willow (Salicaceae) | None | 0/100 |
| Mugwort (Artemisia) | None | 0/100 |
| Ragweed (Ambrosia) | High | 59/100 |
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) | High | 68/100 | |
| Willow (Salicaceae) | None | 0/100 | — |
| Mugwort (Artemisia) | Low | 9/100 | |
| Ragweed (Ambrosia) | High | 70/100 |
Local Environmental Conditions
Pittsburg's East Bay California delta setting features valley oak, cottonwood, and willow as the main tree pollen sources, with exposure varying between the greener residential hillside areas and the more built-up industrial waterfront corridor. The Sacramento-San Joaquin Delta proximity creates a distinctive local pollen environment, while the Carquinez Strait channels the Delta breeze that creates distinct windward and leeward pollen exposure zones across the city.
Pittsburg's East Bay California setting produces a season opening in January with oak and olive before grass from surrounding Contra Costa County land peaks through April and May. Mugwort extends exposure into September, while the inland delta setting means temperatures are higher than in coastal Bay Area cities and the Sacramento River Delta channels airflows during the spring season.
Get pollen & AQ on Strava
Follow your environmental exposure and performance with the free Airmine-Strava integration. See your pollen and air quality exposure for every Strava activity.
Resource Hub
Pollen forecast neighborhoods 1 neighborhood
Frequently Asked Questions About Pollen in California
Is pollen high in Pittsburg right now?
On 20 September 2026, overall pollen levels in Pittsburg are high. Grass is the main contributor to airborne pollen, while ambrosia remain at lower levels
Will pollen levels change in Pittsburg tomorrow?
On 21 September 2026, pollen conditions in Pittsburg will be different from today, with grass at high levels, ambrosia at high levels, artemisia at low levels
Is pollen expected to decrease in Pittsburg this week?
According to the five-day outlook, grass and ambrosia pollen levels are expected to gradually decrease, while artemisia pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Pittsburg?
On 20 September 2026, Grass is the dominant pollen source in Pittsburg. ambrosia are also present but at lower levels. artemisia are not currently active.
When is pollen season in Pittsburg?
How often is the Pittsburg pollen forecast updated?
The Pittsburg pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Pittsburg 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 Pittsburg 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 Pittsburg, 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).
