Costa Mesa pollen forecast - today, tomorrow and the week ahead
Today (9 August) pollen in Costa Mesa is medium; mugwort and ragweed are medium; cypress and grass are low. Tomorrow (10 August 2026) levels are similar. Over the following five days grass, mugwort, and ragweed will increase; cypress will decrease. Forecasts are calculated by Airmine using satellites to map local vegetation and determine pollen season onset.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Costa Mesa's coastal setting near Newport Bay features eucalyptus, palm, and introduced oak as the main tree pollen sources in parks and along streets, with exposure varying between these green areas and the more built-up city centre. Surrounding Orange County urban areas contribute additional tree and grass pollen, while onshore Pacific winds frequently disperse urban pollen across the coastal plain.
Today - 9 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
3/100
-
Grass (Poaceae):
Low
11/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
34/100
-
Ragweed (Ambrosia):
Medium
35/100
High pollen levels may trigger sneezing, itchy eyes, and congestion. Airmine's neighbourhood estimates use satellites to map local vegetation and a statistical prediction model, updated four times daily.
Tomorrow - 10 August
-
Alder (Alnus):
None
0/100
-
Birch (Betula):
None
0/100
-
Hazel (Corylus):
None
0/100
-
Cypress (Cupressaceae):
Low
1/100
-
Grass (Poaceae):
Low
11/100
-
Willow (Salicaceae):
None
0/100
-
Mugwort (Artemisia):
Medium
32/100
-
Ragweed (Ambrosia):
Medium
35/100
Air quality in Costa Mesa
View air qualityFrequently Asked Questions
Is pollen high in Costa Mesa right now?
On 9 August 2026, overall pollen levels in Costa Mesa are moderate. Ambrosia is the main contributor to airborne pollen, while artemisia, cypress, and grass remain at lower levels
Will pollen levels change in Costa Mesa tomorrow?
On 10 August 2026, pollen conditions in Costa Mesa will be similar to today, with ambrosia at medium levels, artemisia at medium levels, cypress at low levels, grass at low levels
Is pollen expected to decrease in Costa Mesa this week?
According to the five-day outlook, cypress pollen levels are expected to gradually decrease, while ambrosia, artemisia, and grass pollen will increase, suggesting mixed conditions later in the week.
Which pollen types are currently active in Costa Mesa?
On 9 August 2026, Ambrosia is the dominant pollen source in Costa Mesa. artemisia, cypress, and grass are also present but at lower levels.
When is pollen season in Costa Mesa?
How often is the Costa Mesa pollen forecast updated?
The Costa Mesa pollen forecast is updated four times daily. See the timestamp below for the most recent update.
Does pollen in Costa Mesa 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 Costa Mesa 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 Costa Mesa, 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.
Want to see pollen forecasts for other cities in United States?
Check pollen in other popular cities:
Data provided by Airmine — Last update: 10 August 2026 at 02:34 CEST (Data is updated four times daily.)
This page provides the latest public pollen forecast for Costa Mesa.
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Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.