Pollen levels at Gresham, Oregon, United States: index 4/4 (Very High). No significant pollen activity detected.
Oregon, United States
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Sign In 74 / 100 · Outdoor Activity Score
Caution health.score.decisionLine.caution.pollen
Pollen −12 Rain −10 Humidity −4
Pollen Forecast
Very High
4
Index (0–4)
24h
Now+24h
- Tree Pollen
- High
- Grass Pollen
- Very High
- Weed Pollen
- Moderate
Dominant species: Timothy, Bermuda Grass
Very high levels. Stay indoors as much as possible.
Estimated based on location, season & weather conditions
Frequently Asked Questions
What are the current pollen levels at Gresham?
The current pollen index at Gresham, Oregon, United States is 4 out of 4, rated as Very High. No significant pollen activity detected.
When is pollen season at Gresham?
Pollen season at Gresham typically runs from March to October. Grass pollen peaks in late spring and summer, while birch and alder are most active in early spring. Olive pollen peaks in May–June in Mediterranean regions.
Is Gresham good for allergy sufferers?
Current conditions at Gresham show a pollen level of Very High. Very high levels. Stay indoors as much as possible. Check our hourly trend chart for the best times to be outdoors.
How is the pollen forecast calculated?
Our pollen forecast uses the CAMS (Copernicus Atmosphere Monitoring Service) model, which tracks 6 major pollen types: birch, olive, grass, alder, ragweed, and mugwort. Data is updated hourly with 24-hour forecasts.