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Gathering pollen, air quality, and weather data for you.
Gathering pollen, air quality, and weather data for you.
Pollen Level
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Air Quality
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Los Altos's allergy season varies with proximity to the coast. Coastal breezes help, but residents of Los Altos, CA can still experience significant pollen from February through October, especially during dry, warm spells.
Right now: August brings weed pollen to Los Altos and the start of wildfire season affects air quality.
Spring
Feb – May
Tree pollen starts early — alder, birch, and oak are primary triggers.
Summer
May – Jul
Grass pollen peaks. Inland valleys see significantly higher counts than the coast.
Fall
Aug – Oct
Ragweed and sagebrush in drier areas. Coastal cities see lower counts.
Ocean breezes near Los Altos can help clear pollen, but inland valleys trap allergens. Wildfire season also degrades air quality significantly. PollenTracker monitors both pollen and AQI to give you the full picture.
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Google UPI 0/5
Google UPI 0/5
Weather
78°F
Sunny · 60% humidity · 7 mph wind
YES
Ragweed pollen is moderate with calm conditions. Most people can head out comfortably.
Air quality: AQI is 37 (good).
Best hours: 16:00-18:00
Hourly pollen risk is estimated from weather trends when no live hourly pollen feed is available.
Informational only. Not medical advice. For health concerns, please consult a qualified healthcare provider. Editorial standards.