Low Pollen in Pasadena, CA

About pollen in Pasadena

Weed pollen is the most active type in Pasadena today, though it remains at a low level overall. Grass is present but barely registers, and tree pollen is absent entirely. For most people, today's air should feel comfortable, with only those especially sensitive to weeds likely to notice any mild effects. Looking ahead, this pattern should hold steady through the week, with weed levels easing slightly by the final day and grass staying low and consistent throughout. This is typical for mid-October, as autumn is prime season for weeds like ragweed, while trees such as citrus, ash, and cedrus remain dormant until their active periods return in spring. With tree pollen quiet and grass minimal, weed exposure is the main factor worth keeping in mind this week.

What to do today

• It's a good day for outdoor activities since pollen levels are low.
• Do you know which plants cause your pollen allergy? Check out the pollen data to be prepared.

Tree map

Every dot is a tree near Pasadena, colored by how allergenic it is. Click one for its details, and zoom in for a closer look.

Top tree-pollen sources

The local tree genera behind today's pollen near Pasadena. Each bar is that genus's share of the tree pollen.

Meet the trees near you

Get to know the tree types growing around Pasadena: what each looks like, how allergenic it is, and when it blooms.

London plane

Platanus acerifolia

Allergenicity 4/4Blooms spring

Bradford pear

Pyrus calleryana

Allergenicity 1/4Blooms spring

Chinese evergreen elm

Ulmus parvifolia

Allergenicity 3/4Blooms spring

Oak species

Quercus

Allergenicity 4/4Blooms spring

Shamel ash

Fraxinus uhdei

Allergenicity 4/4Blooms spring

Italian cypress

Cupressus sempervirens

Allergenicity 4/4Blooms winter,spring

Chinese elm

Ulmus parvifolia

Allergenicity 3/4Blooms spring

Glossy privet

Ligustrum lucidum

Allergenicity 2/4Blooms spring

American sweetgum

Liquidambar styraciflua

Allergenicity 2/4Blooms spring

White mulberry

Morus alba

Allergenicity 5/4Blooms spring

Maidenhair tree

Ginkgo biloba

Allergenicity 1/4Blooms spring

Siberian elm

Ulmus pumila

Allergenicity 3/4Blooms spring

Aleppo pine

Pinus halepensis

Allergenicity 1/4Blooms spring

Arizona ash

Fraxinus velutina

Allergenicity 4/4Blooms spring

Japanese black pine

Pinus thunbergiana

Allergenicity 1/4Blooms spring

Monterey pine

Pinus radiata

Allergenicity 1/4Blooms spring

Common questions

What is the pollen count in Pasadena, CA today?

Pasadena, CA is at a low 2 out of 5 on the Universal Pollen Index today, driven mainly by weed pollen. Over the next five days it ranges from 1 to 2 of 5.

Is weed pollen high in Pasadena, CA right now?

Weed pollen is low today at 2 of 5, and it's past its peak season. Most people won't have symptoms.

What plants are causing allergies in Pasadena, CA?

The main sources right now are Citrus, Ash, Prunus, Cedrus, and Malus.