Very High Pollen in Ontario, CA

About pollen in Ontario

Tree pollen is dominating the air in Ontario today, and levels are very high. Anyone sensitive to tree pollen should expect noticeable symptoms, from itchy eyes to a stuffy or runny nose. Plane, oak, ash, Schinus, and pine trees are the main contributors right now, and their combined output is enough to affect even those with mild sensitivities. Looking ahead, tree pollen is expected to remain a significant presence over the next few days, with no real relief in sight. While spring is typically the peak season for tree pollen, some species, including pine and Schinus, can linger into summer, keeping counts elevated longer than usual. It's worth keeping an eye on daily conditions if you're prone to allergies, since this extended activity may continue for a while before it starts to ease.

What to do today

• Pollen is very high today; stay indoors when you can, especially midday and afternoon.
• Keep windows closed and run air on recirculate.
• Shower and change clothes right after coming inside.
• Consider allergy medication, and see a clinician if symptoms are severe.

Tree map

Every dot is a tree near Ontario, 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 Ontario. Each bar is that genus's share of the tree pollen.

Meet the trees near you

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

American sweetgum

Liquidambar styraciflua

Allergenicity 2/4Blooms spring

Ornamental pear

Pyrus calleryana

Allergenicity 1/4Blooms spring

Silver maple

Acer saccharinum

Allergenicity 3/4Blooms spring

Tulip tree

Liriodendron tulipifera

Allergenicity 1/4Blooms spring

Chinese elm

Ulmus parvifolia

Allergenicity 3/4Blooms spring

Canary island pine

Pinus canariensis

Allergenicity 1/4Blooms spring

Aleppo pine

Pinus halepensis

Allergenicity 1/4Blooms spring

Coast live oak

Quercus agrifolia

Allergenicity 4/4Blooms spring

Leaf plum purple

Prunus cerasifera

Allergenicity 1/4Blooms spring

London plane

Platanus acerifolia

Allergenicity 4/4Blooms spring

Evergreen pear

Pyrus kawakamii

Allergenicity 1/4Blooms spring

Holly oak

Quercus ilex

Allergenicity 4/4Blooms spring

London plane bloodgood

Platanus acerifolia

Allergenicity 4/4Blooms spring

Shamel ash

Fraxinus uhdei

Allergenicity 4/4Blooms spring

Glossy privet

Ligustrum lucidum

Allergenicity 2/4Blooms spring

Japanese black pine

Pinus thunbergiana

Allergenicity 1/4Blooms spring

Common questions

What is the pollen count in Ontario, CA today?

Ontario, CA is at a very high 5 out of 5 on the Universal Pollen Index today, driven mainly by tree pollen. The five-day outlook holds steady around 5 of 5.

Is tree pollen high in Ontario, CA right now?

Tree pollen is very high today at 5 of 5. Most allergy sufferers will have symptoms.

What plants are causing allergies in Ontario, CA?

The main sources right now are Plane, Oak, Ash, Schinus, and Pine.