Low Pollen in Ontario, CA

About pollen in Ontario

Tree pollen is the main driver in Ontario today, registering Very High and pushing the overall index to 5. Local sources like plane, oak, ash, schinus, and pine are all in the mix at this level. Grass pollen sits at Moderate (3) and is expected to ease over the next several days, settling to a steady Low-to-Moderate level (2) through the rest of the forecast. The grass contribution is in line with the late-spring to early-summer season, when grasses typically run higher. No data is available for tree pollen beyond today or for weed pollen at this time. Sensitive residents may notice more tree-driven exposure outdoors while levels remain elevated.

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 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 low 2 out of 5 on the Universal Pollen Index today, driven mainly by grass pollen. The five-day outlook holds steady around 2 of 5.

Is grass pollen high in Ontario, CA right now?

Grass 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 Ontario, CA?

The main sources right now are Liquidambar, Cercis, Prosopis, Pithecellobium, and Maple.