Low Pollen in Ontario, CA

About pollen in Ontario

Pollen levels in Ontario are low today, with weeds as the only real contributor to the count. Trees are quiet, so anyone sensitive to weed pollen may notice mild effects, but overall conditions are easy to manage for most people. Looking ahead, weed pollen is expected to hold steady at this same low level through the next several days, with no significant swings anticipated. Tree pollen should remain absent for now, which lines up with the season, since local varieties like liquidambar, maple, and mesquite typically shed their pollen earlier in the year. As late summer continues, weeds are the main thing to keep an eye on, and current conditions suggest a calm stretch ahead.

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 weed pollen. The five-day outlook holds steady around 2 of 5.

Is weed pollen high in Ontario, 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 Ontario, CA?

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