Pollen in Ontario, CA

About pollen in Ontario

Pollen levels in Ontario are quiet today, with tree pollen sitting at essentially none. Anyone who typically reacts to airborne allergens should find the air calm and easy to manage, with little to nothing in the way of tree, grass, or weed activity to cause irritation. Looking ahead, this lull is expected to hold steady over the next several days, with tree pollen staying at a minimal level throughout the stretch. This fits the season well, as mid-November falls outside the active bloom period for local trees like liquidambar, cercis, prosopis, pithecellobium, and maple, all of which typically ramp up closer to spring. For now, allergy sufferers in the area can expect a restful stretch with little pollen to contend with.

What to do today

• Pollen is minimal today, so it's a great time to be outside.
• No special pollen precautions are needed right now.

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 has no notable tree, grass, or weed pollen today.

What plants are causing allergies in Ontario, CA?

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