Tree Pollen Count in Ottawa, IL

Pollen by type in Ottawa

• Ottawa grass pollen count
• Ottawa ragweed pollen count
• Ottawa pollen count

What is the tree pollen count in Ottawa today?

The Ottawa tree pollen index today is 0.6 (Low) on Pollen Atlas’s modelled 0–100 scale. Low

Modelled pollen risk index — not a measured count.

Ottawa’s overall pollen count today is 19 (Low) across all types. See the full Ottawa pollen count for the overall index and every type together.

Ottawa is a city in LaSalle County, Illinois. Its population is 18,714 (ACS 2023).

Ottawa Tree Pollen Count: 5-Day Forecast

Pollen Atlas models the daily detail as an overall index: day-by-day splits by individual pollen type are not part of the modelled data, so this table shows Ottawa’s overall trend across the week. Today’s tree pollen reading is the headline above.

Species driving Ottawa’s tree pollen

Species-level counts are not part of the modelled data Pollen Atlas publishes — the modelled index is reported per pollen type, not per species — so this section gives the type summary: tree pollen reads 0.6 (Low) today. The plant-by-plant detail that is available, from the Google Pollen API, is in the next section.

Plants affecting Ottawa now — tree pollen

Detailed plant-by-plant readings for the tree pollen category were not returned in today’s source data for Ottawa. The type summary stands: tree pollen reads 0.6 (Low) today.

In the Midwest & Great Lakes pattern, the plants that typically shape this city’s year are spring trees, late-spring and summer grasses, and late-summer and autumn ragweed — named here as regional context only, not as today’s readings.

Plant detail returns here automatically on any day the feed includes it.

What this tree pollen level means

Low risk. Keep windows open; consider allergy meds only if sensitive.

Enjoy outdoor activities.

Trees run from March into May, later near the big lakes. This month sits outside the usual tree pollen window for the Midwest & Great Lakes pattern, so today’s tree pollen reading is the modelled value outranking the calendar — this page reports the modelled reading first. The Illinois allergy season guide singles out the classic tree, grass and ragweed sequence at full strength, with mold as a Chicago co-headliner.

Ottawa allergies today

Ottawa allergies today are set by the same reading as the Ottawa pollen count today: the Total Pollen Index is 19 (Low), and the tree pollen index on this page is 0.6 (Low) of it. When people ask about Ottawa allergies, this is the number that answers them — one daily modelled index built from today’s tree, grass and weed index values for Ottawa.

Allergies in Ottawa follow the Illinois calendar set out on the full Ottawa page — the chapters, the plants behind them, and the 5-day forecast show whether today is typical for the season or an exception to it. If you are checking allergies today in Ottawa before heading outdoors, the tree pollen split on this page is the part to read: it shows whether this pollen type is doing the work today, not just how high the total sits.

Read the five-day overall trend above as the Ottawa allergy forecast for the tree pollen season: it shows whether Ottawa allergies are set to ease or build across the week, day by day — the days to plan outdoor time around are the ones where the overall index steps down, not just today.