Ottawa pollen forecast - today, tomorrow and the week ahead

Currently, there is no significant pollen in Ottawa.

On 17 July 2026, pollen conditions in Ottawa will be similar to today with no significant pollen expected.

According to the five-day outlook, artemisia, grass, and ambrosia pollen levels will increase later in the week.

On 16 July 2026, there are no significant pollen types in Ottawa.

Ottawa's position in the St. Lawrence Lowlands, ringed by dense hardwood forest, brings a forceful birch and elm bloom each April, a grassy stretch through the Rideau Valley in June, and a sharp late-summer ragweed spike that builds steadily until the first frost arrives in the region.

The Ottawa pollen forecast is updated four times daily. See the timestamp below for the most recent update.

Studies show that most pollen exposure (often 70–90%) comes from nearby sources, such as local trees and vegetation. A good pollen forecast therefore depends on accurately representing local vegetation. Pollen can travel long distances, but this usually matters only early in the season or during specific wind events.

Pollen data is often misunderstood. Most "pollen levels" are not real-time measurements, but forecasts.

Direct pollen measurements are typically delayed by 1-2 days because they require manual analysis. To show current conditions in Ottawa, modern forecasts combine recent measurements, weather data, and information about local vegetation.

This allows us to estimate pollen levels for today and the coming days, not just report the past.

Airmine’s atmospheric monitoring platform was developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team, using satellite and Earth observation technologies to improve emissions monitoring.