Ottawa pollen forecast — Diefenbunker neighborhood

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, ambrosia and grass pollen levels will increase later in the week.

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

Buried beneath farmland fields west of Ottawa, Diefenbunker experiences a fairly typical eastern Ontario pollen pattern above ground, with surrounding rural land driving a solid spring tree bloom and elevated grass and ragweed exposure from the agricultural fields that surround the underground facility's above-ground entrance and grounds.

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.