Pollen Count in Ontario — Today

Updated Friday, November 6, 2026

The Ontario pollen count today spans 41 tracked cities, from Sault Ste. Marie at 5 (Low) up to Ajax at 34 (Low). The allergen doing most of the work across Ontario is Ragweed, the dominant pollen in 31 of its cities.

The Ontario allergy forecast: the five-day outlook for Ajax, today’s highest Ontario city, is easing, and 41 of 41 Ontario cities carry a full five-day trend in the table below. Ontario is tracked as part of North America in the Pollen Atlas region index.

Ontario pollen count today — at a glance

Cities tracked: 41
Highest today: Ajax — 34 (Low)
Lowest today: Sault Ste. Marie — 5 (Low)
Most common dominant allergen: Ragweed — in 31 of 41 cities
Band distribution: Low: 41
Data date: Friday, November 6, 2026

Worst in Ontario today

Ranked by the Total Pollen Index, highest first. Tap a city for its full count, split and forecast.

Every Ontario city — today’s pollen count

City	Today	Dominant	Tree	Grass	Weed
Ajax pollen count · Ajax allergies	34 (Low)	Ragweed	0.6	1	44
Markham pollen count · Markham allergies	33 (Low)	Ragweed	0.6	0.6	43
Pickering pollen count · Pickering allergies	32 (Low)	Ragweed	0.6	1	41
Toronto pollen count · Toronto allergies	31 (Low)	Ragweed	0.6	0.6	40
Norfolk County pollen count · Norfolk County allergies	28 (Low)	Ragweed	0.6	0.6	36
Vaughan pollen count · Vaughan allergies	28 (Low)	Ragweed	0.6	0.6	37
Brantford pollen count · Brantford allergies	27 (Low)	Ragweed	0.6	0.6	35
Burlington pollen count · Burlington allergies	27 (Low)	Ragweed	0.6	0.6	35
Hamilton pollen count · Hamilton allergies	27 (Low)	Ragweed	0.6	0.6	35
Milton pollen count · Milton allergies	27 (Low)	Ragweed	0.6	0.6	35
Mississauga pollen count · Mississauga allergies	27 (Low)	Ragweed	0.6	0.6	35
Oakville pollen count · Oakville allergies	26 (Low)	Ragweed	0.6	0.6	34
Whitchurch-Stouffville pollen count · Whitchurch-Stouffville allergies	26 (Low)	Ragweed	0.6	0.6	34
Caledon pollen count · Caledon allergies	25 (Low)	Ragweed	0.6	0.6	32
Richmond Hill pollen count · Richmond Hill allergies	23 (Low)	Ragweed	0.6	0.6	30
Oshawa pollen count · Oshawa allergies	22 (Low)	Ragweed	0.6	0.6	29
St. Catharines pollen count · St. Catharines allergies	22 (Low)	Ragweed	0.6	1	29
Whitby pollen count · Whitby allergies	22 (Low)	Ragweed	0.6	0.6	29
Kingston pollen count · Kingston allergies	20 (Low)	Ragweed	0.6	0.6	26
Cambridge pollen count · Cambridge allergies	19 (Low)	Ragweed	0.6	0.6	25
Kitchener pollen count · Kitchener allergies	19 (Low)	Ragweed	0.6	0.6	25
Brampton pollen count · Brampton allergies	18 (Low)	Ragweed	0.6	0.6	24
Chatham-Kent pollen count · Chatham-Kent allergies	17 (Low)	Ragweed	0.6	0.6	22
London pollen count · London allergies	17 (Low)	Ragweed	0.6	0.6	22
Aurora pollen count · Aurora allergies	15 (Low)	Ragweed	0.6	0.6	19
Belleville pollen count · Belleville allergies	15 (Low)	Ragweed	0.6	0.6	19
Guelph pollen count · Guelph allergies	15 (Low)	Ragweed	0.6	0.6	19
Newmarket pollen count · Newmarket allergies	15 (Low)	Ragweed	0.6	0.6	19
Niagara Falls pollen count · Niagara Falls allergies	15 (Low)	Ragweed	0.6	0.6	20
Sarnia pollen count · Sarnia allergies	15 (Low)	Ragweed	0.6	0.6	19
Welland pollen count · Welland allergies	14 (Low)	Ragweed	0.6	0.6	18
Thunder Bay pollen count · Thunder Bay allergies	10 (Low)	Grass	0.6	13	0.6
Barrie pollen count · Barrie allergies	5 (Low)	Grass	0.6	0.6	0.6
Clarington pollen count · Clarington allergies	5 (Low)	Grass	0.6	0.6	0.6
Greater Sudbury pollen count · Greater Sudbury allergies	5 (Low)	Grass	0.6	2	0.6
Halton Hills pollen count · Halton Hills allergies	5 (Low)	Grass	0.6	0.6	0.6
Kawartha Lakes pollen count · Kawartha Lakes allergies	5 (Low)	Grass	0.6	0.6	0.6
North Bay pollen count · North Bay allergies	5 (Low)	Grass	0.6	0.6	0.6
Ottawa pollen count · Ottawa allergies	5 (Low)	Grass	0.6	0.6	0.6
Peterborough pollen count · Peterborough allergies	5 (Low)	Grass	0.6	0.6	0.6
Sault Ste. Marie pollen count · Sault Ste. Marie allergies	5 (Low)	Grass	0.6	2	0.6

Pollen counts by state & country

United States

Alabama pollen counts · Alaska pollen counts · Arizona pollen counts · Arkansas pollen counts · California pollen counts · Colorado pollen counts · Connecticut pollen counts · Delaware pollen counts · District of Columbia pollen counts · Florida pollen counts · Georgia pollen counts · Hawaii pollen counts · Idaho pollen counts · Illinois pollen counts · Indiana pollen counts · Iowa pollen counts · Kansas pollen counts · Kentucky pollen counts · Louisiana pollen counts · Maine pollen counts · Maryland pollen counts · Massachusetts pollen counts · Michigan pollen counts · Minnesota pollen counts · Mississippi pollen counts · Missouri pollen counts · Montana pollen counts · Nebraska pollen counts · Nevada pollen counts · New Hampshire pollen counts · New Jersey pollen counts · New Mexico pollen counts · New York pollen counts · North Carolina pollen counts · North Dakota pollen counts · Ohio pollen counts · Oklahoma pollen counts · Oregon pollen counts · PR pollen counts · Pennsylvania pollen counts · Rhode Island pollen counts · South Carolina pollen counts · South Dakota pollen counts · Tennessee pollen counts · Texas pollen counts · Utah pollen counts · Vermont pollen counts · Virginia pollen counts · Washington pollen counts · West Virginia pollen counts · Wisconsin pollen counts · Wyoming pollen counts

Canada

Alberta pollen counts · British Columbia pollen counts · Manitoba pollen counts · New Brunswick pollen counts · Newfoundland and Labrador pollen counts · Nova Scotia pollen counts · Ontario pollen counts · Quebec pollen counts · Saskatchewan pollen counts

Countries worldwide