Seasonal Allergies:
Common Triggers and
Tips to
Manage Them

Enjoy more of the great outdoors by learning about common seasonal allergy triggers and finding out how you can help reduce your exposure to them. Because they change with the seasons, outdoor allergies are often called seasonal allergies. An allergy is a sensitivity of your immune system to something that is ordinarily harmless. Seasonal allergies are caused by an overreaction of the immune system to certain allergens found outside, like those from mould spores and tree, grass or weed pollens.1

While seasonal allergens can be difficult to avoid because it seems like they’re everywhere, there are things you can do to minimize your exposure to them.

Select an Allergy to Learn More:

Pollen Allergies

Mould Allergies

Allergy Symptoms1,2

Blue nose and droplet icon indicates runny nose which is one of the common allergy symptoms.
Blue eye icon indicates itching eyes which is one of the common allergy symptoms.
Blue eye with a tear symbolizes watery eyes which is a common in people suffering from allergies.
Blue nose icon indicates sneezing, which is one of the common allergy symptoms.
Blue nose in green background indicates itchy nose, one of the common allergy symptoms.
Itchy throat is one of the common allergy symptoms.

Allergy testing by an allergist can help assess whether your symptoms are caused by dust mites, pet dander or mould.

Pollen Allergies

Prevention Tips for Pollen Allergy Sufferers

 

Beat the Clock

Pollen counts are typically highest from 5:00 a.m. to 10:00 a.m. and at dusk, so try to plan outside activities for other times of the day.1

Cover Up

Wear an inexpensive painter's mask when you're working in the garden or doing other outside chores.

Make a Change

Pollen spores can hitch a ride on your shoes, clothing and hair and get tracked inside. After spending time outdoors, be sure to remove your shoes, take a quick shower and change your clothes to remove pollen.3

Clear the Air

When driving, keep windows up and set the air conditioner on "recirculate." At home, keep windows closed and use air conditioning. Be sure to change your filters often.3

Branch Out

Looking to plant trees on your property? Avoid hard deciduous trees that can aggravate allergies, including birch, oak, elm, maple, ash, alder and hazel. Instead go with species such as Catalpa, Crepe myrtle, dogwood, fir, or redwood trees.4

Grow Smart

Avoid planting in your yard flowers that are related to ragweed such as sunflowers, daisies and chrysanthemums. If you’re not sure what to plant, ask your local garden centre before you buy4.

Mould Allergies

Tips for Mould Allergy Sufferers

Leave it Outside

Your shoes, clothing and hair can all be magnets for mould spores. Remove your shoes before entering your home and be sure to shower and change clothes right away after spending time outside. If pinched for time, at least wash your hands and face well after coming in.5

Make Friends with the Rake

Mould spores can collect on fallen leaves. So be sure to rake your yard often. Since raking can stir mould spores into the air, wear a mask while tackling this chore. Or, better yet, enlist the help of another member of the family who isn’t allergic to mould.5

Skip the Line

Bedding or clothing hung out to dry on a clothes line may pick up mould spores, along with other allergens. Use a clothes dryer instead.

References

  1. Cleveland Clinic. Environmental Allergies. 2023.
  2. Healthline. What to know about seasonal allergies. 2026.
  3. Mayo Clinic. Seasonal allergies: Nip them in the bud. 2024.
  4. WebMd. Best and Worst Flowers for People With Allergies. 2025.
  5. Asthma and Allergy Foundation of America. (AAFA). Mold Allergy.

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