Climate shifts are pushing Canada's pollen season earlier and making it more intense. Here is what allergy specialists recommend to protect yourself and your family this spring.
If your eyes started itching and your nose began running earlier than usual this year, you are not imagining it. Allergy specialists across Canada have been tracking a clear trend: the spring pollen season is beginning earlier, lasting longer, and producing higher pollen counts than it did a generation ago.
Research published by Canadian environmental health scientists has found that pollen seasons in major Canadian cities have extended by approximately three weeks over the past three decades. The concentration of pollen in the air has also increased, meaning allergy sufferers are exposed to more pollen for a longer period.
Why Is the Season Getting Longer?
The primary driver is warmer temperatures arriving earlier in the year. Trees rely on temperature cues to begin their pollination cycle. As winters warm and spring arrives sooner, trees like birch, oak, and maple begin releasing pollen weeks earlier than historical averages. A longer growing season also means grasses and ragweed have more time to produce pollen.
Urban heat islands amplify this effect in places like Toronto, Vancouver, Calgary, and Montreal, where the majority of Canadians live.
What Doctors Recommend
Monitor pollen counts. Environment Canada publishes daily pollen counts during the season. On high-count days, limit time outdoors, especially in the morning when pollen levels peak.
Keep windows closed during peak pollen hours. Use air conditioning and replace HEPA filters regularly.
Start antihistamines before symptoms appear. If your allergy season typically begins in March or April, starting a non-drowsy antihistamine a week or two before can help prevent symptoms from taking hold.
Consider nasal corticosteroid sprays. For moderate to severe symptoms, nasal sprays recommended by a doctor are often more effective than antihistamines alone. They work best when used consistently throughout the season.
Explore immunotherapy for long-term relief. Allergy shots or sublingual drops can desensitize the immune system to specific allergens over time, offering lasting relief for many patients.
When to See a Doctor
While many Canadians manage mild seasonal allergies with over-the-counter medications, it is worth speaking to a doctor if your symptoms are significantly affecting your quality of life, interfering with sleep, or not responding well to standard antihistamines. An allergist can develop a targeted treatment plan — and in some cases, identify that what you thought were allergies may be something else entirely.